WO2021090456A1

WO2021090456A1 - Terminal and communication method

Info

Publication number: WO2021090456A1
Application number: PCT/JP2019/043764
Authority: WO
Inventors: 翔平吉岡; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2021-05-14

Abstract

A terminal according to the present invention comprises: a transmission unit that transmits a first signal for reserving resources for sidelink transmission; a reception unit that receives a second signal, which is transmitted from another terminal, for reserving at least a portion of said resources; and a control unit that performs a specific action if the priority level of the second signal is higher than the priority level of the first signal and/or the received power of the second signal is at or above a specified threshold.

Description

Terminal and communication method

The present invention relates to terminals and communication methods in wireless communication systems.

In LTE (Long Term Evolution) and LTE successor systems (for example, LTE-A (LTE Advanced), NR (New Radio) (also called 5G)), terminals such as User Equipment (UE) do not go through a base station. A side link (also called D2D (Device to Device)) technology for direct communication is being studied.

In addition, it is being considered to realize V2X (Vehicle to Everything), and specifications are being promoted. Here, V2X is a part of ITS (Intelligent Transport Systems), and as shown in FIG. 1, V2V (Vehicle to Vehicle), which means a communication mode performed between automobiles, is installed on the side of an automobile and a road. V2I (Vehicle to Vehicle), which means a communication mode between a vehicle and a road-side unit (RSU: Road-Side Unit), and V2N (Vehicle to), which means a communication mode between a car and a driver's mobile terminal. Nomadic device) and V2P (Vehicle to Pedestrian), which means a communication mode between a car and a pedestrian mobile terminal.

A function to perform preemption on the resource for transmitting the side link reserved by the terminal is being studied. In this case, the preemption may mean that another terminal overwrites (preempts) the reservation of the resource by the terminal.

It is necessary to clarify the operation of the terminal when the resource for sending the reserved side link is preempted.

According to one aspect of the present invention, a transmitter that transmits a first signal that reserves a resource for transmission of a side link and a first that reserves at least a part of the resource transmitted from another terminal. When the receiving unit that receives the second signal and the priority of the second signal are higher than the priority of the first signal and / or the received power of the second signal is equal to or higher than a specific value. Provided is a terminal including a control unit that performs a specific operation.

According to the embodiment, it is possible to clarify the operation when the resource for transmitting the reserved side link is preempted.

It is a figure which shows the configuration example of the wireless communication system which concerns on embodiment. It is a figure which shows the outline of SL transmission mode 1 defined by V2X of NR. It is a figure which shows the outline of SL transmission mode 2a. It is a figure which shows the outline of SL transmission mode 2c. It is a figure which shows the outline of SL transmission mode 2d. It is a figure which shows the example of the resource selection method based on the short-term resource reservation. It is a figure which shows the example which the reservation of the resource for transmission of a side link is preempted. It is a figure which shows the example which raises the priority of a reservation signal after the reservation of the resource for transmission of a side link is preempted. It is a figure which shows the example which the reserved resource other than the preempted resource is used as it is without re-reservation. It is a figure which shows an example of the functional structure of the base station which concerns on embodiment. It is a figure which shows an example of the functional structure of the terminal which concerns on embodiment. It is a figure which shows an example of the hardware composition of the base station and the terminal which concerns on embodiment.

Hereinafter, an embodiment of the present invention (the present embodiment) will be described with reference to the drawings. It should be noted that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

The method of direct communication between terminals in the present embodiment is assumed to be LTE or NR side link (SL (Sidelink)), but the method of direct communication is not limited to this method. Further, the name "side link" is an example, and the name "side link" may not be used, and UL (Uplink) may include the function of SL. SL may be distinguished from DL (Downlink) or UL by the difference in frequency or time resource, or may have another name.

Further, UL and SL refer to a time resource, a frequency resource, a time / frequency resource, a reference signal for determining Path loss in transmission power control, and a reference signal (PSS / SSS / PSSS / SSSS) used for synchronization. ) May be distinguished by the difference in any one or a plurality of combinations.

For example, in UL, the reference signal of antenna port X_ANT is used as a reference signal to be referred to for determining Path loss in transmission power control, and in SL (including UL used as SL), Path loss is determined in transmission power control. As the reference signal to be referred to, the reference signal of the antenna port Y_ANT is used.

Further, in the present embodiment, it is mainly assumed that a terminal (which may be called a user device (UE)) is mounted on a vehicle, but the embodiment of the present invention is not limited to this mode. .. For example, the terminal may be a terminal held by a person, the terminal may be a device mounted on a drone or an aircraft, and the terminal may be a base station, an RSU, a relay station (relay node), or a scheduling ability. It may be a user device or the like.

(System configuration)
FIG. 1 is a diagram showing a configuration example of a wireless communication system according to the present embodiment. As shown in FIG. 1, the wireless communication system according to the present embodiment includes a base station 10, a terminal 20A, and a terminal 20B. Although there may actually be a large number of terminals, FIG. 1 shows terminals 20A and terminals 20B as examples.

In FIG. 1, the terminal 20A is intended to be the transmitting side and the terminal 20B is intended to be the receiving side, but both the terminal 20A and the terminal 20B have both a transmitting function and a receiving function. Hereinafter, when the

terminals

20A, 20B and the like are not particularly distinguished, they are simply described as "terminal 20" or "terminal". FIG. 1 shows a case where both the terminal 20A and the terminal 20B are within the coverage as an example, but the operation in the present embodiment is a case where all the terminals 20 are within the coverage and a case where some terminals 20 are within the coverage. It can be applied to both the case where the terminal 20 is in the coverage and the other terminal 20 is out of the coverage, and the case where all the terminals 20 are out of the coverage.

In the present embodiment, the terminal 20 is a device mounted on a vehicle such as an automobile, and has a cellular communication function as a user device (UE) in LTE or NR and a side link function. .. Further, the terminal 20 includes a function of acquiring report information (position, event information, etc.) such as a GPS device, a camera, and various sensors. Further, the terminal 20 may be a general mobile terminal (smartphone or the like). Further, the terminal 20 may be an RSU. The RSU may be a UE type RSU having a UE function, a BS type RSU having a base station function (may be called a gNB type UE), or a relay station.

The terminal 20 does not have to be a device in one housing. For example, even when various sensors are dispersedly arranged in the vehicle, the device including the various sensors is the terminal 20. Further, the terminal 20 may be provided with a function of transmitting and receiving data to and from various sensors without including various sensors.

Further, the processing content of the side link transmission of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR. For example, the terminal 20 scrambles and modulates the code word of the transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. Then, the precoded complex-valued symbols are mapped to the resource element to generate a transmission signal (eg, CP-OFDM, DFT-s-OFDM), which is transmitted from each antenna port.

Further, regarding the base station 10, a function of cellular communication as the base station 10 in LTE or NR, and a function for enabling communication of the terminal 20 in the present embodiment (example: resource pool setting, resource allocation, etc.) )have. Further, the base station 10 may be an RSU (gNB type RSU), a relay station, or a terminal having a scheduling function.

Further, in the wireless communication system according to the present embodiment, the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveform. You may. Further, in the wireless communication system according to the present embodiment, as an example, a frame composed of a plurality of subframes (example: 10 subframes) is formed in the time direction, and a frame composed of a plurality of subcarriers is formed in the frequency direction. Become. One subframe is an example of one transmission time interval (TTI: Transmission Time Interval). However, TTI is not always a subframe. For example, TTI may be a slot or mini-slot or other time domain unit. Further, the number of slots per subframe may be determined according to the subcarrier interval. Further, the number of symbols per slot may be 14 symbols. Further, one symbol may include Cyclic Prefix (CP), which is a guard period for reducing intersymbol interference caused by multipath.

(Overview of NR V2X)
Hereinafter, the outline of the transmission mode defined by V2X of NR will be described with reference to FIGS. 2A to 2D.

FIG. 2A is a diagram showing an outline of SL transmission mode 1 defined by V2X of NR. In SL transmission mode 1, the base station 10 schedules transmission resources and allocates transmission resources to the transmitting terminal 20A. The terminal 20A transmits a signal to the receiving terminal 20B by the allocated transmission resource. The transmission mode may be called a resource allocation mode, or may be called by another name.

2B, 2C, and 2D are diagrams showing an outline of SL transmission mode 2 defined by V2X of NR.

FIG. 2B is a diagram showing an outline of SL transmission mode 2a. In the SL transmission mode 2a, for example, the transmission side terminal 20A autonomously selects a transmission resource and transmits a signal to the reception side terminal 20B by the selected transmission resource.

FIG. 2C is a diagram showing an outline of SL transmission mode 2c. In the SL transmission mode 2c, for example, the base station 10 presets the transmission resource of a fixed cycle / pattern for the terminal 20A (for example, by the parameter of the upper layer), and the terminal 20A is preset. A signal is transmitted to the receiving terminal 20B by a transmission resource having a constant cycle / pattern. Here, instead of the base station 10 presetting the transmission resource of the constant cycle / pattern for the terminal 20A, for example, according to the specifications, the transmission resource of the constant cycle / pattern is set in advance for the terminal 20A. It may have been done.

FIG. 2D is a diagram showing an outline of SL transmission mode 2d. In the SL transmission mode 2d, for example, the terminal 20 performs the same operation as the base station 10. Specifically, the terminal 20 schedules the transmission resource and allocates the transmission resource to the transmission side terminal 20A. The terminal 20A may perform transmission to the receiving terminal 20B by using the allocated communication resource. That is, the terminal 20 may control the transmission of another terminal 20 (for example, the terminal 20A and / or the terminal 20B).

A resource selection method (short term resource reservation based resource selection) based on short-term resource reservation has been proposed for SL transmission mode 2 of NR V2X.

FIG. 3 is a diagram showing an example of a resource selection method based on short-term resource reservation. As shown in the example of FIG. 3, for example, in the terminal 20, when the packet occurs at the timing t1, the terminal 20 selects the transmission resource in the resource selection window [t1 + Δt1, t1 + Δt2]. As shown in the example of FIG. 3, when the timing corresponding to the resource selected for packet transmission is t2, the timing of the resource for transmission of the reservation signal (Reservation Signaling) is t2-k. There may be. The information in the reservation signal may be only the resource reservation information, or may be the resource reservation information and other information (for example, scheduling information, transport block, etc.). Further, in the figure of the present invention, the PSCCH for transmitting the reservation signal and the PSCCH / PSCH for transmitting other information (for example, scheduling information, transport block, etc.) are shown as different channels. The reservation signal and all or part of another signal may be transmitted on the same channel.

In the example of FIG. 3, for example, the transmitting side terminal 20A may transmit the Sidelink Control Information (SCI) as a reservation signal by PSCCH / PSCH, and the receiving side terminal 20B may transmit the reservation signal by PSCCH / PSCH. You may receive it at.

In NR (New Radio) side link mode 2 (NR-SL mode 2), the terminal 20 reserves a resource for future side link transmission based on a certain side link transmission (reservation signal transmission). It is possible.

FIG. 4 is a diagram showing an example in which the terminal 20 reserves a resource for future sidelink transmission based on the transmission of a certain sidelink in NR-SL mode 2. As shown in FIG. 4, for example, terminal 20A reserves the time and frequency resources specified in slot n + 4 and subchannel # b for future sidelink transmission by transmitting the sidelink in slot n. You may.

A function of preempting a resource for transmitting a side link reserved by the terminal 20A is being studied. In this case, the preemption may mean that another terminal 20 overwrites (preempts) the reservation of the resource by the terminal 20A.

As shown in FIG. 4, for example, terminal 20A reserves the time and frequency resources specified in slot n + 4 and subchannel # b for future sidelink transmission by transmitting the sidelink in slot n. Suppose you did. In this case, for example, the terminal 20B may overwrite the reserved resource of the terminal 20A by transmitting the side link in the slot n + 2. For example, the priority of the reservation signal (reservation signal) transmitted by the terminal 20B in the slot n + 2 may be set higher than the priority of the reservation signal transmitted by the terminal 20A in the slot n. Further, for example, when the terminal 20B receives the Reference Signal Received Power (SL-RSRP) of the side link of the reservation signal transmitted in the slot n + 2 at a specific value (for example, the threshold value of the related SL-RSRP) or more. In addition, the terminal 20A may determine that the reservation is overwritten.

As shown in FIG. 4, when the reserved resource is preempted by the terminal 20B, the terminal 20A may select and / or reserve the resource again.

(About issues)
Detailed terminal behavior is not defined for the preemption of the transmission resource of the side link described above. For example, a sidelink transmission resource reserved by one terminal 20 may be repeatedly preempted by another terminal 20. In such a case, the delay may increase for the transmission of the side link by the terminal 20 on the side where the reserved resource is preempted, but a method for avoiding the above repetition is not specified.

Further, for example, it is assumed that a part of the side link transmission resources reserved by the terminal 20 is preempted by another terminal 20. In this case, it is not clearly defined how to handle the remaining resources that are not preempted by the other terminal 20 among the side link transmission resources reserved by the terminal 20.

(Proposal)
A terminal 20 that has reserved a resource for transmission of a side link receives a reservation notification (reservation indication) for the resource from another terminal 20 and / or the notification has a higher priority. A specific operation may be performed when it is associated with the rank and / or the received power (for example, SL-RSRP) of the notification is equal to or more than a specific value.

(Proposal A)
A terminal 20 that has reserved a resource for sending a sidelink is when it receives a notification of the reservation of the resource from another terminal 20 and / or associates the notification with a higher priority. And / or when the received power of the notification is greater than or equal to a certain value, a specific action (from A-1 below) when reserving a resource for transmission of the reselected side link. It may be the operation of at least one of A-4).

(A-1)
The terminal 20 may set the priority of the reservation signal used when reserving the reselected resource, which is a resource for transmitting the side link, to a higher value, for example. For example, the terminal 20 has a priority of the reservation signal used when reserving the reselected resource for transmission of the side link as compared with the priority of the reservation signal used when reserving the preempted resource. The ranking may be set one rank higher.

For example, as shown in FIG. 5, when the terminal 20A transmits a reservation signal (reservation indication) in slot n, it is assumed that the priority of the reservation signal is # x. In this case, it is further assumed that the resource of slot n + 4 reserved by the terminal 20A is preempted by the transmission of the reservation signal in slot n + 2 by the terminal 20B. After that, the terminal 20A transmits a reservation signal in slot n + 6 in order to reserve the reselected resource, which is a resource for transmitting the side link. When transmitting the reservation signal in slot n + 6, the terminal 20A may set the priority of the reservation signal to priority # z, which is a higher priority than priority # x.

(A-2)
The terminal 20 preempts the previous resource reservation in the current resource reservation by, for example, a reservation signal (reservation indication) used when reserving the reselected resource, which is a resource for transmitting the side link. It may be notified that the resource reservation corresponds to the resource reselection due to the fact that the resource has been reselected.

(A-3)
The terminal 20 is, for example, a resource for transmitting a side link, and the reservation signal used when reserving the reselected resource indicates that the resource reservation this time is a resource reservation for which preemption is not allowed. You may notify.

Further, for example, when the current resource reservation is not a resource reservation due to the preemption of the previous resource reservation, the terminal 20 uses a reservation signal used when reserving a resource for transmission of a side link. , The resource reservation this time may notify that the preemption is an acceptable resource reservation.

(A-4)
When a certain resource for transmission of a side link is reserved, the terminal 20 receives a reservation signal of the resource from another terminal 20, and the priority of the notification is set higher than a certain priority. If the notification is received and the received power of the notification is equal to or higher than a certain threshold value, it may be determined that the reservation of the resource has been preempted. Here, when the terminal 20 reserves, for example, a resource for transmitting a side link and a reselected resource, is the received power of the reservation signal from another terminal equal to or higher than a specific value? The threshold value used for determining whether or not to use may be set to a value larger than the threshold value used when the previous resource reservation was preempted. For example, the terminal 20 may increase the threshold by xdB.

(AX)
The terminal 20 may apply any one of the above methods (A-1) to (A-4) after the resource reservation for the transmission of the side link has been preempted N times.

(AY)
The numerical value N in the N times of preemption in the above (AX) may be specified in the specification, for example, may be set (in advance) by the upper layer signaling (for example, RRC signal), and may be set in the side link. It may be set by PC5-RRC, which is RRC signaling, may be specified by Downlink Control Information (DCI), Sidelink Control Information (SCI), or Medium Access Control Control Element (MAC-CE), or may be specified by a terminal. May depend on.

According to each method of Proposal A described above, it is possible to prevent the reservation of the resource for the transmission of the side link by the specific terminal 20 from being repeatedly preempted by the other terminal 20.

(Proposal A')
For example, when a terminal 20 reserves a specific resource for transmission of a side link, it is assumed that the terminal 20 receives a reservation signal (reservation indication) for reserving the reserved specific resource from another terminal 20. You don't have to. Alternatively, terminal 20 receives a notification from another terminal 20 to reserve the reserved particular resource, and / or the notification is associated with a higher priority and / or Even if the received power of the notification is equal to or higher than a specific value, the reserved specific resource may be used as it is. According to the method of Proposal A', it is possible to prevent the resource reserved for important sidelink transmission from being preempted.

(A'-1)
The specific resource described above may be, for example, a resource reserved by pre-reservation.

(A'-2)
The specific resource described above may be, for example, a resource for transmitting a side link and a resource reserved for transmitting a side link in a resource that is not reserved.

(Proposal B)
When the terminal 20 reserves a resource for transmission of the side link, and the resource indicated by the reservation signal from the other terminal 20 is a part of the resource reserved by the terminal 20, the terminal 20 Specific actions may be performed.

(B-1)
When the terminal 20 reserves a resource for transmission of the side link, and the resource indicated by the reservation signal from the other terminal 20 is a part of the resource reserved by the terminal 20, the terminal 20 For example, resources may be reselected for sending sidelinks, as if all reserved resources were preempted.

(B-1-1)
In the case of (B-1) described above, the terminal 20 can use the reserved resources other than the resources notified by the reservation signal from the other terminal 20 as they are without re-reservation. It may be.

FIG. 6 is a diagram showing an example in which, among the resources for transmitting the reserved side link, the reserved resource other than the preempted resource is used as it is without re-reservation. For example, the terminal A reserves a resource in the time domain designated by the slot n + 4 and a resource in the frequency domain designated by the subchannel b and the subchannel c by the reservation signal transmitted in the slot n. In this case, the terminal B uses the reservation signal transmitted in slot n + 2, and among the resources reserved by terminal A, the resource in the time domain is designated in slot n + 4, and the resource in the frequency domain is designated by the subchannel c. Reserve a resource. In this case, among the resources reserved by the terminal A, the resource in the time domain is designated by slot n + 4, and the resource in the frequency domain is designated by the subchannel c is preempted. However, among the resources reserved by the terminal A, the resources in which the time domain resource is designated in slot n + 4 and the frequency domain resource is designated by the subchannel b are not preempted. In this case, the terminal A does not re-reserve the resources reserved by the terminal A for which the time domain resource is designated by slot n + 4 and the frequency domain resource is designated by the subchannel b. It may be possible to use it as it is.

(B-1-2)
In the case of (B-1) described above, the terminal 20 can select / reserve reserved resources other than the resources notified by the reservation signal from the other terminal 20 in the resource reselection. There may be.

(B-1-3)
In the case of (B-1) described above, the terminal 20 excludes reserved resources other than the resources notified by the reservation signal from the other terminal 20 from the candidate resources to be selected in the resource reselection. You may.

(B-2)
When the terminal 20 reserves a resource for transmission of the side link, and the resource indicated by the reservation signal from the other terminal 20 is a part of the resource reserved by the terminal 20, the terminal 20 For example, a reserved resource other than the notified resource may be used without reselecting the resource.

(B-3)
When the terminal 20 reserves a resource for transmission of the side link, when the resource indicated by the reservation signal from the other terminal 20 is a part of the resource reserved by the terminal 20, for example, the resource Whether or not to perform reselection may depend on the implementation of the terminal 20. When the implementation of the terminal 20 is set to reselect resources, the terminal 20 is, for example, any one of (B-1-1) to (B-1-3) described above. One method may be used.

According to each method of Proposal B described above, it is possible to clarify the operation of the terminal 20 with respect to the reserved resource that is not preempted among the resources for transmitting the side link reserved by the terminal 20. When the terminal 20 can use the reserved resource that has not been preempted, it is possible to improve the resource utilization efficiency by the terminal 20. Further, when the terminal 20 cannot use the reserved resource that has not been preempted, the operation of the terminal 20 can be simplified, and the complexity of the implementation of the terminal 20 can be reduced.

(Device configuration)
Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processing operations described so far will be described.

<Base station 10>
FIG. 7 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 7, the base station 10 has a transmission unit 101, a reception unit 102, and a control unit 103. The functional configuration shown in FIG. 7 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the present embodiment can be executed. The transmitter 101 may be referred to as a transmitter, and the receiver 102 may be referred to as a receiver.

The transmission unit 101 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The receiving unit 102 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. In addition, the receiving unit 102 includes a function of measuring the received signal and acquiring a quality value.

The control unit 103 controls the base station 10. The function of the control unit 103 related to transmission may be included in the transmission unit 101, and the function of the control unit 103 related to reception may be included in the reception unit 102.

<Terminal 20>
FIG. 8 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 8, the terminal 20 has a transmission unit 201, a reception unit 202, and a control unit 203. The functional configuration shown in FIG. 8 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the present embodiment can be executed. The transmitter 201 may be referred to as a transmitter, and the receiver 202 may be referred to as a receiver. Further, the terminal 20 may be the terminal 20A on the transmitting side or the terminal 20B on the receiving side. Further, the terminal 20 may be a scheduling terminal 20.

The transmission unit 201 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 202 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. In addition, the receiving unit 202 includes a function of measuring the received signal and acquiring a quality value.

The control unit 203 controls the terminal 20. The function of the control unit 203 related to transmission may be included in the transmission unit 201, and the function of the control unit 203 related to reception may be included in the reception unit 202.

For example, the terminal 20 transmission unit 201 may transmit a reservation signal for reserving a resource for transmission of the side link in slot n + 4 in slot n.

After the transmitting unit 201 of the terminal 20 transmits the reservation signal in the slot n, the receiving unit 202 of the terminal 20 reserves the reserved resource of the terminal 20, and the reservation transmitted in the slot n + 2 by another terminal 20. Upon receiving the signal, the control unit 203 of the terminal 20 may determine that the reserved resource of the terminal 20 has been preempted by another terminal 20.

When the control unit 203 of the terminal 20 determines that the reserved resource of the terminal 20 has been preempted, the control unit 203 may reselect the resource for transmitting the side link.

<Hardware configuration>
The block diagrams (FIGS. 7 to 8) used in the description of the above-described embodiment show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices. Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (constituent unit) for functioning transmission is called a transmitting unit or a transmitter. As described above, the method of realizing each of them is not particularly limited.

Further, for example, the terminal 20 and the base station 10 in one embodiment of the present invention may both function as computers that perform processing according to the present embodiment. FIG. 9 is a diagram showing an example of the hardware configuration of the terminal 20 and the base station 10 according to the present embodiment. The terminal 20 and the base station 10 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the terminal 20 and the base station 10 may be configured to include one or more of the devices shown in 1001 to 1006 shown in the figure, or may be configured not to include some of the devices. May be good.

For each function of the terminal 20 and the base station 10, the processor 1001 performs calculations by loading predetermined software (programs) on hardware such as the processor 1001 and the memory 1002, and controls communication by the communication device 1004. , It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. 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 unit, a register, and the like.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 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 operations described in the above-described embodiment is used. For example, the control unit 203 of the terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks. 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. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.

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

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of.

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

Further, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

In addition, the terminal 20 and the base station 10 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), and FPGA (Field Programmable Gate Array), respectively. It may be configured to include hardware, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Summary of embodiments)
This specification discloses at least the following terminals and communication methods.

A transmitter that transmits a first signal that reserves a resource for sidelink transmission, and a receiver that receives a second signal that reserves at least a portion of the resource transmitted from another terminal. , The control unit that performs a specific operation when the priority of the second signal is higher than the priority of the first signal and / or the received power of the second signal is equal to or higher than a specific value. And a terminal with.

According to the above configuration, it is possible to clarify the operation of the specific terminal when the reservation of the resource for the transmission of the side link by the specific terminal is preempted by the other terminal.

As the specific operation, the control unit may set the priority of the signal for reserving the resource for transmission of the reselected side link to a priority higher than the priority of the first signal. Good.

According to the above configuration, it is possible to prevent a resource reservation for transmission of a side link by a specific terminal from being repeatedly preempted by another terminal.

As the specific operation, the control unit indicates that the signal for reserving the resource for transmission of the reselected side link is a resource reservation associated with the preemption of the resource reservation. Information may be included to indicate that preemption is not allowed.

As the specific operation, the control unit determines whether or not the received power of the signal from the other terminal is the specific value when the received power of the second signal is equal to or higher than the specific value. The threshold value used at the time of determination may be set to a value larger than the threshold value used at the time of determining that the received power of the second signal is equal to or higher than a specific value.

As the specific operation, the control unit uses the second signal when the resource indicated by the second signal received by the receiving unit is a part of the resource reserved by the first signal. Reserved resources other than those shown may be applied for sending sidelinks.

According to the above configuration, it is possible to clarify the operation of the terminal for the reserved resource that is not preempted among the resources for transmitting the side link reserved by the terminal.

A step of transmitting a first signal for reserving a resource for transmission of a side link, a step of receiving a second signal for reserving at least a part of the resource transmitted from another terminal, and the above-mentioned step. A step of performing a specific operation when the priority of the second signal is higher than the priority of the first signal and / or the received power of the second signal is equal to or higher than a specific value. A communication method using a terminal.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed inventions are not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, substitutions, and the like. There will be. Although explanations have been given using specific numerical examples in order to promote understanding of the invention, these numerical values are merely examples and any appropriate value may be used unless otherwise specified. The classification of 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 necessary, and the items described in one item may be used in combination with another item. It may be applied (as long as there is no contradiction) to the matters described in. The boundary of the functional unit or the processing unit in the functional block diagram does not always correspond to the boundary of the physical component. The operation of the 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. Regarding the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of processing description, the terminal 20 and the base station 10 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the terminal 20 according to the embodiment of the present invention and the software operated by the processor of the base station 10 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

The notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using other methods. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize suitable systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station 10 in the present disclosure may be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, various operations performed for communication with a terminal are performed by the base station 10 and other network nodes other than the base station 10 (for example,). , MME, S-GW, etc., but not limited to these). Although the case where there is one network node other than the base station 10 is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

The input / output information and the like may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information and the like can be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website that uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Note that the terms explained in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message.

The terms "system" and "network" used in this disclosure are used interchangeably. In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

In this disclosure, "base station (BS: Base Station)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group" Terms such as "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.

In the present disclosure, terms such as "mobile station (MS: Mobile Station)", "user terminal", "user device (UE: User Equipment)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a terminal, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the user terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, and the like may be read as a side channel.

Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energies having wavelengths in the microwave and light (both visible and invisible) regions.

The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

When used in the present disclosure are "include," "include," and variants thereof, these terms are as comprehensive as the term "comprising." Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

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 the present specification. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.

10 Base station 20 Terminal 101 Transmitter 102 Receiver 103 Control unit 201 Transmitter 202 Receiver 203 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device

Claims

A transmitter that sends the first signal, which reserves resources for the transmission of sidelinks,
A receiver that receives a second signal that reserves at least a portion of the resource transmitted from another terminal.
A control unit that performs a specific operation when the priority of the second signal is higher than the priority of the first signal and / or the received power of the second signal is equal to or higher than a specific value. ,
A terminal equipped with.
As the specific operation, the control unit sets the priority of the signal for reserving the resource for transmission of the reselected side link to a priority higher than the priority of the first signal.
The terminal according to claim 1.
As the specific operation, the control unit indicates that the signal for reserving the resource for transmission of the reselected side link is a resource reservation associated with the preemption of the resource reservation. Include information indicating that preemption is not allowed,
The terminal according to claim 1.
As the specific operation, the control unit determines whether or not the received power of the signal from the other terminal is the specific value when the received power of the second signal is equal to or higher than the specific value. The threshold value used for determination is set to a value larger than the threshold value used when it is determined that the received power of the second signal is equal to or higher than a specific value.
The terminal according to claim 1.
As the specific operation, the control unit uses the second signal when the resource indicated by the second signal received by the receiving unit is a part of the resource reserved by the first signal. Apply reserved resources other than those shown for sending sidelinks,
The terminal according to claim 1.
With the step of sending the first signal, which reserves resources for sending sidelinks,
A step of receiving a second signal that reserves at least a portion of the resource transmitted from another terminal, and
A step of performing a specific operation when the priority of the second signal is higher than the priority of the first signal and / or the received power of the second signal is equal to or higher than a specific value.
A communication method using a terminal.