JP2021010045A - User device and communication method - Google Patents

Abstract

To select an appropriate wireless communication method according to the location or the movement route of a user device.SOLUTION: A user device used in a wireless communication system includes a communication rule setting unit that sets communication rules associated with the position or the movement route of the user device for selecting a wireless communication method, a communication method selection unit that selects a wireless communication method according to the set communication rules, and a communication unit that performs communication according to the selected wireless communication method.SELECTED DRAWING: Figure 4

Description

The present invention relates to a user device in a wireless communication system.

In LTE (Long Term Evolution) and LTE successor systems (for example, LTE-A (LTE-Advanced), NR (New Radio) (also called 5G)), user devices communicate directly with each other without going through a radio base station. The D2D (Device to Device) technology to be performed is being studied.

D2D reduces the traffic between the user equipment and the base station, and enables communication between the user equipment even when the base station becomes unable to communicate due to a disaster or the like.

D2D includes D2D discovery (also referred to as D2D discovery) for finding other communicable user devices and D2D communication (D2D direct communication, D2D communication, direct communication between terminals) for direct communication between user devices. It is also roughly divided into. Hereinafter, when D2D communication, D2D discovery, etc. are not particularly distinguished, they are simply referred to as D2D. Further, a signal transmitted / received in D2D is called a D2D signal.

In 3GPP (3rd Generation Partnership Project), D2D is referred to as "sidelink", but in the present specification, D2D, which is a more general term, is used. However, in the description of the embodiment described later, sidelink is also used as needed.

Further, in 3GPP, it is considered to realize V2X (Vehicle to Everything) by expanding the above D2D function, and specification is being promoted. Here, V2X is a part of ITS (Intelligent Transport Systems), and as shown in FIG. 1, V2V (Vehicle to Vehicle), which means a communication mode performed between automobiles, is installed on the side of an automobile and a road. V2I (Vehicle to Infrastructure), which means a communication mode between a vehicle and a road-side unit (RSU), and V2N (Vehicle to), which means a communication mode between a car and a driver's mobile terminal. Nomadic device) and V2P (Vehicle to Vehicle), which means a communication mode between a car and a pedestrian mobile terminal.

In LTE Rel-14, some functions of V2X are specified (for example, Non-Patent Document 1). In this specification, Mode 3 and Mode 4 are defined with respect to resource allocation for V2X communication to a user device. In Mode3, transmission resources are dynamically allocated by DCI (Downlink Control Information) sent from the base station to the user equipment. In addition, SPS (Semi Persistent Scheduling) is also possible in Mode3. In Mode4, the user device autonomously selects a transmission resource from the resource pool.

Japanese Unexamined Patent Publication No. 2012-054763

3GPP TS 36.213 V14.2.0 (2017-03)

In D2D, the communication environment differs depending on the location where the user device is located, and the application of D2D also differs depending on the user device. Therefore, it is desirable to select an appropriate wireless communication method according to the communication environment, application, and the like. For example, D2D is suitable for short-distance communication within the line of sight, but communication via a base station may be suitable when there are many obstacles. It should be noted that the selection of an appropriate wireless communication method is not limited to the selection of a wireless communication method within the same wireless access method (RAT: Radio Access Technology), such as communication via sidelink and eNB in LTE, and is different. Also includes selection of wireless access method.

In the current cellular communication, there is a technique for appropriately selecting whether to communicate via a base station or directly according to the radio quality (for example, Patent Document 1). However, when the communication environment can change significantly like V2X, if the communication rule of selecting a wireless communication method with good wireless quality is always applied, communication may become unstable or the amount of signaling may increase. , Not always appropriate.

In view of the above points, an object of the present invention is to select an appropriate wireless communication method according to the position or movement path of the user device.

According to the disclosed technology, it is a user device used in a wireless communication system.
A communication rule setting unit that sets a communication rule associated with the position or movement path of the user device for selecting a wireless communication method, and a communication rule setting unit.
A communication method selection unit that selects a wireless communication method according to the set communication rules,
With a communication unit that communicates according to the selected wireless communication method
A user device having the above is provided.

According to the disclosed technology, it is possible to select an appropriate wireless communication method according to the position of the user device, the movement path, and the like.

It is a figure for demonstrating V2X. It is a figure for demonstrating D2D. It is a figure for demonstrating D2D. It is a figure which shows the configuration example of the wireless communication system which concerns on embodiment. It is a figure for demonstrating operation example 1 in the wireless communication system which concerns on embodiment. It is a figure for demonstrating operation example 2 in the wireless communication system which concerns on embodiment. It is a figure which shows an example of the functional structure of the user apparatus which concerns on embodiment. It is a figure which shows an example of the functional structure of the ITS server which concerns on embodiment. It is a figure which shows an example of the hardware configuration of the user apparatus and ITS server which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. For example, the wireless communication system according to the present embodiment assumes an LTE-compliant system, but the present invention is not limited to LTE and can be applied to other systems. In the present specification and claims, "LTE" corresponds not only to the communication method corresponding to 3GPP release 8 or 9, but also to 3GPP release 10, 11, 12, 13, or release 14 or later. It is used in a broad sense including the 5th generation (5G, NR) communication method.

Further, although the present embodiment mainly targets communication including V2X, the technology according to the present embodiment can be widely applied not only to V2X but also to D2D in general. Further, "D2D" includes V2X as its meaning. Further, the term "D2D" is not limited to LTE, and refers to general communication between terminals. Further, the technique according to the present embodiment can be applied to both "D2D communication" and "D2D discovery".

Further, unless otherwise specified, the "D2D signal" may be a data signal, an SCI, a discovery signal, or a pair of an SCI and a data signal. ..

<Overview of D2D>
Since D2D is the basic technology in the present embodiment, first, the outline of D2D defined by LTE will be described. It should be noted that the D2D technology described here can also be used in V2X, and the user apparatus according to the present embodiment can transmit and receive D2D signals by the technology.

As already explained, D2D is roughly divided into "D2D discovery" and "D2D communication". As for "D2D discovery", as shown in FIG. 2A, a resource pool for the Discovery message is secured for each Discovery period, and the user device transmits the Discovery message (discovery signal) in the resource pool. More specifically, there are Type1 and Type2b. In Type 1, the user device autonomously selects a transmission resource from the resource pool. In Type2b, quasi-static resources are allocated by upper layer signaling (for example, RRC signal).

As for "D2D communication", as shown in FIG. 2B, a resource pool for SCI (Sidelink Control Information) / data transmission is periodically secured. The user device on the transmitting side notifies the receiving side of a data transmission resource (PSSCH resource pool) or the like by SCI with a resource selected from the Control resource pool (PSCCH resource pool), and transmits data with the data transmission resource. More specifically, there are Mode1 and Mode2 for "D2D communication". In Mode 1, resources are dynamically allocated by (E) PDCCH sent from the base station to the user equipment. In Mode2, the user device autonomously selects a transmission resource from the resource pool. For resource pools, SIB notifications or predefined resource pools are used.

Further, as already described, in Rel-14, in addition to Mode1 and Mode2, there are Mode3 and Mode4. In Rel-14, SCI and data can be transmitted simultaneously (in one subframe) in resource blocks adjacent in the frequency direction. In addition, SCI may be called SA (Scheduling Assistance).

In LTE, the channel used for "D2D discovery" is called PSDCH (Physical Sidelink Discovery Channel), and the channel for transmitting control information such as SCI in "D2D communication" is called PSCCH (Physical Sidelink Control Channel). The channel for transmitting the data is referred to as PSSCH (Physical Sidelink Shared Channel). Further, the PSCCH and the PSSCH have a PUSCH-based structure, and have a structure in which DMRS (Demodulation Reference Signal, demodulation reference signal) is inserted.

<System configuration>
FIG. 3 is a diagram showing a configuration example of the wireless communication system according to the present embodiment. As shown in FIG. 3, the wireless communication system according to the present embodiment includes base stations (also referred to as eNBs) 10A and 10B, user devices (also referred to as UEs) 20A to 20D, and an ITS server 30. The wireless communication system supports D2D, and the user devices 20A to 20D can directly communicate with each other without going through the base station 10A or 10B. In D2D, one of the user devices 20A to 20D is the transmitting side and the other one is the receiving side, but the user devices 20A to 20D both have both a transmitting function and a receiving function. Hereinafter, when the user devices 20A to 20D are not particularly distinguished, they are simply described as "user device 20". Similarly, when base stations 10A and 10B are not particularly distinguished, they are simply described as "base station 10".

The user device 20 shown in FIG. 3 has a function of cellular communication as a user device in LTE (LTE in the sense of including 5G and NR in addition to the existing LTE, and the same applies hereinafter), and signal transmission / reception on the above-mentioned channel. It has a D2D function including. Further, the user device 20 has a function of executing the operation described in the present embodiment, sets a communication rule associated with the position or the movement path of the user device 20, and follows the set communication rule. You can select the wireless communication method.

In a typical example of V2X, the user device 20 is an in-vehicle terminal mounted on a vehicle, but the user device 20 may be a terminal carried by a pedestrian or the like, or may be a terminal mounted on a drone or an aircraft.

Further, the base station 10 has a function of cellular communication as the base station 10 in LTE and a function of enabling communication of the user device 20 in the present embodiment.

The ITS server 30 is a server that optimizes road traffic by transmitting and receiving information to and from the user device 20. In the present embodiment, the ITS server 30 has a function of a communication rule management server that provides communication rules to the user device 20. The communication rule is associated with a position or a movement route, and when the position or the movement route of the user device 20 changes, the communication rule applied by the user device 20 also changes. The communication rule is generated based on the radio quality and the like, and is stored in the data storage connected to the ITS server 30. The ITS server 30 may be aggregated into a single server or distributed to a plurality of servers. For example, when a plurality of ITS servers 30 exist, the user apparatus 20 may synthesize and apply the communication rules provided by the plurality of ITS servers 30, and apply the communication rules according to a predetermined priority. You may. Further, for example, one ITS server 30 may synthesize communication rules generated by a plurality of ITS servers 30 and provide them to the user apparatus 20.

The communication rule in the present embodiment is a communication rule for selecting a wireless communication method, and is associated with a position, a movement route, a time, and the like. The communication rules include, for example, (1) a threshold value for the measurement result for each wireless communication method, (2) a position or movement route to which the communication rule is applied, (3) a vehicle running state, (4) available wireless communication methods, ( It may include any one or more of 5) expected performance for each wireless communication method, (6) communication to be applied, and (7) time zone to which the communication rule is applied. Specifically, (2) the position or movement route to which the communication rule is applied includes coordinate information such as latitude, longitude, and altitude to which the communication rule is applied, the cell ID of the connection cell and / or the detection cell to which the communication rule is applied, and the like. It may include road traffic map information such as radio base station information, road type (expressway, general road) to which communication rules are applied, speed limit, road name, and position on the road. (3) The traveling state of the vehicle may include speed and acceleration. (4) Available wireless communication methods include communication methods that cannot be used in a specific area such as an area outside the coverage or an area where D2D cannot be performed to avoid interference with other systems, and setting information (wireless) used in D2D. Parameters) or communication parameters such as certificates may be included. (4) The expected performance for each wireless communication method may include reliability such as communication distance and packet arrival rate, throughput, communication delay, and the like. (5) The application target communication is an application or message type to which the communication rule is applied, a specific connection destination (logical channel, bearer, APN (Access Point)) in order to avoid the influence on the communication that is not suitable for control by the ITS server 30. Name), etc.), a specific destination, whether the application target is transmission only, reception only, or both transmission and reception, etc. may be included. Further, in order to support communication with different requirements, it is possible to apply different communication rules for each type of communication to be applied.

Hereinafter, the operation example of the present embodiment will be described in detail, but the user device 20 and the ITS server 30 determine whether or not the operation example of the present embodiment is applied to the contract information or the authentication information of the user device 20. The determination may be made based on the running state of the user device 20 (for example, running, stopped, engine operating), or the like.

<Operation example 1>
First, with reference to FIG. 4, an example will be described in which the user apparatus 20 receives a communication rule from the ITS server 30 and selects a wireless communication method according to the received communication rule. FIG. 4 is a diagram for explaining an operation example 1 in the wireless communication system according to the embodiment.

The ITS server 30 stores the communication rule provided to the user device 20, and the user device 20 receives the communication rule from the ITS server 30 (S102). The communication rule in the present embodiment is a rule that defines a condition for selecting a wireless communication method, but may be an instruction for selecting a specific wireless communication method. That is, the ITS server 30 may instruct the user device 20 of a specific wireless communication method. It is also possible for the user device 20 to set the communication rule in the user device 20 in advance without receiving the communication rule from the ITS server 30. As described in detail below, communication rules are generated based on communication characteristics such as radio quality.

The transmission of the communication rule to the user device 20 may be performed by unicast, broadcast or multicast. Note that multicast is a method of transmitting to a plurality of user devices at the same time, and is not limited to cellular communication. Broadcast may also be considered as a form of multicast. As an example of multicast, MBMS (Multimedia Broadcast / Multicast Service) specified in 3GPP, CBS (Cell Broadcast Service), ETWS (Earthquake and Tsunami Broadcast) Standard Broadcast (Earthquake and Tsunami Broadcasting System) DVB-IPDC (Digital Video Broadcasting-Internet Protocol Datacast) or DVB-H (Digital Video Broadcasting-Handheld), JSR272 specified in JCP, BCAS Standard specified in OMA, BCAS Standard (BCAS) There are ISDB-T (Integrated Services Digital Video Broadcasting-Terrestrial) or MediaFLO, which is a multimedia broadcasting standard for mobile terminals.

When the communication rule is transmitted by multicast, the user device 20 that has correctly received the communication rule may report to that effect to the ITS server 30. The ITS server 30 can improve the reliability by transmitting the communication rule by unicast to the user device that has not been reported within a certain period of time.

The user device 20 sets a communication rule and selects a wireless communication method according to the set communication rule (S104). The wireless communication method refers to a wireless interface and / or a wireless parameter, and the selection of a wireless communication method means selecting one or more wireless communication methods (including a combination of wireless communication methods) from a plurality of wireless communication methods. Switching from one wireless communication method to another wireless communication method (including switching from D2D to communication via the base station or switching from the base station to D2D within the same RAT), specific wireless communication Includes disabling the method. For example, selection of a radio communication method includes selecting any radio interface and / or radio parameter for transmission, selection for reception, selection for both transmission and reception. For example, disabling the wireless communication method also includes disabling transmission, disabling reception, and disabling both transmission and reception. Further, the invalidation of the wireless communication method may be realized by dropping the transmission packet of the wireless communication method, or may be realized by invalidating the wireless interface of the wireless communication method, and the higher layer is notified to the higher level. It may be realized by the invalidation processing of the layer.

The user device 20 selects the wireless communication method within the range of the communication rule provided by the ITS server 30. For example, when the communication rule includes (1) a threshold value for the measurement result for each wireless communication method, the user device 20 selects one or more wireless communication methods from the wireless communication methods having better wireless quality than the threshold value. Further, for example, when the communication rule includes (2) a position or a movement route to which the communication rule is applied, and (3) a traveling state of the vehicle, the user device 20 uses the user device 20 to perform the position, the moving route, or the traveling of the vehicle. Select the communication rule according to the status, and select the wireless communication method according to the selected communication rule. As a result, it becomes possible to select a wireless communication method based on information that can be grasped in real time on the user device 20 side. Further, for example, when the communication rule includes (4) available wireless communication methods, the user device 20 selects one or more wireless communication methods from the available wireless communication methods. Further, for example, when the communication rule includes (5) the expected performance for each wireless communication method, the user device 20 selects a wireless communication method that satisfies the communication requirements to be applied. Further, for example, when the communication rule includes (6) the communication to be applied, the wireless communication method to be applied to the communication is selected. Further, for example, when the communication rule includes the time zone in which the communication rule (7) is applied, the wireless communication method corresponding to the current time zone of the user apparatus 20 is selected.

The user device 20 communicates according to the selected wireless communication method (S106). In principle, the user device 20 uses the selected wireless communication method, but the user device 20 can additionally use a wireless communication method not instructed by the ITS server 30. For example, even when only D2D is instructed by the ITS server, the user device 20 may additionally use communication via the base station depending on the situation. As a result, the communication quality can be improved as long as the communication cost and the capacity of the user device 20 allow. Further, even when the user device is instructed to communicate via the base station, it is not necessary to transmit to the base station in consideration of the communication cost, and the communication regulation of the network operator is prioritized. It is not necessary to transmit to the base station.

Further, the user device 20 may maintain a connection with the base station even when communication via the base station is not performed in a certain area. For example, the user device 20 may maintain a connection with the base station by limiting only packet transmission. As a result, it is possible to avoid the delay even when a communication requiring a low delay occurs.

Further, the user apparatus 20 may select communication via a base station for communication other than a specific application, packet type or destination, even if it is not defined in the communication rule. For example, periodical location information registration to the ITS server 30, base station 10 or core network may be performed via the base station, and keep-alive communication so as not to be idle may be performed via the base station. You may.

The user device 20 acquires communication characteristics and transmits the communication characteristics to the ITS server 30 while communicating according to the selected wireless communication method (S108). The communication characteristics are acquired for each wireless communication method, and are, for example, (1) the communication distance of the received packet, the packet size, the packet type, the source position or the vehicle state included in the packet, and (2) RSRP (Reference Signal Received). Radio measurement results such as Power) or RSSI (Received Signal Strength Indicator), (3) Packet reception results such as throughput or delay, (4) Position where packet reception or radio measurement was performed (position of own vehicle, between transmitting and receiving vehicles) Includes distance), vehicle condition (running speed, steering condition, braking condition, etc.), (5) wireless parameters, etc. The communication characteristics may be data that has been statistically (for example, averaged) for a certain period of time or in a certain area.

The user device 20 may autonomously transmit the communication characteristics to the ITS server 30, or may transmit the communication characteristics to the ITS server 30 according to the request from the ITS server 30. For example, the ITS server 30 may request the application in the user device 20 to report the communication characteristics, and the API (Application Program Interface) defined between the core network and the ITS server 30 may be used to request the core network. May request the application in the user apparatus 20 to report the communication characteristics. The request from the ITS server 30 or the autonomous report by the user device 20 may be made periodically, for example, every fixed mileage, or every time the specified area is passed. It may also be triggered by handover or location registration. Further, for example, the request may be delivered from the ITS server 30 by multicast, a random time offset may be applied within a predetermined time range, and then the user device 20 may report to the ITS server 30. Further, for example, the communication characteristics reported by the user apparatus 20 to the base station or the core network may be acquired by the ITS server 30 using the API defined between the core network and the ITS server 30.

The ITS server 30 retains the reported communication characteristics for a certain period of time, and generates or updates communication rules based on the communication characteristics (S110). For example, the ITS server 30 may generate a communication rule that determines an area where the radio quality of D2D is always poor based on the communication characteristics and selects a communication method via a base station in the area. Further, for example, the ITS server 30 may determine an area outside the coverage of the base station based on the communication characteristics, and generate a communication rule for selecting a D2D communication method in the area outside the coverage. Further, for example, when the ITS server 30 grasps that a large vehicle exists nearby from the content of the packet included in the communication characteristics or the source, it is difficult to perform D2D with the vehicle hidden in the shadow of the large vehicle. It may be determined that a communication rule is generated to enable communication via the base station. Further, for example, when the ITS server 30 finds that the other user device 20 has already transmitted information such as hazard information that has little difference between the user devices 20 from the contents of the packet included in the communication characteristics. Communication rules may be generated that invalidate the reporting of the corresponding information to the network. In this way, communication rules that detect D2D performance deterioration depending on the surrounding vehicle conditions, D2D performance deterioration in a certain area, etc., select communication via the base station, or use it in combination with communication via the base station. By generating, it becomes possible to communicate with a wider range of peripheral vehicles.

Further, for example, the ITS server 30 manages a list of user devices that perform communication via a base station in a certain area and a list of user devices that perform D2D based on the communication characteristics, and based on the comparison of these lists. Then, a communication rule in the area may be generated. The comparison of the list may be performed by the ID of the user device, or by the position of the user device or the number of user devices. As a result of comparing these lists, when the ID, position or number of the user devices match, a communication rule that preferentially selects the D2D communication method (for example, a communication rule that invalidates communication via the base station, A communication rule) that lowers the rate of communication via the base station may be generated. On the other hand, if the IDs, positions, or numbers of the user devices do not match as a result of comparing these lists, a communication rule that preferentially selects the communication method via the base station (for example, the D2D communication method is invalidated). Communication rules, communication rules that increase the rate of communication via the base station) may be generated. It is also possible for the user device 20 to compare the user device that performs communication via the base station with the user device that performs D2D and transmit the communication characteristics to the ITS server 30. For example, the user device 20 may report to the ITS server 30 a user device that can communicate via the base station but cannot be detected by D2D, and can detect it by D2D, but communication via the base station is not possible. Possible user devices may be reported to the ITS server 30. The ITS server 30 may generate a communication rule that preferentially selects the D2D communication method or the communication method via the base station as described above, based on the comparison result in the user device 20 included in the communication characteristics. .. As a result, it is possible to enable or disable communication via the base station, rate control, and the like based on the reliability of D2D, and it is possible to reduce the network load as needed.

Further, the ITS server 30 receives information indicating the presence or absence of the D2D function from the user device 20, and when a user device 20 having no D2D function appears in a certain area, priority is given to the communication method via the base station in the area. Communication rules to be selected (for example, communication rules that invalidate the D2D communication method, communication rules that increase the rate of communication via the base station) may be generated.

The user device 20 requests the ITS server 30 to update the communication rule based on a specific event in the user device 20, and updates the communication rule received from the ITS server 30 (S112, S114). For example, the user device 20 may request the update of the communication rule at a preset date and time such as a midnight time zone in order to reduce the network load. Further, for example, the user device 20 may request an update of the communication rule when the user device 20 is started, when an application is started, or the like. In addition, for example, the user device may request an update of the communication rule in a specific vehicle state such as when the side brake is applied to avoid the driving influence or when the engine is stopped. .. Further, for example, the user device 20 may request the distribution of communication rules when passing through a preset place such as near a border in order to reflect the difference in parameters depending on the country. Further, for example, when the user apparatus 20 receives broadcast information such as SIB (System Information Block), CBS (Cell Broadcast Service), and ETWS (Earthquake and Tsunami Warning System) from the base station, the communication rule is updated. You may. The user device 20 may make reception settings for receiving communication rules multicast on a specific carrier based on broadcast information from the base station. Further, for example, the user apparatus 20 may receive a notification for immediately invalidating the current communication rule or a notification for invalidating after the timer expires by broadcasting information from the base station. As a result of the current communication rule being invalidated, the user device 20 requests the ITS server 30 to update the communication rule.

<Operation example 2>
Next, an example in which the user device 20 generates or updates a communication rule based on the communication characteristics will be described with reference to FIG. FIG. 5 is a diagram for explaining an operation example 2 in the wireless communication system according to the embodiment. Hereinafter, the points different from FIG. 4 will be described.

Similar to steps S102 to S106, the user apparatus 20 receives and sets a communication rule, selects a wireless communication method according to the communication rule, and performs communication (S202 to S206).

The user device 20 acquires the communication characteristics and generates or updates the communication rules based on the communication characteristics (S208). For example, when the user device 20 grasps that a large vehicle exists nearby from the content of the packet received by D2D or the source, it is determined that D2D with the vehicle hidden in the shadow of the large vehicle is difficult. , Communication rules may be generated to enable communication via the base station. Further, for example, when the user device 20 finds that another user device 20 has already transmitted information such as hazard information having a small difference between the user devices 20, the report of the corresponding information to the network is invalidated. You may generate a communication rule to be changed. In this way, by detecting D2D performance deterioration depending on the surrounding vehicle conditions, D2D performance deterioration in a certain area, etc., and selecting communication via the base station or using it in combination with communication via the base station, , Enables communication with a wider range of peripheral vehicles.

Further, for example, the user device 20 compares a user device that performs communication via a base station with a user device that performs D2D, and although communication via the base station is possible, there is a user device that cannot be detected by D2D. When it is understood that the communication method is to be performed, a communication rule that preferentially selects the communication method via the base station (for example, a communication rule that invalidates the D2D communication method, a communication rule that raises the communication rate via the base station) is generated. You may. Further, when the user device 20 finds that there is a user device that can be detected by D2D but cannot communicate via the base station, a communication rule that preferentially selects the D2D communication method (for example, , Communication rules that invalidate communication via the base station, communication rules that lower the rate of communication via the base station) may be generated. As a result, it is possible to enable or disable communication via the base station, rate control, and the like based on the reliability of D2D, and it is possible to reduce the network load as needed.

The user apparatus 20 may transmit the generated or updated communication rule to the ITS server 30 (S210). The ITS server 30 may update the communication rule according to the communication rule received from the user device 20, or may notify the other user device 20 of the communication rule.

<Device configuration>
Next, a functional configuration example of the user device 20 and the ITS server 30 that execute the processing operations described so far will be described. The user device 20 and the ITS server 30 may have all the functions described in the operation example 1 and the operation example 2, or may have the functions of any of the operation examples.

FIG. 6 is a diagram showing an example of the functional configuration of the user device 20. As shown in FIG. 6, the user device 20 includes an application unit 210, a communication processing unit 220, a data storage 230, and a communication rule storage unit 240. The application unit 210 is a functional unit for providing a service such as V2X, and has a transmission packet generation unit 212, a reception packet processing unit 214, a communication rule setting unit 216, and a wireless communication method selection unit 218. The communication processing unit 220 is a functional unit for providing wireless communication including a D2D function and a cellular function, and includes a packet shaping unit 222 and a transmission / reception unit 224-1 to 224-4 (hereinafter referred to as a transmission / reception unit 224). Have. The number of transmission / reception units 224 can be set to any one or more. The data storage 230 is a storage device (for example, a memory) that stores information used by the application unit 210 (for example, map information, travel plan), logs output by the application unit 210 (for example, operation log, communication log), and the like. is there. The communication rule storage unit 240 is a storage device (for example, a memory) for storing communication rules. The functional configuration shown in FIG. 6 is only an example. Any name may be used for the function classification and the function unit as long as the operation according to the present embodiment can be executed.

The transmission packet generation unit 212 generates a packet to be transmitted to another device in order to realize a service such as V2X, and outputs the generated packet to the communication processing unit 220. Regarding the setting of the communication rule, the transmission packet generation unit 212 sends a packet for reporting the communication characteristic, a packet for requesting the update of the communication rule, a packet for transmitting the communication rule generated by the user device 20 itself, and the like. Generate.

The received packet processing unit 214 processes a packet received from another device via the communication processing unit 220. Regarding the setting of the communication rule, the received packet processing unit 214 outputs the communication rule to the communication rule setting unit 216 when the communication rule is received from the ITS server 30.

The communication rule setting unit 216 stores the received communication rule in the communication rule storage unit 240. The communication rule setting unit 216 may acquire the communication characteristics during communication and report the communication characteristics to the ITS server 30, or may generate or update the communication rules based on the communication characteristics.

The wireless communication method selection unit 218 selects the wireless communication method according to the communication rule.

The packet shaping unit 222 shapes the packet according to the wireless communication method selected by the wireless communication method selection unit 218.

The transmission / reception unit 224 corresponds to, for example, different RATs, generates a radio signal from the packet output from the packet shaping unit 222 and transmits the radio signal, and generates a packet from the received radio signal to generate the packet shaping unit. Output to 222. Note that D2D and communication via the base station may be realized by the same transmitter / receiver as long as the RAT is the same (for example, communication via sidelink and eNB in LTE), or may be realized by different transmitters / receivers.

FIG. 7 is a diagram showing an example of the functional configuration of the ITS server 30. As shown in FIG. 7, the ITS server 30 includes a transmission / reception unit 310, a communication rule notification unit 320, a communication characteristic reception unit 330, a communication rule generation unit 340, and a data storage 350. The functional configuration shown in FIG. 7 is only an example. Any name may be used for the function classification and the function unit as long as the operation according to the present embodiment can be executed.

The transmission / reception unit 310 transmits a packet addressed to the user device 20 and also receives a packet from the user device 20.

When the communication rule notification unit 320 receives the request for distribution of the communication rule from the user device 20, the communication rule notification unit 320 acquires the necessary communication rule from the data storage 350 and notifies the user device 20 of the necessary communication rule.

The communication characteristic receiving unit 330 receives the communication characteristic reported from the user apparatus 20, and stores the communication characteristic in the data storage 350 for generating or updating the communication rule.

The communication rule generation unit 340 acquires communication characteristics for a certain period from the data storage 350, and generates or updates communication rules based on the communication characteristics.

<Hardware configuration>
The block diagrams (FIGS. 6 to 7) used in the description of the above embodiment show blocks of functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated from each other directly and. / Or indirectly (eg, wired and / or wireless) may be connected and realized by these plurality of devices.

Further, for example, the user device 20 and the ITS server 30 in one embodiment of the present invention may both function as computers that perform processing according to the present embodiment. FIG. 8 is a diagram showing an example of the hardware configuration of the user device 20 and the ITS server 30 according to the present embodiment. The user device 20 and the ITS server 30 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.

In the following description, the word "device" can be read as a circuit, device, unit, or the like. The hardware configuration of the user device 20 and the ITS server 30 may be configured to include one or more of the devices shown in 1001 to 1006 shown in the figure, or may be configured not to include some devices. You may.

For each function of the user device 20 and the ITS server 30, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation, and the communication device 1004 communicates with the memory 1002. And by controlling the reading and / or writing of data in the storage 1003.

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

Further, the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the application unit 210 and the communication processing unit 220 of the user apparatus 20 shown in FIG. 6 may be realized by a control program stored in the memory 1002 and operated by the processor 1001. Further, for example, the transmission / reception unit 310, the communication rule notification unit 320, the communication characteristic reception unit 330, and the communication rule generation unit 340 of the ITS server 30 shown in FIG. 7 are stored in the memory 1002 and are operated by a control program operated by the processor 1001. It may be realized. Although it has been described that the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be mounted on one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of, for example, a ROM (Read Only Memory), an EPROM (Erasable Program ROM), an EEPROM (Electrically Erasable Program ROM), a RAM (Random Access Memory), or a RAM (Random Access Memory). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to perform the process according to the embodiment of the present invention.

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

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. For example, the transmission / reception unit 224 of the user device 20 may be realized by the communication device 1004. Further, the transmission / reception unit 310 of the ITS server 30 may be realized by the communication device 1004.

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

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

Further, the user apparatus 20 and the ITS server 30 are a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device, etc.), and an FPGA (FP), respectively. It may be configured to include hardware, and the hardware may realize a part or all of each functional block. For example, processor 1001 may be implemented on at least one of these hardware.

<Summary of embodiments>
As described above, according to the present embodiment, the user device used in the wireless communication system is associated with the position or movement path of the user device for selecting the wireless communication method. Provided by a user device having a communication rule setting unit for setting a communication rule, a communication method selection unit for selecting a wireless communication method according to the set communication rule, and a communication unit for communicating according to the selected wireless communication method. Will be done.

The above-mentioned user device can select an appropriate wireless communication method according to the position of the user device, the movement route, and the like. As a result, communication can be stabilized and the amount of signaling can be reduced. For example, it is possible to reduce the communication cost and the amount of signaling with the base station by transmitting and receiving normally in D2D and performing communication via the base station only when the conditions are satisfied.

Further, the communication rule setting unit acquires communication characteristics while communicating according to the selected wireless communication method and transmits the communication characteristics to the communication rule management server, and the communication generated by the communication rule management server based on the communication characteristics. You may receive the rule and set it.

According to the above configuration, the communication rule management server can apply the communication rules collected from a plurality of user devices, and it is possible to select an appropriate wireless communication method in consideration of a wide range of surrounding environments. Become.

Further, the communication rule setting unit may generate a communication rule based on the communication characteristic of the user device.

According to the above configuration, it is possible to select an appropriate wireless communication method based on the information that can be grasped in real time on the user device side.

Further, the communication rule setting unit may update the communication rule based on a specific event in the user device.

According to the above configuration, the distribution of communication parameters can be associated with a specific event such as a specific time zone, vehicle condition, passage of a preset place, etc., which can reduce the load on the ITS server and drive. Impacts can be avoided and regional differences in parameters can be reflected.

<Supplementary form>
Although the embodiments of the present invention have been described above, the disclosed inventions are not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, substitutions, and the like. There will be. Although explanations have been given using specific numerical examples in order to promote understanding of the invention, these numerical values are merely examples and any appropriate value may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in combination with another item. May apply (as long as there is no conflict) to the matters described in. The boundary of the functional unit or the processing unit in the functional block diagram does not always correspond to the boundary of the physical component. The operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. With respect to the processing procedure described in the embodiment, the order of processing may be changed as long as there is no contradiction. For convenience of processing description, each device according to the present embodiment has been described using a functional block diagram, but such a device may be realized by hardware, software, or a combination thereof. The software operated by the processor included in each device according to the embodiment of the present invention is a random access memory (RAM), a flash memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, respectively. It may be stored on a CD-ROM, database, server or any other suitable storage medium.

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

Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered Trademarks), GSM®, CDMA2000, UMB (Ultra Mobile Band), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), It may be applied to systems utilizing Bluetooth®, other suitable systems and / or next-generation systems extended based on them.

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

In some cases, the specific operation performed by the base station 10 in the present specification may be performed by its upper node (upper node). In a network composed of one or more network nodes having a base station 10, various operations performed for communication with the user apparatus 20 are other than the base station 10 and / or the base station 10. It is clear that it can be done by other network nodes, such as, but not limited to, MME or S-GW. Although the case where there is one network node other than the base station 10 is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Each aspect / embodiment described in the present specification may be used alone, in combination, or may be switched and used according to the execution.

The user device UE may be a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, etc. It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

Base station 10 may also be referred to by one of ordinary skill in the art by NB (NodeB), eNB (enhanced NodeB), base station (Base Station), gNB, or some other suitable term.

As used herein, the terms "determining" and "determining" may include a wide variety of actions. “Judgment” and “decision” include, for example, judgment, calculation, computing, processing, deriving, investigating, searching up (for example, table). , Searching in a database or another data structure), ascertaining can be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include the fact that (for example, accessing the data in the memory) is regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when they are resolved, selected, selected, established, compared, etc. Can include. That is, "judgment" and "decision" may include that some action is regarded as "judgment" and "decision".

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

As long as "include", "include", and variations thereof are used herein or in the claims, these terms are similar to the term "comprising". , Intended to be inclusive. Moreover, the term "or" as used herein or in the claims is intended not to be an exclusive OR.

Throughout this disclosure, if articles are added by translation, for example, a, an, and the in English, these articles are not explicitly indicated by the context to be otherwise. Can include more than one.

Although the present invention has been described in detail above, it is clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description herein is for purposes of illustration only and has no restrictive meaning to the present invention.

10 Base station 20 User device 30 ITS server 210 Application unit 212 Transmission packet generation unit 214 Received packet processing unit 216 Communication rule setting unit 218 Wireless communication method selection unit 220 Communication processing unit 222 Packet shaping unit 224 Transmission / reception unit 230 Data storage 240 Communication rules Storage unit 310 Transmission / reception unit 320 Communication rule notification unit 330 Communication characteristic reception unit 340 Communication rule generation unit 350 Data storage

Claims (5)

A user device used in a wireless communication system.
A communication rule setting unit that sets a communication rule associated with the position or movement path of the user device for selecting a wireless communication method, and a communication rule setting unit.
A communication method selection unit that selects a wireless communication method according to the set communication rules,
With a communication unit that communicates according to the selected wireless communication method
User device with. The communication rule setting unit acquires communication characteristics during communication according to the selected wireless communication method and transmits the communication characteristics to the communication rule management server, and the communication rule generated by the communication rule management server based on the communication characteristics. The user device according to claim 1, which receives and sets. The user device according to claim 1, wherein the communication rule setting unit generates a communication rule based on the communication characteristics of the user device. The user device according to any one of claims 1 to 3, wherein the communication rule setting unit updates the communication rule based on a specific event in the user device. A communication method in a user device used in a wireless communication system.
A step of setting a communication rule associated with the position or movement path of the user device for selecting a wireless communication method, and
Steps to select a wireless communication method according to the set communication rules,
The step of communicating according to the selected wireless communication method and
Communication method with.

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