JP5726252B2 - Wireless communication apparatus, wireless communication method, and wireless communication program - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly to a wireless communication apparatus, a wireless communication method, and a wireless communication program used in a small-scale network such as a wireless LAN (Local Area Network).

  The Internet is commonly used not only in enterprises but also for personal use. In particular, recently, the use of the Internet by wireless communication has become familiar due to the explosive spread of mobile phones, personal computers, and smartphones combined with PDA (Personal Digital Assistant) functions and portable game machines equipped with wireless LAN functions. It is becoming. In addition, public wireless LAN is being developed, and the Internet is being used not only indoors but also outdoors or in vehicles.

  One of the features of smartphones is that various applications can be downloaded and used. As a result, the user can use in accordance with the user's preference other than the standard functions such as voice call and mail. For example, it is possible to use a smartphone as a car navigation system by downloading a car navigation application. As such a car navigation application, there is an application that can display various kinds of traffic information on a smartphone in real time by wirelessly communicating with a car navigation receiver mounted in a car as well as being used alone in an offline environment.

  However, as a problem of wireless communication between such a wireless communication device (such as a car navigation receiver) and a mobile wireless terminal (such as a smartphone), it is easily affected by electromagnetic noise, compared to the case of wired communication. There is a high possibility that temporary communication disconnection will occur. In particular, since many electronic components are mounted in the moving body (vehicle or the like), it is easily affected by various electromagnetic noise sources. Further, for example, in midsummer or midwinter, it is easily affected by temperature, and communication disconnection due to deterioration of the reception characteristics of the electronic element can be considered.

  Generally, when a temporary communication disconnection occurs, the wireless communication device initializes the S / W state in preparation for the next connection. For this reason, the communication data received by the wireless communication device may be discarded without being sent to the mobile wireless terminal. When such temporary communication disconnection frequently occurs, no service can be provided in the worst case, and the user feels uncomfortable.

  Since it is difficult to completely remove the electromagnetic noise, the wireless communication device side should take measures to reduce the influence of the temporary communication disconnection as described above to such an extent that the user does not feel uncomfortable. There is a need. Specifically, it is necessary to provide at least a buffer for saving communication data from when communication is disconnected to when communication is resumed so that the saved data can be transmitted after communication is resumed. However, for example, when a large amount of communication data is transmitted from a roadside device or the like to the wireless communication device during communication disconnection, the buffer overflows and communication data to be sent to the mobile wireless terminal is lost. There are challenges.

  As a conventional wireless communication apparatus that solves the above problem, there is a wireless communication apparatus that prevents communication data from being discarded as continuously as possible even when a buffer of the wireless communication apparatus overflows (see, for example, Patent Document 1). ).

JP 2002-176442 A

However, the prior art has the following problems.
In the wireless communication device of Patent Document 1, it is possible to prevent the communication data saved in the buffer of the wireless communication device from being discarded continuously. However, when communication data discarded without being transmitted to the user contains important information, there is a problem that service information to be provided to the user is lacking.

  In addition, some communication data saved in the buffer without being transmitted to the user has information value that decreases with the passage of time. For example, in the case of car navigation, the traffic information “500 m ahead, traffic jam” transmitted from the roadside device on the road has already moved to the traffic jam while the communication data is saved in the buffer. If it is, the information has low value.

  Sending communication data with such low information value from a wireless communication device to a mobile wireless terminal after reconnecting communication not only increases the communication load but also confuses the user. In addition, in order to be able to save a large amount of data including communication data whose information value is low, there is a problem that the capacity of the buffer must be increased.

  The present invention has been made to solve the above-described problems, and wireless communication capable of efficiently reducing a communication load and user confusion by efficiently using a buffer for saving communication data. An object is to obtain a device, a wireless communication method, and a wireless communication program.

  A wireless communication device according to the present invention includes a data transmission / reception unit that transmits and receives communication data to and from a plurality of external wireless devices, and a first external wireless device to a second external wireless device among the plurality of external wireless devices. On the other hand, in the case of performing data communication by distinguishing the type of notification and performing one notification at the time of one communication, a notification sequentially received as data communication from the first external wireless device by the data transmitting / receiving unit, Communication data that is buffered as time-series saved data and includes a data saving unit that sequentially transmits the saved data to the second external wireless device via the data transmitting / receiving unit, and is transmitted / received between a plurality of external wireless devices A terminal-side communication state monitoring unit that monitors whether the wireless connection state between the wireless communication device and the second external wireless device is “connected”, and a notification A storage unit for preliminarily storing save data constraint information that associates the save data reconstruction condition specified as a pattern with the discard target data specified as a notification to be discarded in the arrangement pattern, and a data save unit The data saving unit further includes a saved data reconstruction unit that performs saved data reconstruction processing by discarding notifications included in the buffered time-series saved data as necessary. Each time a notification is received from the backup data reconstruction unit, a saved data reconstruction request is transmitted to the saved data reconstruction unit, and the saved data reconstruction unit receives the saved data reconstruction request from the data saving unit and the terminal When the wireless connection status monitored by the communication state monitoring unit on the side is not “connected”, the saved data buffered in the data saving unit and the saved data stored in the storage unit When there is a notification arrangement pattern specified as the save data reconstruction condition in the save data based on the comparison with the data constraint information, the notification specified as the discard target data corresponding to the existing arrangement pattern Is discarded from the saved data, and the saved data reconstruction process is performed.

  The wireless communication method according to the present invention is a wireless communication method used in the wireless communication device according to the present invention, wherein the wireless connection state between the wireless communication device and the second external wireless device is “connected”. Corresponds to the terminal side communication state monitoring step that monitors whether or not the data is stored, the saved data reconstruction condition specified as the notification arrangement pattern, and the discard target data specified as the notification to be discarded in the arrangement pattern Storage step for storing the saved data restriction information in advance in the storage unit, and saving data reconstruction processing by discarding the notification included in the time-series saved data buffered in the data saving unit as necessary Each time a notification is received from the data transmission / reception unit at the saved data reconstruction step and the saved data reconstruction unit, the saved data reconstruction unit needs to be saved to the saved data reconstruction unit. And when the saved data reconstruction unit receives the saved data reconstruction request from the data saving unit and the wireless connection status monitored by the terminal-side communication status monitoring unit is not “connected” In addition, based on a comparison between the saved data buffered in the data saving unit and the saved data constraint information stored in the storage unit, there is a notification arrangement pattern defined as a saved data reconstruction condition in the saved data In this case, there is a step of executing the saved data reconstruction process by discarding the notification defined as the discard target data corresponding to the existing arrangement pattern from the saved data.

  The wireless communication program according to the present invention is a wireless communication program used in the wireless communication apparatus according to the present invention, wherein the wireless connection state between the wireless communication apparatus and the second external wireless apparatus is “ Terminal-side communication state monitoring means for monitoring whether or not “connected”, saved data reconstruction condition specified as a notification arrangement pattern, and discard target data specified as a notification to be discarded in the arrangement pattern Storage means for storing the saved data restriction information in association with the data in advance in the storage unit, and saving data by discarding the notification included in the time-series saved data buffered in the data saving unit as necessary Each time a notification is received from the data transmission / reception unit in the saved data reconstruction unit and the data saving unit for executing the reconstruction process, the saved data reconstruction unit is deleted. In the means for transmitting the data reconstruction request and the saved data reconstruction unit, when the saved data reconstruction request is received from the data saving unit and the wireless connection status monitored by the terminal-side communication status monitoring unit is “connection” If it is not `` medium '', the notification specified in the saved data reconstruction condition in the saved data is based on the comparison between the saved data buffered in the data saving unit and the saved data restriction information stored in the storage unit. When the arrangement pattern exists, the notification specified as the discard target data corresponding to the existing arrangement pattern is discarded from the saved data, thereby functioning as means for executing the saved data reconstruction process.

  According to the present invention, among communication data stored in a buffer during temporary communication disconnection, communication data whose information value has decreased with the passage of time is discarded before transmission after communication reconnection. I am doing so. As a result, it is possible to obtain a wireless communication device, a wireless communication method, and a wireless communication program that can efficiently reduce a communication load and user confusion by efficiently using a buffer for saving communication data.

It is an illustration figure of a structure of the radio | wireless communications system using the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. It is an illustration figure of the structure of the radio | wireless communication apparatus which concerns on Embodiment 1 of this invention. It is an illustration figure which shows the monitoring method of the wireless connection state by the terminal side communication state monitoring part which concerns on Embodiment 1 of this invention. It is an illustration figure of the save data constraint information memorize | stored in the memory | storage part which concerns on Embodiment 1 of this invention. It is an illustration figure of the save data reconstruction process by the save data reconstruction part which concerns on Embodiment 1 of this invention. It is a flowchart which shows an example of the reception process of communication data in the radio | wireless communication method and radio | wireless communication program which concern on Embodiment 1 of this invention. 7 is a flowchart illustrating an example of saved data reconfiguration processing in the wireless communication method and the wireless communication program according to Embodiment 1 of the present invention. 6 is a flowchart illustrating an example of communication data transmission processing in the wireless communication method and the wireless communication program according to Embodiment 1 of the present invention. It is an illustration figure of the structure of the radio | wireless communications system using the radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. It is an illustration figure of the structure of the radio | wireless communication apparatus which concerns on Embodiment 2 of this invention. It is an illustration figure of the save data constraint information memorize | stored in the memory | storage part which concerns on Embodiment 2 of this invention. It is an illustration figure of the save data reconstruction process by the save data reconstruction part which concerns on Embodiment 2 of this invention. It is a flowchart which shows an example of the reception process of communication data in the radio | wireless communication method and radio | wireless communication program which concern on Embodiment 2 of this invention. 7 is a flowchart illustrating an example of saved data reconfiguration processing in the wireless communication method and the wireless communication program according to Embodiment 2 of the present invention.

  Hereinafter, preferred embodiments of a wireless communication device, a wireless communication method, and a wireless communication program according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated about the part which is the same or it corresponds in each figure.

Embodiment 1 FIG.
First, the configuration of the wireless communication system according to the first embodiment will be described. FIG. 1 is an exemplary diagram of a configuration of a wireless communication system using a wireless communication apparatus according to Embodiment 1 of the present invention.

  The wireless communication device 200 relays communication data transmitted / received between a plurality of external wireless devices. For example, the radio communication apparatus 200 shown in FIG. 1 relays communication data between the roadside device 400 and the mobile radio terminal 300, and transmits the communication data received from the roadside device 400 to the mobile radio terminal 300. The communication data received from the mobile radio terminal 300 is transmitted to the roadside device 400.

  The wireless communication device 200 is installed inside the moving body 100 (for example, a vehicle), and the roadside machine 400 is installed outside the moving body 100 (for example, the roadside). Further, FIG. 1 shows an example in which the mobile radio terminal 300 is inside the mobile body 100, but the mobile radio terminal 300 is outside the mobile body 100 as long as it is in a range where radio communication with the radio communication device 200 is possible. Also good.

  In the following description, an intelligent transport system (ITS: Intelligent Transport Systems) is assumed as a wireless communication system as shown in FIG. 1. In the wireless communication system according to the present invention, communication data is relayed using wireless communication. It is not limited to the advanced transportation system.

  The moving body 100 may be anything that moves outdoors. For example, in addition to the vehicle, the moving body 100 may be a ship or an airplane. The wireless communication device 200 may be any device that relays communication data between the roadside device 400 and the mobile wireless terminal 300 using wireless communication. In the following description, the car navigation system installed in the mobile body 100 is used. Assume a receiver.

  The mobile wireless terminal 300 and the roadside device 400 may be any devices that transmit and receive communication data via the wireless communication device 200. In the following description, the mobile wireless terminal 300 and the roadside device 400 are installed on a smartphone and a road used by a user in the vehicle, respectively. Assuming that the infrastructure system is In this case, communication data such as traffic information is transmitted by a roadside device 400 such as an infrastructure system, relayed by a wireless communication device 200 such as a car navigation receiver, and received by a mobile wireless terminal 300 such as a smartphone. The mobile radio terminal 300 may be a tablet PC, for example.

  Further, in the following description, as a communication method of communication data between the wireless communication apparatus 200 and the mobile wireless terminal 300, wireless conforming to the IEEE802.11 (The Institute of Electrical and Electronics Engineers, Inc. 802.11) series. Although a communication method is assumed, application of other wireless communication methods is not precluded.

  In the following description, it is assumed that DSRC (Dedicated Short Range Communications) communication is performed between the wireless communication device 200 and the mobile wireless terminal 300, but this does not hinder the application of other wireless communication standards. .

  Next, the configuration of the wireless communication apparatus 200 will be described. FIG. 2 is an exemplary diagram of a configuration of radio communication apparatus 200 according to Embodiment 1 of the present invention.

  The roadside wireless I / F 202 establishes a wireless communication connection (hereinafter referred to as “data link”) for transmitting and receiving communication data between the wireless communication apparatus 200 and the roadside device 400. Similarly, the terminal-side wireless I / F 204 establishes a data link for transmitting and receiving communication data between the wireless communication device 200 and the mobile wireless terminal 300.

  The roadside communication processing unit 201 analyzes / shapes communication data received from the roadside device 400 via the roadside wireless I / F 202 and transmits the data to the data transmission / reception unit 205. Further, the roadside communication processing unit 201 analyzes / shapes the communication data received from the data transmitting / receiving unit 205 and transmits the communication data to the roadside device 400 via the roadside wireless I / F 202.

  The terminal-side communication processing unit 203 analyzes / shapes communication data received from the mobile wireless terminal 300 via the terminal-side wireless I / F 204 and transmits the communication data to the data transmitting / receiving unit 205. Further, the terminal side communication processing unit 203 analyzes / shapes the communication data from the data transmission / reception unit 205 and transmits it to the mobile radio terminal 300 via the terminal side radio I / F 204.

  Note that the method of analyzing / shaping communication data by the roadside communication processing unit 201 and the terminal side communication processing unit 203 is not limited by the present invention, and will not be described. Is possible.

  The data transmitter / receiver 205 includes a data receiver 205A and a data transmitter 205B. The data receiving unit 205A saves the communication data received from the roadside communication processing unit 201 or the terminal side communication processing unit 203 in the data saving unit 209. Then, if the wireless connection state between the terminal-side wireless I / F 204 and the mobile wireless terminal 300 is being connected, the data transmission unit 205B communicates with the communication data saved in the data saving unit 209 (hereinafter referred to as “saving data”). Is transmitted to the roadside communication processing unit 201 or the terminal side communication processing unit 203.

  The data saving unit 209 saves communication data relayed from the mobile radio terminal 300 side to the roadside device 400 side, and a buffer 209A for saving communication data relayed from the roadside device 400 side to the mobile radio terminal 300 side. And a buffer 209B. The data saving unit 209 distinguishes the types of notifications, and in the case of performing data communication so that one notification is performed at the time of one communication, the data transmission / reception unit 205 sequentially receives notifications as data communication from the roadside device 400 side. Are buffered as time-series save data, and the save data is sequentially transmitted to the mobile radio terminal 300 via the data transmitting / receiving unit 205.

  The terminal-side wireless I / F 204 notifies the terminal-side communication state monitoring unit 206 of a change in data link information indicating whether the data link with the mobile wireless terminal 300 is “connected” or “disconnected”. doing. Then, based on this data link information, the terminal-side communication state monitoring unit 206 determines the wireless connection state (hereinafter simply referred to as “wireless connection state”) between the terminal-side wireless I / F 204 and the mobile wireless terminal 300. Management is performed in three states: “connecting”, “disconnecting”, and “confirming connection”. The function of this terminal side communication state monitoring unit 206 will be described later. 2 shows an example in which the terminal-side communication state monitoring unit 206 monitors the wireless connection state on the mobile wireless terminal 300 side, but it is also possible to monitor the wireless connection state on the roadside device 400 side. It is.

  The saved data reconstruction unit 207 obtains the wireless connection status from the terminal-side communication status monitoring unit 206, and discards the communication data saved in the data saving unit 209 when the wireless connection status is not “connected”. A save data reconstruction process is performed to discard the target save data. At this time, the discard target save data is determined based on the save data restriction information 208A stored in the storage unit 208 in advance. The function of the saved data reconstruction unit 207 will also be described later.

  As described above, the wireless communication apparatus 200 according to the first embodiment is characterized by including the terminal-side communication state monitoring unit 206 and the saved data reconstruction unit 207. As a result, the communication data whose information value has decreased with the passage of time can be discarded before transmission after communication reconnection.

  Next, the function of the terminal side communication state monitoring unit 206 will be described. FIG. 3 is an exemplary diagram showing a wireless connection state monitoring method by the terminal-side communication state monitoring unit 206 according to Embodiment 1 of the present invention.

  As described above, the terminal-side wireless I / F 204 holds, as data link information, whether the data link with the mobile wireless terminal 300 is “connected” or “disconnected”. However, this data link information is low-level real-time information close to hardware and has a problem that it is difficult to use because it changes sensitively in response to electromagnetic noise or the like.

  In view of this, the terminal-side communication state monitoring unit 206 sets the wireless connection state between the terminal-side wireless I / F 204 and the mobile wireless terminal 300 at a higher level, “connected”, “disconnected”, or “connected”. Management is made in three states, “Confirming”. Specifically, even if the data link of the terminal-side wireless I / F 204 becomes “disconnected”, the terminal-side communication state monitoring unit 206 does not immediately set the wireless connection state to “disconnecting”, but once “ “Checking connection”. Then, when the state where the data link of the terminal-side wireless I / F 204 is “disconnected” continues for a certain period or longer, the wireless connection state is set to “disconnecting” for the first time. On the other hand, if the data link of the terminal side wireless I / F 204 returns to “connected” within a certain period after the wireless connection state is set to “confirming connection”, it is determined as a temporary “disconnection” due to electromagnetic noise or the like. Then, the wireless connection state is returned to “connected”.

  Next, functions of the saved data reconstruction unit 207 will be described. FIG. 4 is an exemplary diagram of the saved data restriction information 208A stored in the storage unit 208 according to Embodiment 1 of the present invention. FIG. 5 is an exemplary diagram of a saved data reconstruction process performed by the saved data reconstruction unit 207 according to Embodiment 1 of the present invention.

  As described above, the evacuation data reconstruction unit 207 determines the evacuation data to be discarded based on the evacuation data constraint information 208A stored in the storage unit 208 when performing the evacuation data reconstruction process. Here, as shown in FIG. 4, the save data constraint information 208A is a table in which a plurality of pairs of save data reconstruction conditions and discard target save data are arranged.

  The saved data reconstruction condition includes a notification arrangement pattern indicating the arrangement order of communication data (notifications) saved in the data saving unit 209, and an expiration date of elapsed time after the communication data is saved in the data saving unit 209. Is stored in advance as a comparison condition. The save data reconfiguration unit 207, if there is any save data in the data save unit 209 that satisfies the save data reconfiguration condition, the corresponding save target save stored in the save data constraint information 208A. Discard the data.

  The roadside area in notification D1 shown in FIG. 4 is communication data notified from the roadside device 400 to the wireless communication device 200 when the mobile unit 100 enters the communication area of the roadside device 400. The wireless communication device 200 can know that it has entered the communication area of the roadside device 400 by receiving the roadside area-in notification D1.

  The roadside area out notification D2 is communication data notified from the roadside device 400 to the wireless communication device 200 when the moving body 100 leaves the communication area of the roadside device 400. The wireless communication apparatus 200 can know that it has left the communication area of the roadside device 400 by receiving the roadside area out notification D2.

  The onboard equipment confirmation request command D3 is communication data notified from the roadside device 400 to the wireless communication device 200 in order to allow the user to select whether or not to use the service provided by the roadside device 400. The OBE confirmation request command D3 has an effective period of its own command in its own data, and the user can select whether to use the service by responding within this effective period. it can. For example, if the specified validity period is 20 seconds, the user must respond within 20 seconds whether or not to use the service.

  For example, when there is data including the first arrangement pattern shown in FIG. 4 in the saved data in the data saving unit 209, the wireless communication device 200 transmits a roadside area-in notification D1 to the mobile wireless terminal 300. Before, the mobile body 100 has left the area of the roadside machine 400. Therefore, in such a case, even if the communication data of the first arrangement pattern is transmitted to the mobile wireless terminal 300 from now on, the response to the in-vehicle device confirmation request command D3 by the user no longer reaches the roadside device 400. . Therefore, the save data reconstruction unit 207 discards the discard target save data corresponding to the first arrangement pattern as shown in FIG. 5 so that the user does not have to perform unnecessary operations. .

  Similarly, when the saved data in the data saving unit 209 includes data including the second arrangement pattern shown in FIG. 4, the moving body 100 has left the area of the roadside device 400. become. Therefore, the saved data is discarded. In this case, as shown in FIG. 5, only the onboard unit confirmation request command D3 is discarded, and the roadside area out notification D2 is not discarded. This is because the roadside area in notification D1 has already been transmitted to the mobile radio terminal 300, and the mobile radio terminal 300 does not know that it has left the area without receiving the roadside area out notification D2.

  In addition, when there is data including the third arrangement pattern shown in FIG. 4 in the saved data in the data saving unit 209, the user determines whether or not to use the service within the specified valid period. Must respond to. However, if the in-vehicle device confirmation request command D3 is saved in the data saving unit 209 and the valid period has passed, the service cannot be received even if the on-vehicle device confirmation request command D3 has already been responded. I'm stuck. Therefore, the saved data reconfiguration unit 207 discards the OBE confirmation request command D3 whose valid period has elapsed as shown in FIG. 5 so that the user does not have to perform an unnecessary operation.

  Next, a wireless communication method and a wireless communication program according to the first embodiment will be described using a flowchart.

  FIG. 6 is a flowchart showing an example of reception processing of communication data in the wireless communication method and the wireless communication program according to Embodiment 1 of the present invention. First, the roadside communication processing unit 201 analyzes / shapes communication data received from the roadside device 400 via the roadside wireless I / F 202, and transmits the data to the data transmitting / receiving unit 205 (step S100). Next, the data receiving unit 205A saves the received communication data in the data saving unit 209 (step S101). Next, the data saving unit 209 saves the received communication data in the buffer 209A (step S102). Next, the data saving unit 209 requests the saved data reconstruction unit 207 to perform saved data reconstruction processing for the saved data in the buffer 209A (step S103).

  FIG. 7 is a flowchart showing an example of the saved data reconstruction process in the wireless communication method and the wireless communication program according to Embodiment 1 of the present invention. When the saved data reconstruction unit 207 is requested by the data saving unit 209 to perform saved data reconstruction processing, the saved data reconstruction unit 207 acquires the wireless connection state from the terminal-side communication state monitoring unit 206 (step S200). Next, the saved data reconstruction unit 207 ends the saved data reconstruction process when the wireless connection state acquired in step S200 is “connected” (step S201: YES).

  On the other hand, when the wireless connection state acquired in step S200 is not “connected” (step S201: NO), the save data reconstruction unit 207 checks the arrangement pattern of the save data (notification) in the buffer 209A ( Step S202). Next, the saved data reconstruction unit 207 does not include any of the arrangement patterns of the saved data reconstruction conditions stored in advance in the saved data restriction information 208A of the storage unit 208 in the saved data in the buffer 209A (step In S203: No), the saved data reconstruction process is terminated.

  If the saved data in the buffer 209A includes the saved data reconstruction condition including the first arrangement pattern of the saved data reconstruction condition shown in FIG. 4 (step S203: Y1), the saved data reconstruction unit 207 displays the roadside area in The notification D1, the in-vehicle device confirmation request command D3, and the roadside area out notification D2 are discarded from the buffer 209A, and the saved data reconstruction process is terminated (step S204).

  In addition, when the saved data in the buffer 209A includes the second arrangement pattern shown in FIG. 4 (step S203: Y2), the saved data reconstruction unit 207 sends the OBE confirmation request command D3. Discard from the buffer 209A and end the saved data reconstruction process (step S205).

  In addition, when the saved data in the buffer 209A includes the third arrangement pattern shown in FIG. 4 (step S203: Y3), the saved data reconstruction unit 207 sends the OBE confirmation request command D3 itself. Is compared with the elapsed time after the on-board unit confirmation request command D3 is saved in the data saving unit 209 (step S206).

  When the elapsed time of the OBE confirmation request command D3 exceeds the valid period of the OBE confirmation request command D3 (step S207: YES), the saved data reconstruction unit 207 buffers the OBE confirmation request command D3. Discard from 209A and end the saved data reconstruction process (step S208). On the other hand, when the elapsed time of the OBE confirmation request command D3 does not exceed the valid period of the OBE confirmation request command D3 (step S207: NO), the process returns to step S200 to repeat the saved data reconstruction process.

  FIG. 8 is a flowchart showing an example of transmission processing of communication data in the wireless communication method and the wireless communication program according to Embodiment 1 of the present invention. The data transmission unit 205B acquires the wireless connection state from the terminal side communication state monitoring unit 206 (step S300). Next, when the wireless connection state acquired in step 300 is not “connected”, the data transmission unit 205B repeats the processes of step S300 and step S301 until the wireless connection state becomes “connected” (step S301: NO).

  On the other hand, when the wireless connection state acquired in step S300 is “connected” (step S301: YES), the data transmission unit 205B checks whether communication data is saved in the buffer 209A (step S302). ). If the communication data is not saved in the buffer 209A (step S303: NO), the process returns to step S300. On the other hand, when the communication data is saved in the buffer 209A (step S303: YES), the data transmission unit 205B transmits the communication data in the buffer 209A to the terminal side communication processing unit 203 (step S304), and the step Return to S300.

  In this way, every time a data reconfiguration request occurs, unnecessary data is quickly discarded by reconfiguring the buffer 209A (discarding data) in the saved data restructuring unit 207 in accordance with the saved data reconstruction condition. The buffer 209A can be used efficiently. This leads to a reduction in the amount of communication data. Furthermore, unnecessary user notifications can be reduced for the user, and the user's discomfort can be reduced.

  As described above, according to the first embodiment, among communication data stored in the buffer during temporary communication disconnection, communication data whose information value has decreased with time has passed. Discard before sending. As a result, it is possible to obtain a wireless communication device, a wireless communication method, and a wireless communication program that can efficiently reduce a communication load and user confusion by efficiently using a buffer for saving communication data.

  In the first embodiment, the case where the three types of saved data reconstruction conditions shown in FIG. 4 are used has been described. However, the saved data reconstruction conditions are not limited to these three types. Addition / deletion can be arbitrarily set.

  In the first embodiment, the case where communication data is relayed from the roadside device 400 side to the mobile radio terminal 300 side has been described. However, even when communication data is relayed from the mobile radio terminal 300 side to the roadside device 400 side, Similar techniques can be used.

  In addition, what is described as “to part” in the first embodiment may be “to circuit” and “to device”, and “to step”, “to procedure”, and “to processing”. There may be. That is, “˜unit” may be realized by any method, for example, firmware, software, hardware such as an element, a device, a board, wiring, or a combination thereof. It doesn't matter.

Embodiment 2. FIG.
In the first embodiment, the communication data saved in the buffer 209A was transmitted from the roadside device 400. However, the communication data that is the target of the saved data reconstruction process is not limited to that transmitted by the roadside device 400. Therefore, in the second embodiment, as an example of communication data other than that transmitted by the roadside device 400, communication data generated by the user I / F provided in the wireless communication device 200 is set as a target of saved data reconstruction processing. This shows that the same effect can be obtained.

  First, the configuration of the radio communication system according to the second embodiment will be described. FIG. 9 is an exemplary diagram of a configuration of a radio communication system using radio communication apparatus 200 according to Embodiment 2 of the present invention. The wireless communication apparatus 200 shown in FIG. 9 is characterized by having a card slot that is a user I / F 210 as compared to the case of the first embodiment shown in FIG. Other configurations are the same as those in FIG.

  An ETC (Electric Toll Collection) card (not shown) is inserted into / removed from the user I / F 210 (card slot). By passing the area of the roadside device 400 with the ETC card inserted into the user I / F 210, automatic toll collection for toll roads becomes possible.

  Next, the configuration of the wireless communication apparatus 200 will be described. FIG. 10 is an exemplary diagram of a configuration of radio communication apparatus 200 according to Embodiment 2 of the present invention. The wireless communication apparatus 200 shown in FIG. 10 is characterized by including a user I / F 210 and a user event processing unit 211, as compared with the case of the first embodiment shown in FIG.

  The user I / F 210 converts an event (such as insertion or removal of an ETC card) by the user into an electrical signal and outputs the electrical signal to the user event processing unit 211 as user event information. Further, the user event processing unit 211 creates communication data based on the user event information output from the user I / F 210 and transmits the communication data to the data transmission / reception unit 205. Other configurations are the same as those in FIG.

  Next, functions of the saved data reconstruction unit 207 will be described. FIG. 11 is an exemplary diagram of the saved data restriction information 208A stored in the storage unit 208 according to Embodiment 2 of the present invention. FIG. 12 is an exemplary diagram of a saved data reconstruction process performed by the saved data reconstruction unit 207 according to Embodiment 2 of the present invention. In addition, in FIG. 11, illustration is abbreviate | omitted about the 1st-3rd arrangement pattern shown in FIG.

  A card insertion notification D5 shown in FIG. 11 is communication data notified to the wireless communication apparatus 200 when an ETC card is inserted into the card slot 200. The card removal notification D6 is communication data notified to the wireless communication device 200 when the ETC card is removed from the card slot. The user event related command D7 is communication data for notifying the mobile radio terminal 300 of events such as an ETC card authentication result other than insertion of an ETC card and removal of an ETC card.

  For example, when there is data including the fourth arrangement pattern shown in FIG. 11 in the saved data in the data saving unit 209, before the wireless communication device 200 transmits the card insertion notification D5 to the mobile wireless terminal 300 In addition, the ETC card has been removed. From the viewpoint of the mobile radio terminal 300, this is the same as when the ETC card is not inserted into the card slot from the beginning. Therefore, as shown in FIG. 12, the saved data reconstruction unit 207 reduces unnecessary user notifications by discarding all user event related commands D7 between the card insertion notification D5 and the card removal notification D6. User discomfort can be reduced.

  Next, a wireless communication method and a wireless communication program according to the second embodiment will be described using a flowchart. The communication data transmission process is the same as that shown in FIG.

  FIG. 13 is a flowchart illustrating an example of communication data reception processing in the wireless communication method and the wireless communication program according to Embodiment 2 of the present invention. First, the user event processing unit 211 creates communication data based on the user event information output from the user I / F 210 and transmits the communication data to the data transmission / reception unit 205 (step S400).

  The processing from step S401 to step S403 is the same as the processing from step S101 to step S103 shown in FIG.

  FIG. 14 is a flowchart showing an example of saved data reconfiguration processing in the wireless communication method and the wireless communication program according to Embodiment 2 of the present invention. The saved data reconstruction process shown in FIG. 14 is characterized by comprising step S500 as compared with the case of the first embodiment shown in FIG. The other steps are the same as those in FIG.

  In step S203, when the saved data in the buffer 209A includes the saved data reconstruction condition including the fourth arrangement pattern shown in FIG. 11 (step S203: Y4), the saved data reconstruction unit 207 The card insertion notification D5, the card removal notification D6, and all user event related commands D7 between the card insertion notification D5 and the card removal notification D6 are discarded from the buffer 209A (step S500). Then, the saved data reconstruction process ends.

  In this way, every time a data reconfiguration request occurs, unnecessary data is quickly discarded by reconfiguring the buffer 209A (discarding data) in the saved data restructuring unit 207 in accordance with the saved data reconstruction condition. The buffer 209A can be used efficiently. This leads to a reduction in the amount of communication data. Furthermore, unnecessary user notifications can be reduced for the user, and the user's discomfort can be reduced.

  As described above, according to the second embodiment, even when the communication data generated by the user I / F provided in the wireless communication apparatus is the target of the saved data reconstruction process, Similar effects can be obtained.

  In the second embodiment, the wireless communication method and the wireless communication program when using the saved data reconstruction condition shown in FIG. 11 have been described. However, the saved data reconstruction condition is not limited to this, and Setting / adding / deleting can be arbitrarily set.

  In the second embodiment, the case where the communication data is relayed from the user I / F 210 to the mobile radio terminal 300 has been described. However, the case where the communication data is relayed from the mobile radio terminal 300 to the roadside device 400, or the roadside device Even when communication data is relayed from 400 to the mobile radio terminal 300, the same method can be used.

  DESCRIPTION OF SYMBOLS 100 Mobile body, 200 Wireless communication apparatus, 201 Roadside communication processing part, 202 Roadside wireless I / F, 203 Terminal side communication processing part, 204 Terminal side wireless I / F, 205 Data transmission / reception part, 205A Data reception part, 205B Data transmission 206, terminal-side communication status monitoring unit, 207 saved data reconstruction unit, 208 storage unit, 208A saved data restriction information, 209 data saving unit, 209A buffer, 209B buffer, 210 user I / F, 211 user event processing unit, 300 mobile radio terminal (second external radio device), 400 roadside machine (first external radio device).

Claims (7)

A data transmission / reception unit for transmitting / receiving communication data to / from a plurality of external wireless devices;
Among the plurality of external wireless devices, data communication is performed by distinguishing the type of notification from the first external wireless device to the second external wireless device so that one notification is made at the time of one communication. In the case, the notifications sequentially received as the data communication from the first external wireless device by the data transmission / reception unit are buffered as time-series saved data, and the second external radio is transmitted via the data transmission / reception unit A wireless communication device that relays the communication data transmitted and received between the plurality of external wireless devices, comprising: a data saving unit that sequentially transmits the saved data to a device;
A terminal-side communication state monitoring unit that monitors whether or not a wireless connection state between the wireless communication device and the second external wireless device is “connected”;
A storage unit for preliminarily storing save data restriction information in which save data reconstruction conditions defined as notification arrangement patterns are associated with discard target data specified as notifications to be discarded in the arrangement patterns;
A save data reconfiguration unit that performs a save data reconfiguration process by discarding the notification included in the time series save data buffered in the data save unit, if necessary,
The data saving unit sends a saved data reconstruction request to the saved data reconstruction unit every time a notification is received from the data transmitting / receiving unit,
The saved data reconfiguration unit receives the saved data reconfiguration request from the data save unit, and the wireless connection status monitored by the terminal-side communication status monitoring unit is not “connected” The notification defined as the saved data reconstruction condition in the saved data based on the comparison between the saved data buffered in the data saving unit and the saved data restriction information stored in the storage unit When the arrangement pattern is present, a radio communication apparatus that performs the saved data reconfiguration process by discarding the notification defined as the discard target data corresponding to the existing arrangement pattern from the saved data . The wireless communication device according to claim 1,
The saved data reconstruction unit has a state in which the notification arrangement pattern defined as the saved data reconstruction condition exists in the saved data exceeds a valid period determined in advance according to the arrangement pattern. A wireless communication device that performs the saved data reconfiguration process when the data is pending. The wireless communication device according to claim 1 or 2,
The wireless communication device is installed in a moving body,
The plurality of external wireless devices include a roadside device installed on a roadside and a mobile wireless terminal used by a user in the moving body. In the radio | wireless communication apparatus of any one of Claim 1 to 3,
A user I / F that converts a user event into an electrical signal and outputs it as user event information;
A user event processing unit that creates a notification corresponding to the user event information output by the user I / F and transmits the notification to the data transmission / reception unit;
The storage unit stores the saved data restriction information in advance as a form including a notification transmitted from the user event processing unit,
The data saving unit is a wireless communication device that buffers the notification received from the first external wireless device by the data transmitting / receiving unit and the notification received from the user event processing unit as time-series saved data. In the radio | wireless communication apparatus of any one of Claim 1 to 4,
The terminal side communication state monitoring unit is
When the data link between the wireless communication device and the second external wireless device is “connected”, the wireless connection state is “connected”,
Wherein if the data link is set to "disconnect", in terms of the set to the wireless connection state once the "connecting confirmation", when the data link is in the "disconnected" and continued over a certain time period, the radio When the connection state is “disconnected”, and when the data link returns to “connected” within the predetermined period after the data link becomes “disconnected”, the wireless connection state is “connected”. "
The data transmission / reception unit receives a notification from the first external wireless device or the user event processing unit, and the wireless connection state output by the terminal-side communication state monitoring unit is “connected” A wireless communication device that transmits the communication data to the second external wireless device.
A wireless communication method used in the wireless communication device according to claim 1,
A terminal-side communication state monitoring step for monitoring whether or not a wireless connection state between the wireless communication device and the second external wireless device is “connected”;
A storage that stores in advance in the storage unit saved data constraint information that associates saved data reconstruction conditions defined as notification arrangement patterns with discard target data specified as notifications to be discarded in the arrangement patterns Steps,
A saved data reconstruction step for performing a saved data reconstruction process by discarding a notification included in the time-series saved data buffered in the data saving unit, if necessary;
In the data saving unit, every time a notification is received from the data transmission / reception unit, a step of sending a saved data reconstruction request to the saved data reconstruction unit;
When the saved data reconstruction unit receives the saved data reconstruction request from the data saving unit, and the wireless connection status monitored by the terminal-side communication status monitoring unit is not “connected” The notification defined as the saved data reconstruction condition in the saved data based on the comparison between the saved data buffered in the data saving unit and the saved data restriction information stored in the storage unit When the arrangement pattern is present, the step of performing the saved data reconstruction process by discarding the notification defined as the discard target data corresponding to the existing arrangement pattern from the saved data; A wireless communication method. A wireless communication program used in the wireless communication device according to claim 1,
Computer
Terminal side communication state monitoring means for monitoring whether or not the wireless connection state between the wireless communication device and the second external wireless device is “connected”;
A storage that stores in advance in the storage unit saved data constraint information that associates saved data reconstruction conditions defined as notification arrangement patterns with discard target data specified as notifications to be discarded in the arrangement patterns Means,
A saved data reconstruction means for performing a saved data reconstruction process by discarding a notification included in the time-series saved data buffered in the data saving unit, if necessary;
Means for transmitting a saved data reconfiguration request to the saved data reconstruction unit each time a notification is received from the data transmitting / receiving unit in the data saving unit;
When the saved data reconstruction unit receives the saved data reconstruction request from the data saving unit, and the wireless connection status monitored by the terminal-side communication status monitoring unit is not “connected” The notification defined as the saved data reconstruction condition in the saved data based on the comparison between the saved data buffered in the data saving unit and the saved data restriction information stored in the storage unit Means for performing the saved data reconstruction processing by discarding the notification defined as the data to be discarded corresponding to the existing arranged pattern from the saved data. A wireless communication program that allows you to function.

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