JP2021106300A - Communication device - Google Patents

Abstract

To enable more flexible resource allocation in device-to-device communication such as V2X communication.SOLUTION: A communication device includes a communication unit that performs wireless communication, an acquisition unit that acquires information on a first range of a resource reserved for another communication device to use some resources for inter-device communication from the other communication device, and a control unit that controls a second range for selecting the resource to be used for the inter-device communication on the basis of the acquired information on the first range.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to communication devices.

In recent years, expectations for in-vehicle communication (V2X communication) have been increasing for the realization of autonomous driving in the future. V2X communication is an abbreviation for Vehicle to X communication, and is a system in which "something" communicates with a car. Examples of "something" here include vehicles, infrastructure, networks, pedestrians, etc. (V2V, V2I, V2N, and V2P). For example, Patent Document 1 discloses an example of a technique related to V2X communication.

In addition, as wireless communication for automobiles, the development of DSRC (Dedicated Short Range Communication) based on 802.11p has been mainly promoted, but in recent years, LTE-based in-vehicle communication "LTE-" has been promoted. The standardization of "based V2X" has been carried out. In LTE-based V2X communication, the exchange of basic safety messages and the like is supported.

Japanese Unexamined Patent Publication No. 2017-2087996

In recent years, 5G technology (NR:) has been aimed at further improving V2X communication.
NR V2X communication using New adio) is being studied. NR V2X communication supports new use cases that require high reliability, low latency, high-speed communication, and high capacity, which could not be supported by LTE-based V2X so far.

On the other hand, as the required specifications are diversified according to the use case, the transmission timing of the packet may vary depending on the jitter component contained in the traffic, and the size of the transmitted packet may vary. The situation can be assumed.

Therefore, the present disclosure proposes a technique that enables more flexible resource allocation in inter-device communication such as V2X communication.

According to the present disclosure, information regarding a communication unit that performs wireless communication and a first range of the resource reserved for the other communication device to use a part of the resource for inter-device communication is provided to the other communication device. Provided by a communication device including an acquisition unit acquired from the device and a control unit that controls a second range for selecting the resource to be used for inter-device communication based on the acquired information on the first range. Will be done.

Further, according to the present disclosure, a communication unit that performs wireless communication, a control unit that controls a first range for reserving the resource in order to use a part of the resource for inter-device communication, and another communication device. Provided by a communication device comprising a notification unit for notifying the other communication device of information regarding the first range in order to control a second range for selecting the resource to be used for the device-to-device communication. Will be done.

Further, according to the present disclosure, according to the communication unit that performs wireless communication, the information about the first resource reserved for use for transmitting the packet in the inter-device communication, and the information about the packet to be transmitted. Therefore, a communication device including a control unit for selecting a second resource different from the first resource is provided.

As described above, according to the present disclosure, there is provided a technique that enables more flexible resource allocation in inter-device communication such as V2X communication.

It should be noted that the above effects are not necessarily limited, and either in combination with or in place of the above effects, any of the effects shown herein, or any other effect that can be grasped from this specification. May be played.

It is explanatory drawing for demonstrating an example of the schematic structure of the system which concerns on one Embodiment of this disclosure. It is a block diagram which shows an example of the structure of the base station which concerns on this embodiment. It is a block diagram which shows an example of the structure of the terminal apparatus which concerns on this embodiment. It is a figure which showed the outline of V2X communication. It is explanatory drawing for demonstrating an example of the whole image of V2X communication. It is a figure which showed an example of the use case of V2X communication. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating the outline about the feature of the packet assumed in NR V2X communication. It is a figure which showed an example of the configuration of the resource allocated to the side link communication. It is explanatory drawing for demonstrating an example of the operation timeline when a terminal apparatus transmits a packet based on Mode4 resource allocation. It is explanatory drawing for demonstrating an example of the sensing operation for selecting a resource from a resource pool. It is explanatory drawing for demonstrating an example of the case where the same resource allocation method as the conventional side link communication is applied to NR V2X communication. It is explanatory drawing for demonstrating the outline of the resource reservation of a Proactive type. It is explanatory drawing for demonstrating the outline about burst resource reservation. It is a figure which showed an example of the case where the range of a reserved resource is divided into a plurality of ranges according to a reservation level. It is explanatory drawing for demonstrating the outline about an example of the determination method of the area which reserves a resource. It is explanatory drawing for demonstrating the outline about another example of the method of determining the area which reserves a resource. It is explanatory drawing for demonstrating the outline about another example of the method of determining the area which reserves a resource. It is explanatory drawing for demonstrating the outline about another example of the method of determining the area which reserves a resource. It is a flowchart which showed an example of the process flow concerning the selection of the resource according to the reservation level. It is a flowchart which showed the other example of the process flow which concerns on the selection of the resource according to the reservation level. It is explanatory drawing for demonstrating the outline about partial resource reservation. It is explanatory drawing for demonstrating the outline about one aspect of partial resource reservation. It is explanatory drawing for demonstrating an example of the operation which concerns on the transmission of a packet when partial resource reservation is applied. It is explanatory drawing for demonstrating an example of the operation which concerns on the transmission of a packet when partial resource reservation is applied. It is explanatory drawing for demonstrating the outline about the operation of the terminal device which performs sensing when the partial resource reservation is applied. It is explanatory drawing for demonstrating the outline about the resource reservation of the Reactive type. It is a block diagram which shows 1st example of the schematic structure of eNB. It is a block diagram which shows the 2nd example of the schematic structure of eNB. It is a block diagram which shows an example of the schematic structure of a smartphone. It is a block diagram which shows an example of the schematic structure of a car navigation device.

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

The explanations will be given in the following order.
1. 1. Configuration example 1.1. An example of system configuration 1.2. Base station configuration example 1.3. Configuration example of terminal device 2. V2X communication 3. Examination of resource allocation in V2X communication 4. Technical features 4.1. Proactive type resource reservation 4.2. Reactive type resource reservation 5. Application example 5.1. Application examples related to base stations 5.2. Application examples related to terminal devices 6. Conclusion

<< 1. Configuration example >>
<1.1. Example of system configuration>
First, with reference to FIG. 1, an example of a schematic configuration of the system 1 according to the embodiment of the present disclosure will be described. FIG. 1 is an explanatory diagram for explaining an example of a schematic configuration of the system 1 according to the embodiment of the present disclosure. As shown in FIG. 1, the system 1 includes a wireless communication device 100 and a terminal device 200. Here, the terminal device 200 is also referred to as a user. The user may also be referred to as a UE. The wireless communication device 100C is also called a UE-Relay. The UE here may be the UE defined in LTE or LTE-A, and the UE-Relay may be the Prose UE to Network Relay discussed in 3GPP, and more generally communicate. It may mean a device.

(1) Wireless communication device 100
The wireless communication device 100 is a device that provides a wireless communication service to a subordinate device. For example, the wireless communication device 100A is a base station of a cellular system (or mobile communication system). The base station 100A performs wireless communication with a device (for example, a terminal device 200A) located inside the cell 10A of the base station 100A. For example, the base station 100A transmits a downlink signal to the terminal device 200A and receives an uplink signal from the terminal device 200A.

The base station 100A is logically connected to another base station by, for example, an X2 interface, and can transmit and receive control information and the like. Further, the base station 100A is logically connected to a so-called core network (not shown) by, for example, an S1 interface, and can transmit and receive control information and the like. Communication between these devices can be physically relayed by various devices.

Here, the wireless communication device 100A shown in FIG. 1 is a macro cell base station, and cell 10A is a macro cell. On the other hand, the wireless communication devices 100B and 100C are master devices that operate the small cells 10B and 10C, respectively. As an example, the master device 100B is a small cell base station that is fixedly installed. The small cell base station 100B establishes a wireless backhaul link with the macro cell base station 100A and an access link with one or more terminal devices (for example, the terminal device 200B) in the small cell 10B. The wireless communication device 100B may be a relay node defined by 3GPP. The master device 100C is a dynamic AP (access point). The dynamic AP100C is a mobile device that dynamically operates the small cell 10C. The dynamic AP100C establishes a wireless backhaul link with the macrocell base station 100A and an access link with one or more terminal devices (eg, terminal device 200C) in the small cell 10C. The dynamic AP100C may be, for example, a terminal device equipped with hardware or software capable of operating as a base station or a wireless access point. The small cell 10C in this case is a dynamically formed localized network (Localized Network / Virtual Cell).

Cell 10A is an arbitrary wireless communication system such as LTE, LTE-A (LTE-Advanced), LTE-ADVANCED PRO, GSM®, UMTS, W-CDMA, CDMA2000, WiMAX, WiMAX2 or 802.16. It may be operated according to.

The small cell is a concept that can include various types of cells smaller than the macro cell (for example, femtocell, nanocell, picocell, microcell, etc.) that are arranged so as to overlap or do not overlap with the macrocell. In one example, the small cell is operated by a dedicated base station. In another example, the small cell is operated by the terminal serving as a master device temporarily operating as a small cell base station. So-called relay nodes can also be considered as a form of small cell base station. A wireless communication device that functions as a master station of a relay node is also called a donor base station. The donor base station may mean DeNB in LTE, or more generally the master station of the relay node.

(2) Terminal device 200
The terminal device 200 can communicate in a cellular system (or mobile communication system). The terminal device 200 performs wireless communication with a wireless communication device of the cellular system (for example, base station 100A, master device 100B or 100C). For example, the terminal device 200A receives the downlink signal from the base station 100A and transmits the uplink signal to the base station 100A.

Further, the terminal device 200 is not limited to the so-called UE, and for example, a so-called low cost terminal (Low cost UE) such as an MTC terminal, an eMTC (Enhanced MTC) terminal, and an NB-IoT terminal may be applied. .. Further, an infrastructure terminal such as an RSU (Road Side Unit) or a terminal such as a CPE (Customer Premises Equipment) may be applied.

(3) Supplement Although the schematic configuration of the system 1 has been shown above, the present technology is not limited to the example shown in FIG. For example, as the configuration of the system 1, a configuration that does not include a master device, SCE (Small Cell Enhancement), HetNet (Heterogeneous Network), an MTC network, or the like can be adopted. Further, as another example of the configuration of the system 1, the master device may be connected to the small cell and the cell may be constructed under the small cell.

<1.2. Base station configuration example>
Next, the configuration of the base station 100 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the configuration of the base station 100 according to the embodiment of the present disclosure. Referring to FIG. 2, the base station 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140, and a control unit 150.

(1) Antenna unit 110
The antenna unit 110 radiates the signal output by the wireless communication unit 120 into space as a radio wave. Further, the antenna unit 110 converts a radio wave in space into a signal and outputs the signal to the wireless communication unit 120.

(2) Wireless communication unit 120
The wireless communication unit 120 transmits and receives signals. For example, the wireless communication unit 120 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.

(3) Network communication unit 130
The network communication unit 130 transmits / receives information. For example, the network communication unit 130 transmits information to another node and receives information from the other node. For example, the other nodes include other base stations and core network nodes.

As described above, in the system 1 according to the present embodiment, the terminal device may operate as a relay terminal and relay the communication between the remote terminal and the base station. In such a case, for example, the wireless communication device 100C corresponding to the relay terminal may not include the network communication unit 130.

(4) Storage unit 140
The storage unit 140 temporarily or permanently stores the program and various data for the operation of the base station 100.

(5) Control unit 150
The control unit 150 provides various functions of the base station 100. The control unit 150 includes a communication processing unit 151, an information acquisition unit 153, and a notification unit 155. The control unit 150 may further include other components other than these components. That is, the control unit 150 can perform operations other than the operations of these components.

The communication processing unit 151 executes various processes related to the control of wireless communication with the terminal device 200 via the wireless communication unit 120. In addition, the communication processing unit 151 executes various processes related to the control of communication with other nodes (for example, other base stations, core network nodes, etc.) via the network communication unit 130.

The information acquisition unit 153 acquires various information from the terminal device 200 and other nodes. The acquired information may be used, for example, for control of wireless communication with a terminal device, control for cooperation with other nodes, and the like.

The notification unit 155 notifies the terminal device 200 and other nodes of various information. As a specific example, the notification unit 155 may notify the terminal device of various information for the terminal device in the cell to perform wireless communication with the base station. Further, as another example, the notification unit 155 may notify another node (for example, another base station) of the information acquired from the terminal device in the cell.

<1.3. Terminal device configuration example>
Next, an example of the configuration of the terminal device 200 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the configuration of the terminal device 200 according to the embodiment of the present disclosure. As shown in FIG. 3, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, and a control unit 240.

(1) Antenna unit 210
The antenna unit 210 radiates the signal output by the wireless communication unit 220 into space as a radio wave. Further, the antenna unit 210 converts a radio wave in space into a signal and outputs the signal to the wireless communication unit 220.

(2) Wireless communication unit 220
The wireless communication unit 220 transmits and receives signals. For example, the wireless communication unit 220 receives the downlink signal from the base station and transmits the uplink signal to the base station.

Further, in the system 1 according to the present embodiment, the terminal device 200 may directly communicate with another terminal device 200 without going through the base station 100. In this case, the wireless communication unit 220 may transmit and receive a side link signal to and from another terminal device 200.

(3) Storage unit 230
The storage unit 230 temporarily or permanently stores the program and various data for the operation of the terminal device 200.

(4) Control unit 240
The control unit 240 provides various functions of the terminal device 200. For example, the control unit 240 includes a communication processing unit 241, an information acquisition unit 243, a determination unit 245, and a notification unit 247. The control unit 240 may further include other components other than these components. That is, the control unit 240 may perform operations other than the operations of these components.

The communication processing unit 241 executes various processes related to the control of wireless communication with the base station 100 and other terminal devices 200 via the wireless communication unit 220. For example, the communication processing unit 241 may reserve a resource to be used for transmitting a packet. At this time, the communication processing unit 241 may control the range in which the resource is reserved based on a predetermined condition. Further, the communication processing unit 241 may select a part of the reserved resources and control the packet to be transmitted using the selected resources.

The information acquisition unit 243 acquires various information from the base station 100 and other terminal devices 200. As a specific example, the information acquisition unit 243 may acquire various information for selecting resources to be used for communication with the other terminal device 200 from the base station 100 or the other terminal device 200. As a more specific example, the information acquisition unit 243 may acquire information about resources reserved by the other terminal device 200 from the other terminal device 200.

The determination unit 245 executes processing related to various determinations. For example, the determination unit 245 may make a predetermined determination based on the information acquired from the base station 100 or another terminal device 200. As a more specific example, the determination unit 245 may make a determination regarding the selection of the resource to be used for transmitting the packet based on the information about the resource reserved by the other terminal device 200. Further, as another example, the determination unit 245 may determine the reservation of the resource used for transmitting the packet based on various conditions.

The notification unit 247 notifies the base station 100 and other terminal devices 200 of various information. As a specific example, other terminal devices 200 may be notified of information about resources reserved for use in transmitting packets.

<< 2. V2X communication >>
Subsequently, the outline of V2X communication will be described. V2X communication is an abbreviation for Vehicle to X communication, and is a system in which "something" communicates with a car. For example, FIG. 4 is a diagram showing an outline of V2X communication. Examples of "something" here include vehicles (Vehicle), equipment (Infrastructure), networks (Network), pedestrians (Pedestrian), and the like (V2V, V2I), as shown in FIG. , V2N, and V2P).

(Overview of V2X communication)
Further, FIG. 5 is an explanatory diagram for explaining an example of the overall image of V2X communication. In the example shown in FIG. 5, a V2X application server (APP server) is held as a cloud server, and the application server controls V2X communication on the core network side. The base station performs Uu-link communication with the terminal device, while performing communication control of direct communication such as V2V communication and V2P communication. In addition to the base station, an RSU (Road Side Unit) is arranged as a roadside infrastructure. There are two possible RSUs, a base station type RSU and a UE type RSU. In RSU, V2X application (V2X APP) is provided and support such as data relay is provided.

(V2X communication use case)
As wireless communication for automobiles, the development of DSRC (Dedicated Short Range Communication) based on 802.11p has been mainly promoted, but in recent years, LTE-based in-vehicle communication "LTE-based V2X" has been promoted. (LTE-based V2X communication) ”has been standardized. In LTE-based V2X communication, the exchange of basic safety messages and the like is supported. On the other hand, with the aim of further improving V2X communication, NR V2X communication using 5G technology (NR: New Radio) has been studied in recent years. For example, FIG. 6 is a diagram showing an example of a use case of V2X communication.

NR V2X communication supports new use cases that require high reliability, low latency, high speed communication, and high capacity, which were previously difficult to support with LTE-based V2X. As a specific example, among the examples shown in FIG. 6, for example, provision of a dynamic map, remote driving, and the like can be mentioned. In addition to this, there are sensor data sharing in which sensor data is exchanged between vehicles and road vehicles, and plateoning use cases for platooning. Use cases and requirements for such NR V2X communication are specified in 3GPP TR22.886. For reference, an outline of an example of a use case will be described below.

(1) Vehicles Platoonning
This is a use case of platooning in which a plurality of vehicles form a platoon and travel in the same direction, and information is exchanged between the vehicle leading the platooning and another vehicle to control the platooning. By exchanging such information, for example, it becomes possible to further reduce the inter-vehicle distance of platooning.

(2) Extended Sensors
This is a use case in which sensor-related information (raw data before data processing and data after processing) can be exchanged between vehicles. Sensor information is collected through local sensors, live video images (eg, live video images between surrounding vehicles, RSUs, and pedestrians), V2X application servers, and the like. By exchanging these information, the vehicle can obtain information that cannot be obtained by its own sensor information, and can recognize / recognize a wider range of environments. In this use case, since it is necessary to exchange a lot of information, a high data rate is required for communication.

(3) Advanced Driving
This is a use case that enables semi-automatic driving and fully automatic driving. In this use case, the RSU shares the cognitive / recognition information obtained from its own sensors, etc. with the surrounding vehicles, so that each vehicle adjusts the track and operation in synchronization with and cooperates with other vehicles. Can be done. In addition, each vehicle can share the intention and intention of driving with neighboring vehicles.

(4) Remote Driving
This is a use case for remote control and V2X applications. Remote control is used when another person drives in place of a person who has difficulty driving, or when operating a vehicle in a dangerous area. For public transportation, for example, cloud computing-based maneuvers can be applied to public transportation where the route and the road to be traveled are fixed to some extent. In this use case, communication is required to have high reliability and low transmission delay.

(Physical layer enhancement)
Further enhancement of the physical layer from LTE V2X is required to achieve the above requirements. Target links include Uu links and PC5 links (side links). A Uu link is a link between an infrastructure such as a base station or RSU (Road Side Unit) and a terminal device. The PC5 link (side link) is a link between terminal devices. The main points of enhancement are shown below.

Examples of enhancements include:
・ Channel format ・ Side link feedback communication ・ Side link resource allocation method ・ Vehicle position information estimation technology ・ Terminal-to-terminal relay communication ・ Unicast communication, multicast communication support ・ Multicarrier communication, carrier aggregation ・ MIMO / beamforming ・ High frequency frequency support (Example: 6 GHz or higher)
…etc

Examples of the channel format include Flexible numerology, short TTI (Transmission Time Interval), multi-antenna support, and Waveform. Further, examples of the side link feedback communication include HARQ, CSI (Channel Status Information) and the like.

(V2X operation scenario)
An example of the V2X communication operation scenario will be described below. In V2N communication, only DL / UL communication between the base station and the terminal device was simple. On the other hand, in V2V communication, various communication paths can be considered. In the following, each scenario will be described mainly focusing on the example of V2V communication, but the same communication operation can be applied to V2P and V2I. In V2P and V2I, the communication destination is Pedestrian or RSU.

For example, FIGS. 7 to 12 are explanatory diagrams for explaining an example of a V2X operation scenario. Specifically, FIG. 7 shows a scenario in which vehicles directly communicate with each other without going through a base station (E-UTRAN). FIG. 8 shows a scenario in which vehicles communicate with each other via a base station. 9 and 10 show a scenario in which vehicles communicate with each other via a terminal device (UE, here RSU) and a base station. 11 and 12 show a scenario in which vehicles communicate with each other via a terminal device (UE, in this case RSU or another vehicle).

In addition, in FIGS. 7 to 12, the "side link" corresponds to a communication link between terminal devices and is also referred to as PC5. Specific examples of side links include V2V, V2P, and V2I communication links. The "Uu interface" corresponds to a wireless interface between a terminal device and a base station. A specific example of the Uu interface is a V2N communication link. The "PC5 interface" corresponds to a wireless interface between terminal devices.

<< 3. Examination of resource allocation in V2X communication >>
In this disclosure, attention is paid to a resource allocation method of a V2V communication link in NR V2X communication. In conventional side-link communication (particularly V2V), periodic traffic such as periodically broadcasting a safety message to surrounding vehicles has been assumed.

On the other hand, NR V2X is expected to support new use cases such as "Sensor data sharing" and "Advanced driving", and it is possible that the periodicity of traffic will be disrupted. That is, although it is a periodic traffic, it is expected that the traffic contains a jitter component and the timing of the arrival of the packet in the physical layer (that is, the arrival of the packet from the upper layer to the physical layer) is slightly deviated.

As for the packet size, packets of the same size have been mainly assumed in the past, but in a new use case, traffic whose size changes for each packet can be assumed. Such a change in packet size is caused by, for example, that the transmitted data depends on the surrounding environment of the automobile.

For example, FIG. 13 is an explanatory diagram for explaining an outline of the characteristics of packets assumed in NR V2X communication, and schematically shows the difference in traffic between NR V2X communication and conventional side link communication. There is. The upper diagram of FIG. 13 shows an example of the traffic assumed in the conventional side link communication. That is, in the conventional side link communication, it is assumed that the arrival cycle T of the packet from the upper layer to the physical layer and the packet size P of the packet are always constant. On the other hand, the lower figure of FIG. 13 shows an example of the traffic assumed in NR V2X communication. That is, in the NR V2X communication, it is necessary to consider the jitter component α of the arrival cycle T of the packet from the upper layer to the physical layer and the fluctuation component β of the packet size P. Against this background, in NR V2X communication, side-link communication is performed in a more preferable manner even in a situation where the influence of the jitter component α of the packet arrival cycle T and the fluctuation component β of the packet size P becomes apparent. Resource management is required to enable this.

(Existing side link resource allocation method)
Here, the outline of the resource allocation method to the side link will be described. As the method of resource allocation to the side link, the method of "Mode 3 resource allocation" in which the base station allocates the resource of the side link and the method of "Mode 4 resource allocation" in which the terminal device itself senses and selects the resource of the side link. There is. This disclosure mainly focuses on the mode4 resource allocation method.

-Resource pool allocation
Mode4 When allocating resources, the resource pool is allocated in advance. The allocation of the resource pool is performed by, for example, a base station. Further, as another example, the resource pool may be allocated by Preconfiguration. The terminal device senses resources for side-link communication from the allocated resource pool, selects an appropriate resource by itself, and communicates.

For example, FIG. 14 is a diagram showing an example of the configuration of resources (resource pools) allocated to side link communication, and shows an example of a case where frequency division multiplexing (FDM) is applied. .. As shown in FIG. 14, the resource pool is divided into an SA (Scheduling Assignment) area and a Data area, and PSCCH (Physical Sidelink Control Channel) and PSCH (Physical Sidelink Shared Channel) are transmitted by each area. In the following, the description will be focused on the case where FDM is applied as shown in FIG. 14, but the application destination of the technology according to the present disclosure is not necessarily limited. As a specific example, even when time division multiplexing (TDM) is applied, it is possible to apply the technique according to the present disclosure described below. When TDM is applied, the SA region and the Data region are orthogonal to each other on the time axis.

-Mode4 resource allocation The outline of Mode4 resource allocation will be described with reference to FIG. FIG. 15 is an explanatory diagram for explaining an example of an operation timeline when the terminal device transmits a packet based on the Mode4 resource allocation. As shown in FIG. 15, the terminal device that transmits a packet first performs sensing in order to discover a resource used for transmitting the packet from the resource pool. Next, the terminal device selects a resource from the resource pool based on the result of the sensing. Then, the terminal device transmits the packet using the selected resource. Further, at this time, the terminal device reserves a resource to be used for subsequent packet transmission, if necessary.

Here, an example of the above sensing operation will be described with reference to FIG. FIG. 16 is an explanatory diagram for explaining an example of a sensing operation for selecting a resource from the resource pool.

Specifically, the terminal device selects a resource in the resource selection window and reserves a future resource based on the measurement result of the interference pattern in the sensing window and the resource reservation status in the sensing window. As a specific example, in the example shown in FIG. 16, when the packet D to be transmitted is generated, the terminal device uses the future resource usage status, for example, another packet in the future, based on the sensing result. Predict the resources used to transmit A to C. By using the result of the prediction, the terminal device can select and reserve a resource that can be used for transmitting the packet D, that is, a resource that is predicted not to be used for transmitting another packet.

(Technical issues)
As described above, in the conventional side link communication, the packet cycle and the packet size are fixed, so that the terminal device does not need to consider the jitter and the change in the packet size when making a reservation after selecting the resource. rice field. That is, in the conventional side link communication, it is sufficient to reserve the resource on the premise that the resource having the same size as the conventional one is transmitted after the packet arrival cycle T has elapsed.

On the other hand, in NR V2X communication, it is necessary to consider the influence of the jitter component α of the packet arrival cycle T and the fluctuation component β of the packet size P, and the same resource allocation method as in the conventional side link communication is applied. Can be difficult.

For example, FIG. 17 is an explanatory diagram for explaining an example in which a resource allocation method similar to that of the conventional side link communication is applied to NR V2X communication. As shown in FIG. 17, when resource allocation is performed as in the conventional side link communication, it becomes difficult to satisfy the latency requirement when jitter occurs in the packet arrival cycle T. In some cases. Further, when the packet size P changes, problems such as resource shortage and over-reservation of resources may occur.

In view of the above circumstances, the present disclosure proposes a technique that enables more flexible resource allocation in inter-device communication such as V2X communication. Specifically, the present disclosure proposes a technique for allocating resources to side links that can more flexibly respond to changes in packet arrival cycle T jitter and packet size P.

<< 4. Technical features >>
Next, as a technical feature of the system according to the present disclosure, an example of a technique related to resource allocation to a side link that can more flexibly respond to a change in the packet arrival cycle T and a change in the packet size P will be described. explain. Specifically, as an example of the technology for carrying out resource reservation (resource reservation), the following two approaches will be described respectively.
・ Proactive type resource reservation ・ Reactive type resource reservation

<4.1. Proactive type resource reservation>
First, as a Proactive type resource reservation, an example of a method of reserving resources in advance in consideration of the jitter of the packet arrival cycle T and the change of the packet size P will be described.

For example, FIG. 18 is an explanatory diagram for explaining an outline of a Proactive type resource reservation. As shown in FIG. 18, in the Proactive type resource reservation, the terminal device reserves a resource in consideration of the jitter component α of the packet arrival cycle T and the fluctuation component β of the packet size P (hereinafter, “” Controls the range of reserved resources). Specifically, the terminal device has a range in the time axis direction of the reserved resource so that the timing shift of the arrival of the packet, that is, the jitter component α (α_min <α <α_max) of the arrival cycle T of the packet is allowed. Is controlled to be wider. Further, the terminal device has a reserved resource size (in other words, a range of allowable reserved resource size) so that a change in packet size P (P_min <P <P_max) according to the fluctuation component β is allowed. To control. Therefore, in the following description, when the term "reserved resource range" is described, unless otherwise specified, the range of the reserved resource in the time axis direction and the allowable range of the reserved resource size are defined. Both may be included. The range of reserved resources corresponds to an example of the "first range".

On the other hand, in this method, the wider the range of reserved resources, the more limited the resources that can be used by other terminal devices located in the vicinity. In other words, the range in which other terminal devices can select resources is limited according to the range of reserved resources. Therefore, in this method, it is desirable that the range of reserved resources is set more appropriately due to the existence of such trade-offs. The range in which the other terminal device selects the resource corresponds to an example of the "second range".

Based on the above, as details of the Proactive type resource reservation, a method of setting a reserved resource by a terminal device for making a reservation and a method of selecting a resource by another terminal device based on the setting of the reserved resource will be described. Two types of reserved resource setting methods, a method called "burst resource reservation" and a method called "partial resource reservation", will be described. Further, in the following description, for convenience, a terminal device for reserving resources is also referred to as a "first terminal device", and a terminal device for selecting a resource based on the reservation is also referred to as a "second terminal device". On the other hand, when the "first terminal device" and the "second terminal device" are not particularly distinguished, they are also simply referred to as "terminal devices".

(Burst resource reservation)
First, burst resource reservation will be described. For example, FIG. 19 is an explanatory diagram for explaining an outline of burst resource reservation. As shown in FIG. 19, in the burst resource reservation, the first terminal device that makes a reservation secures a continuous range in the time direction and the frequency direction in which packets may be transmitted thereafter as the range of the reserved resource. Make a resource reservation so that it is done. At this time, the range of the reserved resource is controlled according to the range of the assumed jitter component α (α_min <α <α_max) and the range of the assumed packet size P (P_min <P <P_max). Based on such control, the first terminal device selects a part of the resources included in the reserved resource range and uses it for packet transmission. That is, basically, the first terminal device can freely transmit a packet as long as it is within the range of the reserved reserved resource.

The range of reserved resources can be controlled based on various conditions. For example, the range of the reserved resource may be determined according to the jitter component α and the fluctuation component β of the packet size P. More specifically, the range of reserved resources may be determined by combining one or more of the following conditions.
・ Minimum value α_min and maximum value α_max of jitter component α
-Average and variance value of jitter component α-Minimum value β_min and maximum value β_max of packet size fluctuation component β
・ Average and variance value of packet size fluctuation component β

Further, as another example, the range of the reserved resource may be determined according to the CBR (Channel Busy Ratio) measured in the frequency band used. As a more specific example, when the CBR is lower than the threshold value (non-congestion situation), the range of the reserved resource is controlled to be wider, and when the CBR is higher than the threshold value (congestion situation), the reserved resource is reserved. It is preferable that the range of is controlled so as to be more limited.

Further, as another example, the range of the reserved resource may be determined according to the priority of the packet. As a more specific example, it is preferable that the range of reserved resources is controlled to be wider for packets with high priority, and the range of reserved resources is controlled to be more limited for packets with low priority. ..

Further, as another example, the range of reserved resources may be determined according to the type of operation service such as "Sensor data sharing" or "Automated driving". In this case, the first terminal device sets the range of reserved resources based on information (for example, a table) that defines how wide the range of reserved resources should be secured for each service type. You just have to decide. The information may be preconfigured in the terminal device or may be provided from the base station to the terminal device.

Further, as another example, the range of the reserved resource may be determined according to the packet type information such as eMBB (enhanced Mobile Broadband) and URLLC (Ultra Reliable Low Latency Communication). In this case, the first terminal device has a range of reserved resources based on information (for example, a table) that defines how wide the range of reserved resources should be secured for each packet type. Should be decided. The information may be preconfigured in the terminal device or may be provided from the base station to the terminal device.

Further, as another example, the range of the reserved resource may be determined according to the position information of the terminal device. As a more specific example, when an automobile (equivalent to a terminal device) is running on a highway, the jitter may be smaller, so that the range of reserved resources may be controlled to be limited. .. Further, in a situation where an automobile (corresponding to a terminal device) is traveling around an intersection, jitter may become larger, so that the range of reserved resources may be controlled to be wider. In this case, the first terminal device sets the range of the reserved resource based on the information (for example, a table) that defines how wide the range of the reserved resource should be secured for each position information. You just have to decide. The information may be preconfigured in the terminal device or may be provided from the base station to the terminal device.

Further, the range of the reserved resource may be set to include a plurality of partial ranges in which different levels are set among the plurality of levels. Hereinafter, the level set in the partial range is also referred to as a “reservation level”. In other words, the range of reserved resources may be divided into a plurality of partial ranges according to the reservation level. Further, the partial range according to the reservation level is also simply referred to as "the range according to the reservation level". The range corresponding to the reservation level corresponds to an example of the "third range".

For example, FIG. 20 is a diagram showing an example in which the range of the reserved resource is divided into a plurality of ranges according to the reservation level. Specifically, in the example shown in FIG. 20, the reservation level (that is, reservation levels 1 to 3) is set according to the average and the variance value of the probability density function of the jitter component, and the range of the reservation resource is set to the reservation level. An example is shown in the case of being divided into a plurality of corresponding ranges (that is, ranges corresponding to each of the reservation levels 1 to 3). In the example shown in FIG. 20, the range in which the reservation level 1 is set corresponds to the range in which the packet is likely to be transmitted. On the other hand, the range in which the reservation level 3 is set corresponds to the range in which the possibility that the packet is transmitted is low.

For information on the conditions for dividing the range of reserved resources into a plurality of ranges according to the reservation level (for example, the number of divisions, the division size, the upper limit of the number of divisions, the upper limit of the division size, etc.), the terminal from the base station The device may be notified in advance or may be determined by the terminal device itself.

Further, depending on the reservation level, conditions (constraints) regarding the use of the range corresponding to the reservation level may be individually set. As a specific example, depending on the reservation level, conditions may be set so that the use of the range according to the reservation level is classified into exclusive use (Exclusive) and inclusive use (Inclusive). .. Specifically, when exclusive use is set for the reservation level, the range corresponding to the reservation level is used exclusively by the first terminal device that made the reservation. The conditions of use of the range are limited. On the other hand, when comprehensive use is set for the reservation level, the range corresponding to the reservation level is the other terminal device (that is, even when the reservation is made by a certain first terminal device). , The usage conditions of the range are relaxed so that the overlap of the range in which the resources can be selected by the second terminal device) is allowed. For example, Table 1 below is an example of the correspondence between the reservation level and the classification of the reservation level.

The first terminal device that has reserved the resource sets the reservation level for the use of the reserved resource range (that is, the selection of the resource from the range) (that is, the reserved resource range). Is divided into ranges according to the reservation level), the second terminal device may be notified of information regarding the range according to the reservation level. In the following, for convenience, the information regarding the range corresponding to the reservation level will also be referred to as "reservation level information". Further, in this case, the first terminal device that has reserved the resource may notify the second terminal device of the reservation level information by using, for example, SCI (Sidelink Control Information). That is, in this case, the first terminal device that has reserved the resource secondly obtains the information regarding the reserved resource range secured and the reservation level information according to the reservation level set for the use of the range. You may notify the terminal device of.

An example of a method in which the first terminal device sets a range according to the reservation level will be described. For example, the first terminal device may set a range according to the reservation level by dividing at least a part of the reserved resource range reserved based on the conditions instructed in advance by the base station. For example, Table 2 below shows an example of conditions for setting a range according to the reservation level.

For example, when the base station notifies the information (for example, a table) in which the conditions specified in Table 2 are specified, the first terminal device transmits the information of the packet to be transmitted (for example, the amount of jitter of the packet, etc.). The range according to the reservation level may be set by comparing the fluctuation amount of the packet size, etc. with the relevant conditions.

Further, the information regarding the conditions for setting the range according to the reservation level (for example, the conditions shown in Table 2) may be preconfigured in the terminal device.

Subsequently, an example of a method for determining an area for reserving a resource (that is, a range of reserved resources) will be described below together with a method for notifying information about the area according to the determination method.

For example, FIG. 21 is an explanatory diagram for explaining an outline of an example of a method for determining an area for which a resource is reserved. In the example shown in FIG. 21, a region for reserving resources (that is, a range of reserved resources) is set as a region in the frequency direction and a time direction, and a part of the region is a partial region (that is, that is, a region corresponding to the reservation level). It is set as a range according to the reservation level). In FIG. 21, “Start SF” and “End SF” correspond to the start position and the end position in the time direction of the range of the reserved resource. Further, "Start PRB" and "End PRB" correspond to the start position and the end position in the frequency direction of the range of the reserved resource. Further, "Start SF_Li" and "End SF_Li" correspond to the start position and the end position in the time direction in the range corresponding to the reservation level i (i = 1, 2, ..., Max_level). As a specific example, "Start SF_L1" and "End SF_L1" correspond to the start position and the end position in the time direction in the range corresponding to the reservation level 1. Further, "Start PRB_Li" and "End PRB_Li" correspond to the start position and the end position in the frequency direction in the range corresponding to the reservation level i. As a specific example, "Start PRB_L1" and "End PRB_L1" correspond to the start position and the end position in the frequency direction in the range corresponding to the reservation level i.

In the case of the example shown in FIG. 21, the first terminal device notifies the second terminal device of information for specifying the target range as information regarding the range of the reserved resource and the range according to the reservation level. You may.

For example, the first terminal device may notify the second terminal device of the start position and the end position of the range in each of the time direction and the frequency direction as information for specifying the target range. As a specific example, the first terminal device has "Start SF_Li", "End SF_Li", and "End SF_Li" as information for specifying the range corresponding to the reservation level i (i = 1, 2, ..., Max_level). "Start PRB_Li" and "End PRB_Li" may be notified to the second terminal device.

Further, as another example, the first terminal device sets the start position of the range and the width of the range in the time direction and the frequency direction as information for specifying the target range as the second terminal. The device may be notified. For example, the width in the time direction (in other words, the number of resources) of the range corresponding to the reservation level i (i = 1, 2, ..., Max_level) is set to "number SF_Li", and the width in the frequency direction of the range (in other words, in other words). , Number of resources) is "number PRB_Li". In this case, the first terminal device uses "Start SF_Li", "number SF_Li", "Start PRB_Li", and "number PRB_Li" as information for specifying the range corresponding to the reservation level i. You may notify the terminal device of.

Further, FIG. 22 is an explanatory diagram for explaining an outline of another example of a method for determining an area for which a resource is reserved. In the example shown in FIG. 22, the area for reserving resources (that is, the range of reserved resources) is divided into a plurality of subregions in the time direction. In FIG. 22, “SF1”, “SF2”, ..., “SFn” are information regarding the first, second, ..., Nth subregions among the plurality of subregions in which the range of the reserved resource is divided in the time direction. Is shown. As a specific example, "SFi" corresponds to information about the i-th subregion, such as the time-wise start position (Start SF_Li) and end position (End SF_Li) of the subregion. It may contain information to identify the area.

In the example shown in FIG. 22, the first terminal device may notify the second terminal device of information regarding a partial area in which the range of the reserved resource is divided in the time direction. As a specific example, the first terminal device uses "SFi" as the time direction information regarding the i-th subregion among the subregions in which the reserved resource range is divided in the time direction as the second terminal device. May be notified to. In this case, as for the frequency direction information, the frequency direction information (for example, "Start PRB" and "End PRB") for specifying the range of the reserved resource may be notified.

Further, FIG. 23 is an explanatory diagram for explaining an outline of another example of the method of determining the area for which the resource is reserved. In the example shown in FIG. 23, the region for reserving resources (that is, the range of reserved resources) is divided into a plurality of subregions in the frequency direction. In FIG. 23, “PRB1”, “PRB2”, ..., “PRBn” are information regarding the first, second, ..., Nth subregions among a plurality of subregions in which the reserved resource range is divided in the frequency direction. Is shown. As a specific example, "PRBi" corresponds to information about the i-th subregion, such as the start position (Start PRB_Li) and end position (End PRB_Li) in the frequency direction of the subregion. It may contain information to identify the area.

In the example shown in FIG. 23, the first terminal device may notify the second terminal device of information regarding a partial region in which the range of reserved resources is divided in the frequency direction. As a specific example, the first terminal device uses "PRBi" as the second terminal device as frequency direction information regarding the i-th subregion among the subregions in which the reserved resource range is divided in the frequency direction. May be notified to. In this case, as for the information in the time direction, the information in the time direction for specifying the range of the reserved resource (for example, "Start SF" and "End SF") may be notified.

In the example shown in FIG. 23, the size of each partial region in which the reserved resource range is divided in the frequency direction may be different in the frequency direction. Further, a part of the subregion may be included in the other subregion.

Further, FIG. 24 is an explanatory diagram for explaining an outline of another example of a method for determining an area for which a resource is reserved. In the example shown in FIG. 24, the area for reserving resources (that is, the range of reserved resources) is divided into a plurality of subregions in both the time direction and the frequency direction. In FIG. 24, “SF1”, “SF2”, ..., “SFn” are the same as “SF1”, “SF2”, ..., “SFn” in the example shown in FIG. Further, in FIG. 24, "PRB1", "PRB2", ..., "PRBn" are the same as "PRB1", "PRB2", ..., "PRBn" in the example shown in FIG. 23.

In the example shown in FIG. 24, the first terminal device may notify the second terminal device of information regarding a partial region in which the range of the reserved resource is divided in the time direction and the frequency direction. As a specific example, the first terminal device uses "SFi" as the information regarding the i-th located subregion in the time direction among the information of the subregions in which the reserved resource range is divided, as the second terminal. The device may be notified. Similarly, "PRBj" is notified to the second terminal device as information regarding the j-th located subregion in the frequency direction among the information of the subregion in which the range of the first terminal device and the reserved resource is divided. You may.

In the example shown in FIG. 24, the size of each partial region in which the reserved resource range is divided in the time direction and the frequency direction may be different in the frequency direction. Further, a part of the subregion may be included in the other subregion.

Subsequently, an example of the operation related to the selection of the resource in consideration of the reservation level by the second terminal device notified of the information regarding the range of the reservation resource and the information regarding the reservation level will be described.

For example, the second terminal device may select the resource in consideration of the notified reservation level when selecting the resource to be used for transmitting the packet.

As a specific example, the second terminal device reserves a part of the partial range (that is, the range according to the reservation level) included in the range of the notified reserved resource at the time of resource selection. Resources included in the range according to the level may be judged as reserved resources and excluded from the resource selection candidates. That is, the second terminal device may determine the resources included in the range corresponding to the reservation level other than the partial reservation level as usable resources.

As a more specific example, the second terminal device may determine a resource included in a range corresponding to a reservation level equal to or higher than a predetermined threshold value as a reserved resource. Further, as another example, the second terminal device may determine a resource included in the range corresponding to the reservation level below a predetermined threshold value as a reserved resource. That is, the priority among the reservation levels may be appropriately changed according to the reservation level setting method and the use case.

For example, FIG. 25 is a flowchart showing an example of a processing flow related to resource selection according to a reservation level, and shows an example of processing executed by a second terminal device.

In the example shown in FIG. 25, the terminal device 200 (determination unit 245) specifies a range corresponding to the reservation level equal to or higher than the threshold value from the range corresponding to each reservation level included in the range of the reservation resource. Further, the terminal device 200 (communication processing unit 241) excludes the range corresponding to the specified reservation level from the selection candidates of the resource used for packet transmission (S101). That is, the terminal device 200 limits the range of selecting resources according to the range of reserved resources and the reservation level. Then, the terminal device 200 (communication processing unit 241) determines a resource included in a range other than the excluded range (that is, a range corresponding to the reservation level equal to or higher than the threshold value) as a usable resource, and performs a packet. Select the resource to be used for transmission (S103).

Regarding the information regarding the reservation level excluded from the resource selection candidates (in other words, the information regarding the range according to the reservation level), for example, the base station may notify each terminal device, or the terminal device may be preconfigured. It may have been done.

Further, the second terminal device is excluded from the resource selection candidates based on the priority of the packet transmitted by itself and the priority of the packet transmitted by another terminal device (for example, the first terminal device). The reservation level to be used (in other words, the range according to the reservation level) may be determined.

As a specific example, the second terminal device has information on the priority of packets transmitted from the first terminal device, information on the priority of packets that it intends to transmit, and CBR (Channel Busy Ratio) information. The reservation level to be excluded from the resource selection candidates may be determined based on at least one of the above. The information regarding the priority of the packet transmitted from the first terminal device corresponds to an example of the "first priority information". On the other hand, the information regarding the priority of the packet transmitted by the second terminal device corresponds to an example of the "second priority information".

As a specific example, the first communication terminal is transmitting a packet with a priority of 4, and the second communication terminal is on the condition that the smaller the priority level is, the more important the communication is. It is assumed that you are trying to send with priority 1. In addition, the first communication terminal is one in which a reservation is made by defining a range corresponding to each of reservation levels 1 to 4 after prescribing exclusive use in which the lower the reservation level value is, the higher priority is given. And. In such a case, the second communication terminal excludes the resources included in the range corresponding to the reservation level 1 from the selection candidates, and the resources included in the range of the reservation levels 2 to 4 can be used. It may be judged as a resource.

On the other hand, in the above example, when the priority of the packet transmitted by the first communication terminal is high and the priority of the packet transmitted by the second communication terminal is high, the reserved resource of the first communication terminal is possible. It is controlled to be secured as much as possible. As a specific example, the second terminal device excludes resources included in the range corresponding to the reservation level for all reservation levels 1 to 4 from the selection candidates, and then selects the resource to be used for packet transmission. do.

Further, in the above-mentioned example, CBR may also be considered. As a specific example, as described above, the CBR is a threshold value under the condition that the second terminal device excludes the resources included in the range corresponding to the reservation level for all the reservation levels 1 to 4 from the selection candidates. It is assumed that the situation is higher than that (that is, the band is very congested). In this case, the second terminal device may change the reservation level to be excluded from "reservation levels 1 to 4" to "reservation levels 1 to 3". In this way, in a situation where resources are tight, the second terminal device may perform control so that the CBR is further relaxed. Further, when the CBR is lower than the threshold value, the second terminal device further increases the candidates to be selected for resources other than the range of the reserved resource set by the first communication terminal. Such control may be performed.

Further, as another example, the second terminal device may stepwise select resources based on the reservation level in response to the setting result of the range corresponding to the reservation level by the first terminal device.

For example, FIG. 26 is a flowchart showing another example of the flow of processing related to resource selection according to the reservation level, and shows an example of processing executed by the second terminal device.

In the example shown in FIG. 26, the terminal device 200 (determination unit 245) specifies a range corresponding to the reservation level below the threshold value from the range corresponding to each reservation level included in the range of the reservation resource. Further, the terminal device 200 (communication processing unit 241) excludes the range corresponding to the specified reservation level from the selection candidates of the resource used for packet transmission (S201). That is, the terminal device 200 limits the range of selecting resources according to the range of reserved resources and the reservation level.

Next, the terminal device 200 (determination unit 243) searches for resources available for packet transmission from a range other than the excluded range (S203). When a resource is found (S203, YES), the terminal device 200 (communication processing unit 241) selects the resource as a resource to be used for packet transmission.

On the other hand, when the resource is not found (S203, NO), the terminal device 200 (determination unit 245) determines the range corresponding to the reservation level to be excluded from the selection candidates of the resource used for packet transmission. The above threshold value is added (incremented) (S205). Then, when the threshold value has not reached the maximum value (S207, NO), the terminal device 200 re-executes the processes indicated by the reference numerals S201 to 205.

On the other hand, when the threshold value reaches the maximum value (S207, YES), the terminal device 200 (communication processing unit 241) selects a resource based on the maximum reservation level (S209).

As described above, when the second terminal device fails to select a resource based on a certain reservation level, the reservation level used as the reference for resource selection is updated, and then the updated reservation level is used as a reference. Attempt to select the resource. In this way, the second terminal device may search for resources available for packet transmission and select the resources while sequentially updating the reservation level as a reference for resource selection. Even in this case, the second terminal device has at least one of information on the priority of the packet transmitted from the first terminal device, information on the priority of the packet to be transmitted by itself, and CBR information. , The reservation level to be excluded from the resource selection candidates may be determined based on.

Further, the first terminal device may make a burst resource reservation for each of a plurality of different frequency carriers. As a specific example, the first terminal device makes a periodic resource reservation for the frequency carrier A that is normally used and has a constant packet size, and then burst resources in different frequency carriers B for backup. You may make a reservation. Then, when the first terminal device determines that it is difficult to use the reserved resource in the frequency carrier A, the resource may be selected in the frequency carrier B. Regarding the resource reservation using a plurality of different frequency carriers described above, it is possible to apply the partial resource reservation described in detail later. As a specific example, in the above example, the partial resource reservation may be applied instead of the burst resource reservation in the frequency carrier B.

The burst resource reservation has been described above with reference to FIGS. 19 to 26.

(Partial resource reservation)
Next, the partial resource reservation will be described. For example, FIG. 27 is an explanatory diagram for explaining the outline of the partial resource reservation. As shown in FIG. 27, in the partial resource reservation, the first terminal device for making a reservation secures a plurality of ranges set to be separated from each other in chronological order as the range of the reserved resource. It differs from the burst resource reservation described above in that the reservation is made. In the following description, for convenience, each of a plurality of ranges secured so as to be separated from each other in time series by partial resource reservation is also referred to as "partial resource".

In the partial resource reservation, the interval between the partial resources may be determined from the maximum allowable delay amount of the packet and the maximum jitter amount of the packet. That is, it is more desirable that the partial resources are arranged so as not to exceed the maximum allowable delay amount of the packet even when the maximum jitter amount is reached.

Further, in the partial resource reservation, a reserved resource group may be specified. For example, FIG. 28 is an explanatory diagram for explaining an outline of one aspect of partial resource reservation, and is an example of a case where a reserved resource group is defined. In the example shown in FIG. 28, for three sets of groups each including the plurality of partial resources, reserved resources group G _A ~G _C is set.

The reserved resource group may be defined to be orthogonal to other reserved resource groups in the time-frequency direction, or may be defined to be non-orthogonal and partially overlap with other reserved resource groups. The definition of the group of partial resources set as the reserved resource group may be notified from the base station to the terminal device by using the system information. In addition, each reserved resource group may be defined so that resources having different sizes can be selected for each reserved resource group.

Further, the reserved resource group may be assigned to a group of terminal devices (hereinafter, also referred to as "terminal device group"). In this case, for example, each of the plurality of reserved resource groups may be assigned to different terminal device groups. Further, as another example, which reserved resource group is selected may be determined based on the minimum value or the maximum value of the size and jitter of the transmitted packet. Further, as another example, which reserved resource group is selected may be determined according to the priority of the transmitted packet.

Further, the first terminal device may select the reserved resource group according to the amount of jitter of the transmitted packet. For example, as reserved resource group, reserved resource group _G A, _{G B,} and _G 3 a group are defined and _C, reserved resource group _G A, _{G B,} and the maximum amount of jitter that can be supported in order of _{G C} Is set to be small. In this case, the first terminal apparatus, when transmitting a relatively large packet jitter amount adaptable jitter may select a larger reservation resource groups G _A.

Here, with reference to FIGS. 29 and 30, an example of the operation related to the transmission of the packet when the partial resource reservation is applied will be described. 29 and 30 are explanatory diagrams for explaining an example of the operation related to the transmission of the packet when the partial resource reservation is applied.

The first terminal device determines which resource to use among the plurality of partially reserved partial resources. The resource to be used is determined by selecting one or more partial resources existing within the range satisfying the latency requirement of the packet from the arrival of the packet from the upper layer to the physical layer.

As a specific example, FIG. 29 shows an example in which a packet arrives from the upper layer to the physical layer before the expected arrival packet cycle T. In this case, the packet to be transmitted is transmitted based on the first partial resource (that is, the earliest timing partial resource). In the above example, if the first partial resource does not satisfy the latency request, the first terminal device may reselect the resource by executing the resource selection procedure as an Event trigger message. good.

Further, as another example, FIG. 30 shows an example in which a packet arrives from the upper layer to the physical layer after the second partial resource. In this case, the third partial resource is selected for the packet to be transmitted. Further, when a packet arrives from the upper layer to the physical layer after the third partial resource, there is no partial resource capable of satisfying the latency request. Therefore, the first terminal device is shown in FIG. 29. As in the case of the example, the resource may be reselected by executing the resource selection procedure as an Event trigger message.

Even if each reserved resource group is defined so that resources of different sizes can be selected for each reserved resource group, by giving priority to the latency request, other than the reserved resource group assigned in advance Resources may be used.

Subsequently, when the partial resource reservation is applied, the operation of the first terminal device that has made the reservation to transmit the packet by performing sensing will be described. When the first terminal device transmits a packet by reserving and selecting a resource based on the partial resource reservation, even if the usable resource is specified based on the conditions as described below. good. For example, FIG. 31 is an explanatory diagram for explaining an outline of the operation of the terminal device that performs sensing when the partial resource reservation is applied.

In the example shown in FIG. 31, a part of the one-cycle section of one reserved lease group and a part of the sensing section overlap. In such a case, the first terminal device may specify a resource to be used for packet transmission in a period overlapping the one cycle section of the reserved resource group in the sensing section. For example, in the example shown in FIG. 31, the section of the first partial resource among the plurality of partial resources overlaps with the terminal side of the sensing section. In this case, the first terminal device may transmit the packet based on the first partial resource.

In the above example, since the resource to be used for packet transmission has already been selected in the sensing section, for example, the remaining partial resource (that is, reserved resource) overlapping the resource selection section is the first terminal. It may not be used by the device to send packets. In such a case, the partial resource (reserved resource) included in the resource selection interval may be used as an empty resource, for example, as a candidate resource selected by another terminal device for transmitting a packet. .. However, it can be assumed that the first terminal device uses a plurality of partial resources for packet transmission. In view of such a situation, for example, the first terminal device may notify surrounding terminal devices (for example, a second terminal device) of information regarding the number of partial resources to be used. Further, as another example, the first terminal device may notify surrounding terminal devices of information for identifying unused partial resources. For the above notification, for example, SCI may be used.

The partial resource reservation has been described above with reference to FIGS. 27 to 31.

<4.2. Reactive type resource reservation>
Next, the Reactive type resource reservation will be described. In the Reactive type resource reservation, the terminal device reserves the resource so that the cycle and the packet size are constant in the same manner as the conventional resource reservation method, and then when a problem occurs in transmitting the packet. , Select and reserve resources separately. For example, FIG. 32 is an explanatory diagram for explaining an outline of the Reactive type resource reservation.

As shown in FIG. 32, whether or not a problem has occurred in transmitting a packet is determined, for example, whether or not the amount of jitter exceeds the latency requirement and the size of the packet to be transmitted rather than the size of the reserved resource. It is done based on whether or not the amount is exceeded. As a more specific example, the above determination is, for example, whether or not the maximum delay allowance can be satisfied, whether or not the necessary resources can be secured, whether or not the required QoS can be satisfied, and whether or not the required QoS can be satisfied. It may be performed based on whether or not the transmission power can be planned.

Here, an example of a response when it is determined that a problem has occurred in transmitting a packet will be described below.

(Activation of resource selection trigger)
For example, the terminal device may activate the resource selection trigger when it is determined that a problem has occurred in transmitting the packet. Specifically, the terminal device searches for a resource that satisfies the latency requirement and a resource that satisfies the excess data size. Specifically, the terminal device performs a resource search using the result of background sensing when it is determined that a problem occurs.

The terminal device then selects the resource. As a specific example, the terminal device may select additional resources. At this time, the terminal device may select additional resources so as to make up for the shortage size when the resources already reserved are used to transmit the packet. Further, at this time, the terminal device may exclude the reserved resource from the resource selection candidates at the sensing stage. The reserved resource corresponds to an example of the "first resource". Further, a resource selected separately from the reserved resource (for example, a resource additionally selected) corresponds to an example of the “second resource”.

Further, as another example, the terminal device may reselect resources. Specifically, the terminal device may reselect a resource of the size required to send the packet. In this case, for example, the terminal device may define the reserved resource as a resource selection candidate, and then execute the process related to the resource reselection including the candidate.

Further, after selecting the additional resource, the terminal device transmits data (data corresponding to the packet to be transmitted) by using the selected resource. At this time, when the terminal device uses a plurality of resources for data transmission, the terminal device uses the SCI of the packet (for example, the first packet) transmitted using any of the resources to use the plurality of resources. Areas in the resource corresponding to the data transmitted by each may be indicated. Further, for each of the plurality of resources, the SCI of the packet transmitted using the resource may indicate the area in the resource corresponding to the data transmitted using the resource. In this case, the SCI may notify the other communication terminal of information indicating which packet should be merged in order for the other communication terminal to decrypt the data.

(Use existing reserved resources as much as possible)
Further, as another example, when the terminal device determines that a problem has occurred in the transmission of the packet, the terminal device may transmit the data by utilizing the existing reserved resource as much as possible. In this case, the terminal device, for example, segments the data to be transmitted into two or more. In this case, since the target data is divided into two or more packets, the terminal device notifies the other terminal device of the information for combining the data transmitted by each packet by SCI. You may. Note that the information for combining the data transmitted by each packet corresponds to an example of "control information" that associates the data transmitted by using different resources (that is, the data transmitted by different packets). do.

Further, since it can be assumed that the resource size will be insufficient in the resource selection from the next time onward, for example, the terminal device may activate the resource reselection trigger. Further, as another example, the terminal device may additionally select a resource for transmitting the shortage data in addition to the reserved resource.

(Stop Repetition transmission and send different packets)
Further, as another example, when the terminal device determines that a problem has occurred in the transmission of the packet, the repetition transmission may be stopped and a different packet may be transmitted. In this case, the terminal device notifies the other terminal device to which the packet is transmitted that a different packet has been transmitted without performing repetition transmission. Specifically, the terminal device may, for example, notify another terminal device by SCI that the target packet is not a packet transmitted by Repetition.

Further, when the terminal device stops the Repetition transmission and transmits a different packet, the packet that arrives next (that is, the Repetition) with respect to the SCI of the packet that first arrives at the other terminal device that is the destination. Information may be added indicating that the data of the packet transmitted using the transmission resource) is a continuation of the data of the previously transmitted packet. As a result, when the other terminal device on the receiving side decodes the first SCI, it recognizes that the next packet to arrive is a continuation of the data of the received packet, and is transmitted by each packet. It is possible to combine data.

Further, as another example, when the terminal device uses the resource reserved for the Repetition transmission and transmits data different from the Repetition data, the terminal device transmits NDI (New Data Indicator) to the SCI corresponding to the data. ) Etc. may be added to make it possible to distinguish from the Repetition data. In this case, the other terminal device on the receiving side determines whether or not the target data is Repetition data based on the information such as the NDI, and combines the data based on the determination result to obtain the original data. You may restore the transmitted data of.

The Reactive type resource reservation has been described above with reference to FIG. 32.

<< 5. Application example >>
The technology according to the present disclosure can be applied to various products. For example, the base station 100 may be realized as any kind of eNB (evolved Node B) such as a macro eNB or a small eNB. The small eNB may be an eNB that covers cells smaller than the macro cell, such as a pico eNB, a micro eNB, or a home (femto) eNB. Instead, the base station 100 may be realized as another type of base station such as NodeB or BTS (Base Transceiver Station). The base station 100 may include a main body (also referred to as a base station device) that controls wireless communication, and one or more RRHs (Remote Radio Heads) that are arranged at a location different from the main body. Further, various types of terminals, which will be described later, may operate as the base station 100 by temporarily or semi-permanently executing the base station function.

Further, for example, the terminal device 200 or 300 may be a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable / dongle type mobile router or a digital camera, or a car navigation device. It may be realized as an in-vehicle terminal. Further, the terminal device 200 or 300 may be realized as a terminal (also referred to as an MTC (Machine Type Communication) terminal) that performs M2M (Machine To Machine) communication. Further, the terminal device 200 or 300 may be a wireless communication module (for example, an integrated circuit module composed of one base station 100 die) mounted on these terminals.

<5.1. Application examples related to base stations>
(First application example)
FIG. 33 is a block diagram showing a first example of a schematic configuration of an eNB to which the techniques according to the present disclosure can be applied. The eNB 800 has one or more antennas 810 and a base station device 820. Each antenna 810 and base station device 820 may be connected to each other via an RF cable.

Each of the antennas 810 has a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving a radio signal by the base station apparatus 820. The eNB 800 has a plurality of antennas 810 as shown in FIG. 33, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, for example. Although FIG. 33 shows an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operates various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors and transfer the generated bundled packet. Further, the controller 821 is a logic that executes control such as radio resource control (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), inflow control (Admission Control), or scheduling (Scheduling). Function. Further, the control may be executed in cooperation with the surrounding eNB or the core network node. The memory 822 includes a RAM and a ROM, and stores a program executed by the controller 821 and various control data (for example, terminal list, transmission power data, scheduling data, etc.).

The network interface 823 is a communication interface for connecting the base station apparatus 820 to the core network 824. Controller 821 may communicate with a core network node or other eNB via network interface 823. In that case, the eNB 800 and the core network node or other eNB may be connected to each other by a logical interface (for example, S1 interface or X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for a wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a frequency band higher than the frequency band used by the wireless communication interface 825 for wireless communication.

The wireless communication interface 825 supports either a cellular communication method such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to a terminal located in the cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may perform, for example, coding / decoding, modulation / demodulation and multiplexing / demultiplexing, and may perform each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control) and PDCP. (Packet Data Convergence Protocol)) Performs various signal processing. The BB processor 826 may have some or all of the above-mentioned logical functions instead of the controller 821. The BB processor 826 may be a module including a memory for storing a communication control program, a processor for executing the program, and related circuits, and the function of the BB processor 826 may be changed by updating the above program. good. Further, the module may be a card or a blade inserted into the slot of the base station device 820, or may be a chip mounted on the card or the blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 810.

The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 33, and the plurality of BB processors 826 may correspond to a plurality of frequency bands used by, for example, the eNB 800. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 33, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. Although FIG. 33 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. It may be.

In the eNB 800 shown in FIG. 33, one or more components included in the base station 100 described with reference to FIG. 2 (for example, at least one of a communication processing unit 151, an information acquisition unit 153, and a notification unit 155). May be implemented in the wireless communication interface 825. Alternatively, at least some of these components may be implemented in controller 821. As an example, the eNB 800 may include a module including a part (for example, a BB processor 826) or all of the wireless communication interface 825 and / or a controller 821, and the module may be equipped with one or more of the above components. good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, even if a program for making the processor function as one or more of the above components is installed in the eNB 800 and the wireless communication interface 825 (eg, BB processor 826) and / or the controller 821 executes the program. good. As described above, the eNB 800, the base station device 820, or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components is provided. You may. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the eNB 800 shown in FIG. 33, the wireless communication unit 120 described with reference to FIG. 2 may be mounted on the wireless communication interface 825 (for example, RF circuit 827). Further, the antenna unit 110 may be mounted on the antenna 810. Further, the network communication unit 130 may be implemented in the controller 821 and / or the network interface 823. Further, the storage unit 140 may be mounted in the memory 822.

(Second application example)
FIG. 34 is a block diagram showing a second example of the schematic configuration of the eNB to which the technique according to the present disclosure can be applied. The eNB 830 has one or more antennas 840, a base station device 850, and an RRH860. Each antenna 840 and RRH860 may be connected to each other via an RF cable. Further, the base station apparatus 850 and RRH860 may be connected to each other by a high-speed line such as an optical fiber cable.

Each of the antennas 840 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the RRH860. The eNB 830 has a plurality of antennas 840 as shown in FIG. 34, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, for example. Although FIG. 34 shows an example in which the eNB 830 has a plurality of antennas 840, the eNB 830 may have a single antenna 840.

The base station apparatus 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, the memory 852, and the network interface 853 are the same as the controller 821, the memory 822, and the network interface 823 described with reference to FIG. 33.

The wireless communication interface 855 supports either a cellular communication method such as LTE or LTE-Advanced, and provides a wireless connection to terminals located in the sector corresponding to the RRH860 via the RRH860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 and the like. The BB processor 856 is similar to the BB processor 826 described with reference to FIG. 33, except that it is connected to the RF circuit 864 of the RRH860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as shown in FIG. 34, and the plurality of BB processors 856 may correspond to a plurality of frequency bands used by, for example, the eNB 830. Although FIG. 34 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.

The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH860. The connection interface 857 may be a communication module for communication on the high-speed line that connects the base station apparatus 850 (wireless communication interface 855) and the RRH860.

The RRH860 also includes a connection interface 861 and a wireless communication interface 863.

The connection interface 861 is an interface for connecting the RRH860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on the high-speed line.

The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include RF circuits 864 and the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 34, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements. Although FIG. 34 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.

In the eNB 830 shown in FIG. 34, one or more components included in the base station 100 described with reference to FIG. 2 (for example, at least one of a communication processing unit 151, an information acquisition unit 153, and a notification unit 155). May be implemented in wireless communication interface 855 and / or wireless communication interface 863. Alternatively, at least some of these components may be implemented in controller 851. As an example, the eNB 830 includes a module including a part (for example, BB processor 856) or all of the wireless communication interface 855 and / or a controller 851, and even if one or more of the above components are implemented in the module. good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, even if a program for making the processor function as one or more of the above components is installed in the eNB 830 and the wireless communication interface 855 (eg, BB processor 856) and / or the controller 851 executes the program. good. As described above, the eNB 830, the base station device 850, or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components is provided. You may. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the eNB 830 shown in FIG. 34, for example, the wireless communication unit 120 described with reference to FIG. 2 may be implemented in the wireless communication interface 863 (for example, RF circuit 864). Further, the antenna unit 110 may be mounted on the antenna 840. Further, the network communication unit 130 may be implemented in the controller 851 and / or the network interface 853. Further, the storage unit 140 may be mounted in the memory 852.

<5.2. Application examples related to terminal devices>
(First application example)
FIG. 35 is a block diagram showing an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, and one or more antenna switches 915. It comprises one or more antennas 916, bus 917, battery 918 and auxiliary controller 919.

The processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900. Memory 902 includes RAM and ROM and stores programs and data executed by processor 901. The storage 903 may include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.

The camera 906 has an image pickup device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates an captured image. The sensor 907 may include, for example, a group of sensors such as a positioning sensor, a gyro sensor, a geomagnetic sensor and an acceleration sensor. The microphone 908 converts the voice input to the smartphone 900 into a voice signal. The input device 909 includes, for example, a touch sensor, a keypad, a keyboard, a button, or a switch for detecting a touch on the screen of the display device 910, and receives an operation or information input from the user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900. The speaker 911 converts the voice signal output from the smartphone 900 into voice.

The wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may perform, for example, coding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and performs various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 916. The wireless communication interface 912 may be a one-chip module in which a BB processor 913 and an RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as shown in FIG. 35. Although FIG. 35 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. It may be.

Further, the wireless communication interface 912 may support other types of wireless communication systems such as a short-range wireless communication system, a near field wireless communication system, or a wireless LAN (Local Area Network) system, in addition to the cellular communication system. In that case, the BB processor 913 and the RF circuit 914 for each wireless communication system may be included.

Each of the antenna switches 915 switches the connection destination of the antenna 916 between a plurality of circuits included in the wireless communication interface 912 (for example, circuits for different wireless communication methods).

Each of the antennas 916 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the wireless communication interface 912. The smartphone 900 may have a plurality of antennas 916 as shown in FIG. 35. Although FIG. 35 shows an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.

Further, the smartphone 900 may be provided with an antenna 916 for each wireless communication method. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. .. The battery 918 supplies electric power to each block of the smartphone 900 shown in FIG. 35 via a power supply line partially shown by a broken line in the figure. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900, for example, in the sleep mode.

In the smartphone 900 shown in FIG. 35, one or more components (for example, communication processing unit 241, information acquisition unit 243, determination unit 245, and notification unit 247) included in the terminal device 200 described with reference to FIG. At least one of) may be implemented in the wireless communication interface 912. Alternatively, at least some of these components may be implemented in processor 901 or auxiliary controller 919. As an example, the smartphone 900 includes a module including a part (for example, BB processor 913) or all of the wireless communication interface 912, a processor 901, and / or an auxiliary controller 919, and one or more of the above-mentioned components in the module. May be implemented. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, a program for making the processor function as one or more of the above components is installed in the smartphone 900, the wireless communication interface 912 (eg, BB processor 913), the processor 901, and / or the auxiliary controller 919. You may run the program. As described above, the smartphone 900 or the module may be provided as a device including the one or more components, or a program for making the processor function as the one or more components may be provided. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the smartphone 900 shown in FIG. 35, for example, the wireless communication unit 220 described with reference to FIG. 3 may be mounted on the wireless communication interface 912 (for example, RF circuit 914). Further, the antenna unit 210 may be mounted on the antenna 916. Further, the storage unit 230 may be mounted in the memory 902.

(Second application example)
FIG. 36 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technique according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. It comprises an interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

The processor 921 may be, for example, a CPU or SoC, and controls the navigation function and other functions of the car navigation device 920. Memory 922 includes RAM and ROM and stores programs and data executed by processor 921.

The GPS module 924 uses GPS signals received from GPS satellites to measure the position (eg, latitude, longitude and altitude) of the car navigation device 920. The sensor 925 may include, for example, a group of sensors such as a gyro sensor, a geomagnetic sensor and a barometric pressure sensor. The data interface 926 is connected to the vehicle-mounted network 941 via a terminal (not shown), and acquires data generated on the vehicle side such as vehicle speed data.

The content player 927 reproduces the content stored in the storage medium (for example, a CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and accepts an operation or information input from the user. The display device 930 has a screen such as an LCD or an OLED display, and displays an image of a navigation function or a content to be reproduced. The speaker 931 outputs the sound of the navigation function or the content to be played.

The wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may perform, for example, coding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and performs various signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 937. The wireless communication interface 933 may be a one-chip module in which a BB processor 934 and an RF circuit 935 are integrated. The wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935 as shown in FIG. Although FIG. 36 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. It may be.

Further, the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a near field wireless communication system, or a wireless LAN system in addition to the cellular communication system. A BB processor 934 and an RF circuit 935 for each communication method may be included.

Each of the antenna switches 936 switches the connection destination of the antenna 937 between a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication methods).

Each of the antennas 937 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the wireless communication interface 933. The car navigation device 920 may have a plurality of antennas 937 as shown in FIG. Although FIG. 36 shows an example in which the car navigation device 920 has a plurality of antennas 937, the car navigation device 920 may have a single antenna 937.

Further, the car navigation device 920 may be provided with an antenna 937 for each wireless communication system. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.

The battery 938 supplies electric power to each block of the car navigation device 920 shown in FIG. 36 via a power supply line partially shown by a broken line in the figure. In addition, the battery 938 stores electric power supplied from the vehicle side.

In the car navigation device 920 shown in FIG. 36, one or more components (for example, communication processing unit 241 and information acquisition unit) included in the terminal device 200 described with reference to FIG. 3 described with reference to FIG. At least one of 243, determination unit 245, and notification unit 247) may be implemented in the wireless communication interface 933. Alternatively, at least some of these components may be implemented in processor 921. As an example, the car navigation device 920 includes a module including a part (for example, BB processor 934) or all and / or a processor 921 of the wireless communication interface 933, in which one or more of the above components are mounted. You may. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, a program for making the processor function as one or more of the above components is installed in the car navigation device 920, and the wireless communication interface 933 (eg, BB processor 934) and / or the processor 921 executes the program. You may. As described above, the car navigation device 920 or the module may be provided as a device including the one or more components, or a program for making the processor function as the one or more components may be provided. good. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the car navigation device 920 shown in FIG. 36, for example, the wireless communication unit 220 described with reference to FIG. 3 may be mounted on the wireless communication interface 933 (for example, RF circuit 935). Further, the antenna unit 210 may be mounted on the antenna 937. Further, the storage unit 230 may be mounted in the memory 922.

Further, the technique according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the vehicle-mounted network 941.

<< 6. Conclusion >>
As described above, in the system according to the embodiment of the present disclosure, the first terminal device controls the first range of reserving the resource in order to use a part of the resource for inter-device communication. .. Then, in order to control the second range in which the second terminal device selects the resource used for the inter-device communication, the first terminal device provides information on the first range to the second terminal. Notify the device. Further, the second terminal device acquires information regarding the first range of the resource reserved for the first terminal device to use a part of the resource for inter-device communication from the first terminal device. .. Further, the second terminal device controls the second range for selecting the resource to be used for the inter-device communication based on the acquired information regarding the first range. For example, the second terminal device limits the second range based on the information about the first range.

With the above configuration, resources can be allocated more flexibly even in a situation where, for example, the transmission timing of the packet varies according to the jitter component contained in the traffic, the size of the transmitted packet varies, and the like. It becomes possible. That is, according to the system according to the embodiment of the present disclosure, more flexible resource allocation becomes possible in inter-device communication such as V2X communication. In particular, in NR V2X communication, it supports new use cases that require high reliability, low delay, high-speed communication, and high capacity, which cannot be supported by LTE-based V2X. Even in such a case, according to the system according to the embodiment of the present disclosure, it is possible to more flexibly deal with each of various use cases supported by NR V2X communication.

Although the preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that a person having ordinary knowledge in the technical field of the present disclosure can come up with various modifications or modifications within the scope of the technical ideas described in the claims. Of course, it is understood that the above also belongs to the technical scope of the present disclosure.

In addition, the effects described herein are merely explanatory or exemplary and are not limited. That is, the techniques according to the present disclosure may exhibit other effects apparent to those skilled in the art from the description herein, in addition to or in place of the above effects.

The following configurations also belong to the technical scope of the present disclosure.
(1)
With the communication unit that performs wireless communication,
An acquisition unit that acquires information about the first range of the resource reserved for the other communication device to use a part of the resource for inter-device communication from the other communication device, and
A control unit that controls a second range for selecting the resource to be used for the inter-device communication based on the acquired information about the first range.
A communication device.
(2)
The communication device according to (1), wherein the control unit limits the second range based on the information regarding the first range.
(3)
The first range includes a plurality of third ranges.
A level of any of the plurality of levels is associated with each of the plurality of third ranges.
The information regarding the first range is associated with the information regarding the third range included in the first range.
The control unit controls the second range according to the acquired information about the third range.
The communication device according to (1) or (2) above.
(4)
The information regarding the third range includes level information regarding the level set in the third range.
The communication device according to (3), wherein the control unit controls so that a part of the plurality of third ranges is included in the second range according to the acquired level information.
(5)
The plurality of levels include a first level associated with the third range used exclusively and a second level associated with the third range used comprehensively. ,
The control unit determines a candidate for the third range to be included in the second range from the third range associated with the second level according to the acquired level information. ,
The communication device according to (4) above.
(6)
The control unit determines the candidate of the third range to be included in the second range according to the level information based on the conditions notified from the base station, according to the above (4) or (5). Communication device.
(7)
The control unit
The search result of the resource that can be used for the inter-device communication for the second range controlled so as to include the third range corresponding to a part of the plurality of levels. Depending on,
The second range is controlled so as to include the third range corresponding to another level different from the part of the level, and the second range can be used for the inter-device communication. Search for the resource again,
The communication device according to any one of (4) to (6) above.
(8)
The control unit sets the other level for performing the re-search.
The priority of the inter-device communication using the resource selected from the first range set by the other communication device, and
The priority of the inter-device communication using the resource selected from the second range, and
The degree of congestion in the frequency band used for inter-device communication and
Determined according to at least one of the information,
The communication device according to (7) above.
(9)
The information regarding the first range includes the first priority information regarding the priority of the inter-device communication using the resource selected from the first range set by the other communication device. ,
The control unit controls the second range based on the first priority information.
The communication device according to any one of (1) to (8) above.
(10)
The control unit is based on the first priority information and the second priority information regarding the priority of the inter-device communication using the resource selected from the second range. The communication device according to (9) above, which controls the range of.
(11)
The inter-device communication is wireless communication in which packets are periodically transmitted between a plurality of communication devices.
The communication device according to any one of (1) to (10), wherein the first range is set as one continuous range in a time series during a cycle related to the transmission of the packet.
(12)
The inter-device communication is wireless communication in which packets are periodically transmitted between a plurality of communication devices.
The communication device according to any one of (1) to (10) above, wherein the first range is set as a plurality of ranges separated from each other in a time series during a cycle relating to the transmission of the packet. ..
(13)
The interval between the plurality of ranges set to be separated from each other in a time series as the first range is the maximum allowable delay in the inter-device communication using the resource selected from the first range. The communication device according to (12) above, which is determined according to at least one of an amount and a maximum amount of jitter.
(14)
The control unit determines a range for selecting a resource to be used for transmitting the packet from the plurality of ranges set to be separated from each other in a time series according to the transmission timing of the packet. The communication device according to (12) or (13).
(15)
The communication device according to any one of (12) to (14) above, wherein a plurality of first ranges associated with different reservation groups are set during the cycle related to the transmission of the packet.
(16)
The communication device according to any one of (1) to (15) above, wherein the device-to-device communication is communication via a wireless link between a plurality of communication devices, each of which is movably configured.
(17)
With the communication unit that performs wireless communication,
A control unit that controls a first range for reserving a resource in order to use a part of the resource for inter-device communication.
A notification unit that notifies the other communication device of information about the first range in order to control a second range in which the other communication device selects the resource to be used for the inter-device communication.
A communication device.
(18)
The control unit sets a plurality of third ranges included in the first range, each of which is associated with one of the plurality of levels.
The notification unit associates the information regarding the first range with the level information regarding the third range included in the first range.
The communication device according to (17) above.
(19)
The communication device according to (18) above, wherein the conditions relating to the inter-device communication include conditions relating to at least one of the maximum jitter of the packet transmitted in the inter-device communication and the maximum size variation of the packet. ..
(20)
The communication according to (18) or (19), wherein the size of data that can be transmitted by the resource selected from the third range is set according to the level associated with the third range. Device.
(21)
The communication device according to any one of (18) to (20), wherein the information regarding the conditions for setting the third range associated with the level is notified from the base station.
(22)
The plurality of levels are set based on the probability density function of the jitter component in the inter-device communication using the resource selected from the first range, any one of the above (18) to (21). The communication device described in.
(23)
With the communication unit that performs wireless communication,
A second resource different from the first resource is selected according to the information about the first resource reserved for use in transmitting the packet in the inter-device communication and the information about the packet to be transmitted. Control unit and
A communication device.
(24)
When the size of the packet to be transmitted exceeds the size of data that can be transmitted by the first resource, the control unit uses the first resource and the second resource. , The communication device according to (23) above, which controls so that the packet is transmitted.
(25)
The control unit obtains control information for associating a part of the data of the packet transmitted by the first resource with the other part of the data of the packet transmitted by the second resource. The communication device according to (24) above, which associates the first resource with at least one of the second resources.
(26)
The computer
To perform wireless communication and
Acquiring information about the first range of the resource reserved for the other communication device to use some resources for inter-device communication from the other communication device, and
Controlling the second range for selecting the resource to be used for the inter-device communication based on the acquired information about the first range.
Communication methods, including.
(27)
The computer
To perform wireless communication and
In order to use some resources for inter-device communication, controlling the first range of reserving the resources and
Notifying the other communication device of information about the first range in order to control a second range in which the other communication device selects the resource to be used for the inter-device communication.
Communication methods, including.
(28)
The computer
To perform wireless communication and
A second resource different from the first resource is selected according to the information about the first resource reserved for use in transmitting the packet in the inter-device communication and the information about the packet to be transmitted. To do and
Communication methods, including.
(29)
On the computer
To perform wireless communication and
Acquiring information about the first range of the resource reserved for the other communication device to use some resources for inter-device communication from the other communication device, and
Controlling the second range for selecting the resource to be used for the inter-device communication based on the acquired information about the first range.
A program that runs.
(30)
On the computer
To perform wireless communication and
In order to use some resources for inter-device communication, controlling the first range of reserving the resources and
Notifying the other communication device of information about the first range in order to control a second range in which the other communication device selects the resource to be used for the inter-device communication.
A program that runs.
(31)
On the computer
To perform wireless communication and
A second resource different from the first resource is selected according to the information about the first resource reserved for use in transmitting the packet in the inter-device communication and the information about the packet to be transmitted. To do and
A program that runs.

1 System 100 Base station 110 Antenna unit 120 Wireless communication unit 130 Network communication unit 140 Storage unit 150 Control unit 151 Communication processing unit 153 Information acquisition unit 155 Notification unit 200 Terminal device 210 Antenna unit 220 Wireless communication unit 230 Storage unit 240 Control unit 241 Communication processing unit 243 Information acquisition unit 245 Judgment unit 247 Notification unit

Claims (25)

With the communication unit that performs wireless communication,
An acquisition unit that acquires information about the first range of the resource reserved for the other communication device to use a part of the resource for inter-device communication from the other communication device, and
A control unit that controls a second range for selecting the resource to be used for the inter-device communication based on the acquired information about the first range.
A communication device. The communication device according to claim 1, wherein the control unit limits the second range based on the information regarding the first range. The first range includes a plurality of third ranges.
A level of any of the plurality of levels is associated with each of the plurality of third ranges.
The information regarding the first range is associated with the information regarding the third range included in the first range.
The control unit controls the second range according to the acquired information about the third range.
The communication device according to claim 1. The information regarding the third range includes level information regarding the level set in the third range.
The communication device according to claim 3, wherein the control unit controls so that a part of the plurality of third ranges is included in the second range according to the acquired level information. The plurality of levels include a first level associated with the third range used exclusively and a second level associated with the third range used comprehensively. ,
The control unit determines a candidate for the third range to be included in the second range from the third range associated with the second level according to the acquired level information. ,
The communication device according to claim 4. The communication device according to claim 4, wherein the control unit determines a candidate for the third range to be included in the second range according to the level information based on the conditions notified from the base station. The control unit
The search result of the resource that can be used for the inter-device communication for the second range controlled so as to include the third range corresponding to a part of the plurality of levels. Depending on,
The second range is controlled so as to include the third range corresponding to another level different from the part of the level, and the second range can be used for the inter-device communication. Search for the resource again,
The communication device according to claim 4. The control unit sets the other level for performing the re-search.
The priority of the inter-device communication using the resource selected from the first range set by the other communication device, and
The priority of the inter-device communication using the resource selected from the second range, and
The degree of congestion in the frequency band used for inter-device communication and
Determined according to at least one of the information,
The communication device according to claim 7. The information regarding the first range includes the first priority information regarding the priority of the inter-device communication using the resource selected from the first range set by the other communication device. ,
The control unit controls the second range based on the first priority information.
The communication device according to claim 1. The control unit is based on the first priority information and the second priority information regarding the priority of the inter-device communication using the resource selected from the second range. 9. The communication device according to claim 9, which controls the range of the above. The inter-device communication is wireless communication in which packets are periodically transmitted between a plurality of communication devices.
The communication device according to claim 1, wherein the first range is set as one continuous range in chronological order during the cycle related to the transmission of the packet. The inter-device communication is wireless communication in which packets are periodically transmitted between a plurality of communication devices.
The communication device according to claim 1, wherein the first range is set as a plurality of ranges separated from each other in a time series during a cycle related to the transmission of the packet. The interval between the plurality of ranges set to be separated from each other in a time series as the first range is the maximum allowable delay in the inter-device communication using the resource selected from the first range. The communication device according to claim 12, which is determined according to at least one of an amount and a maximum amount of jitter. The control unit determines a range for selecting a resource to be used for transmitting the packet from the plurality of ranges set to be separated from each other in a time series according to the transmission timing of the packet. Item 12. The communication device according to item 12. The communication device according to claim 12, wherein a plurality of first ranges associated with different reservation groups are set during the cycle related to the transmission of the packet. The communication device according to claim 1, wherein the device-to-device communication is communication via a wireless link between a plurality of communication devices, each of which is configured to be movable. With the communication unit that performs wireless communication,
A control unit that controls a first range for reserving a resource in order to use a part of the resource for inter-device communication.
A notification unit that notifies the other communication device of information about the first range in order to control a second range in which the other communication device selects the resource to be used for the inter-device communication.
A communication device. The control unit sets a plurality of third ranges included in the first range, each of which is associated with one of the plurality of levels.
The notification unit associates the information regarding the first range with the level information regarding the third range included in the first range.
The communication device according to claim 17. The communication device according to claim 18, wherein the conditions relating to the inter-device communication include at least one of a maximum jitter of a packet transmitted in the inter-device communication and a maximum size variation of the packet. The communication device according to claim 18, wherein the size of data that can be transmitted by the resource selected from the third range is set according to the level associated with the third range. The communication device according to claim 18, wherein the information regarding the conditions for setting the third range associated with the level is notified from the base station. The communication device according to claim 18, wherein the plurality of levels are set based on a probability density function of a jitter component in the inter-device communication using the resource selected from the first range. With the communication unit that performs wireless communication,
A second resource different from the first resource is selected according to the information about the first resource reserved for use in transmitting the packet in the inter-device communication and the information about the packet to be transmitted. Control unit and
A communication device. When the size of the packet to be transmitted exceeds the size of data that can be transmitted by the first resource, the control unit uses the first resource and the second resource. 23. The communication device according to claim 23, which controls the packet to be transmitted. The control unit obtains control information for associating a part of the data of the packet transmitted by the first resource with the other part of the data of the packet transmitted by the second resource. The communication device according to claim 24, which associates the first resource with at least one of the second resources.

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