JP2001186576A - Mobile communication unit, stationary station communication unit, application processing unit and communication method for mobile communication unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance data transfer rate within the range of the DSRC protocol standards. SOLUTION: A communication control circuit 1a provided in the inside of an on-vehicle device 1 used for the automatic fare collection system adds information, such as a sequence number data length to data to be generated and sent by an application processing unit 2, corresponding to four channels and divides the resulting data, assigns them respectively to LID1-LID4 and transmits them according to the DSRC protocol. A road-side unit 3 assembles the received data to restore the original data. By using a plurality of LIDs data transfer processing can be conducted through retrial processing, even when data transfer is failed. Available LIDs among the 4 LIDs are retrieved by receiving an FCMC and a plurality of idle slots are used effectively, so that the efficiency of data transmission can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link processing for transmitting a link identification code of itself and communicating with the fixed station communication device when entering the communication area of the fixed station communication device. Once established, thereafter, a mobile communication device including communication control means for controlling communication processing using the link identification code, a fixed station communication device communicating with the mobile communication device, and the mobile communication device TECHNICAL FIELD The present invention relates to an application processing device for performing data transfer using a communication device and a communication method of a mobile communication device.

[0002]

As this type of vehicle, for example, a roadside machine (fixed station communication device) provided in a roadside station (fixed station) mounted on a vehicle and installed on the road when traveling on the road ) Is provided for on-board equipment (mobile communication apparatus). ARIB (Association of toll roads)
According to the DSRC (Dedicated Short Range Communication) standard of Radio Industries and Businesses (STD-55), a roadside device uses a plurality of MDS (Mess
age Data Slot) allows multiplexing of data channels. Thereby, the vehicle-mounted devices mounted on a plurality of vehicles can simultaneously perform the communication processing with the roadside device.

However, such a standard is a mechanism for simultaneously communicating with a plurality of vehicles by allocating an MDS to each vehicle-mounted device of the plurality of vehicles. One slot is allocated to this. Therefore, multiple MDs can be stored in one vehicle-mounted device.
S cannot be assigned to perform mutual communication with the roadside device. For this reason, when exchanging data with one vehicle by DSRC communication, the vehicle-mounted device can use only one MDS even if there is another empty slot, and the data transfer speed cannot be increased. Met.

By the way, as described above, a plurality of MDSs are
The inability of one vehicle to be used is due to the following reasons. That is, when a plurality of MDSs are allocated to one vehicle-mounted device on the roadside device side by DSRC communication, and when a communication error occurs even in one of the plurality of allocated MDSs, the roadside device or the onboard vehicle The order of MDC on the data receiving side of the device is discontinuous.

[0005] For example, as shown in FIG.
In a communication protocol, when data to be transmitted is received, this is transmitted to an LPDU (Link Protocol Data Unit).
Is divided into a data length of 512 octets, and a MAC layer (Medium) is further provided for each LPDU.
At the stage of passing the data to the Access Control Sub Layer, the data is divided into data lengths (65 octets) specified by the MPDU. Finally, this MPDU (MAC Protocol Data Uni
In the layer 1 with the data length of t), data is transmitted to each slot MDC.

Therefore, as shown in FIG.
When U is divided into multiple MPDUs and transmitted,
When one LID is used, for example, the first FID
MDC (Message Data) that transmitted data of MPDU 3 in a frame of CMC (Frame Control Message Channel)
When Channel 3) cannot be received on the receiving side due to a communication error, it cannot be passed to the MAC layer on the receiving side. At this time, even if the MDC 3 that transmits the data of the MPDU 3 in which the communication error has occurred is retransmitted in the next FCMC frame, the receiving side MAC layer cannot receive the MPDU 3 that should be received sequentially, so that the subsequent MPD 3 cannot be received.
All data after U4 will be discarded.

[0007] This is because the discontinuous MDC
This is because it is specified that the received MDC should be discarded, so that all the MDCs that can be received correctly are also discarded. Further, when discarding the received MDC due to such a communication error,
There is no provision for returning from that state,
A retry process or the like cannot be performed, and the communication is interrupted. For this reason, a plurality of MDSs cannot be assigned to one vehicle-mounted device.

The present invention has been made in view of the above circumstances, and an object of the present invention is to increase the data transfer rate because one vehicle cannot be assigned with a plurality of MDSs according to the standard as described above. A mobile communication device that can improve the data transfer rate by adopting a method such as using a plurality of MDSs within the range of the standard even when the mobile communication device is specified to be fixed. An object of the present invention is to provide a communication method for a station communication device, an application processing device, and a mobile communication device.

[0009]

According to the first aspect of the present invention, the communication control means transmits a plurality of link identification codes set therein when entering the communication area of the fixed station communication device. A link process for performing communication with the fixed station communication device is performed. When the link is established, the communication process is performed using the plurality of link identification codes. If a link can be established, communication processing can be performed at a higher data transmission rate than communication processing that can be performed using one link identification code.

With this, when the data transmission amount increases depending on the application, a vacant portion of the usable communication capacity can be secured by establishing the link processing by the link identification code, and the data transmission processing can be efficiently performed. I can do well. In addition, this means that in a fixed station communication device, the number of link identification codes that can establish a link at the same time is set to be larger, the utilization factor can be improved, and individual mobile communication devices can be improved. In, the transmission capacity can be increased.

According to the second aspect of the present invention, when the communication control means enters the communication area of the fixed station communication device, the communication control means transmits the link identification code set for itself and communicates with the fixed station communication device. Perform link processing to perform,
After the link is established, the communication processing is performed using the plurality of link identification codes. Therefore, by performing the communication processing using the plurality of link identification codes, 1 is obtained.
Compared to the communication process that can be performed with one link identification code,
The communication process can be performed with the data transmission speed increased, and the same effects as described above can be obtained.

According to the third aspect of the present invention, in the above configuration, when the communication control means receives data to be transmitted from one or a plurality of application processing devices, the data is transmitted to the plurality of link identification codes. When the amount of data to be transmitted from the application processing apparatus is large, efficient transmission processing with an increased transfer rate can be performed when the data is transmitted by dividing the data into communication processing units using .

According to the fourth aspect of the present invention, in each of the above configurations, the communication control means sets the number of the plurality of link identification codes in accordance with the amount of data to be transmitted from the application processing apparatus. The communication processing can be efficiently performed without securing the necessary transfer capacity and inadvertently occupying the communicable capacity and preventing communication by other mobile communication devices.

According to a fifth aspect of the present invention, in the mobile communication device according to the first or second aspect, when the communication control means receives data to be transmitted from a plurality of application processing devices, a plurality of links are used. Since the data to be transmitted is transmitted by allocating the identification code in the unit of the application processing device, the use of the link identification code can be efficiently used in the unit of the application processing device. In addition, since the required data transmission speed can be secured in accordance with the usage state of the application processing apparatus, it is possible to effectively utilize the range of the communicable capacity and perform the rapid data transmission processing. become.

According to the present invention, when the transmission capacity of data to be transmitted from the application processing device is equal to or more than a predetermined value,
Since the plurality of link identification codes are assigned to the application processing device and the data to be transmitted is transmitted, the capacity of the data to be transmitted by the application processing device is increased and the processing capacity is reduced. Can be prevented, and a certain data transmission processing capability can be secured.

According to the seventh aspect of the present invention, in each of the above configurations, the communication control means sets the number of the plurality of link identification codes as the maximum usable number, and sets the fixed station communication apparatus within the range of the number. The data transmission process is performed by using the link identification code that can be used between the server and the server, so the maximum number of link identification codes that can be used is used while using the link identification code within the usable range. By doing so, it is possible to use the communication capacity effectively without occupying the communicable capacity.

According to an eighth aspect of the present invention, in the above-mentioned configuration, the communication control means sets the plurality of set link identification codes to a link identification code usable with the fixed station communication device. If the number is small, the data transmission process is executed while determining that the unused link identification code can be used, so that the link process is established while securing the necessary link identification code. The data transmission process can be performed using the link identification code.

According to the ninth aspect of the present invention, in each of the above-mentioned configurations, the communication control means includes a DSR with the fixed station communication device.
When configured to be mounted on an on-board unit that communicates using the C method, it is used for data transmission processing such as automatic toll collection on toll roads, and when this is used to transmit data using an application processing device. However, efficient data transmission processing can be performed while securing the data transmission speed.

According to the tenth aspect of the present invention, in the above configuration, the communication control means performs communication processing using a plurality of link identification codes different from each other for a plurality of MDSs following the FCMS. Therefore, the communication processing performed for each MDS can be performed by using an independent link identification code and combined, thereby improving the data transmission rate by using a plurality of MDSs while using the DSRC communication processing. It is possible to smoothly perform communication processing when an error occurs.

According to an eleventh aspect of the present invention, in the ninth or tenth aspect of the present invention, the communication control means receives the FCMS transmitted by the fixed station communication device to obtain the information of the empty slot, and obtains the information of the empty slot. The link processing is performed by transmitting the link identification code corresponding to the number of empty slots based on the communication information, so that the utilization rate of the empty slots can be increased, efficient communication processing can be performed, and communication processing with increased data transmission speed can be performed. Will be able to do it.

According to the twelfth aspect of the present invention, in the above-mentioned configuration, the communication control means receives the FCMS transmitted by the fixed station communication device, and includes therein the MDS corresponding to the transmitted link identification code. If there is no link identification code, the link identification code is transmitted again and the next reception F
Since the CMS is configured to be repeatedly executed until the MDS corresponding to the link identification code is included, the link processing can be reliably established.

According to the thirteenth aspect of the present invention, in each of the above-described configurations, when the communication control means establishes link processing using a plurality of link identification codes, the fixed station communication device transmits each link identification code. Since the data is assembled by combining the data to be received in the specified order, it is possible to reliably restore the data received for each link identification code even if there is a temporal difference between them. Become like

According to the fourteenth aspect of the present invention, in each of the above structures, the communication control means generates a plurality of link identification codes by changing the specific bits using one link identification code. A plurality of link identification codes can be obtained easily and quickly using the original link identification code. For example, in the case of using a plurality of link identification codes after establishing a link, it is possible to quickly prepare a plurality of available link identification codes without preparing a plurality of link identification codes in advance. The communication process can be started without delay.

According to the fifteenth aspect of the present invention, when a fixed station communication device receives a plurality of link identification codes from a mobile communication device that has entered a communication area, the mobile communication device can use the link identification codes that can be used. When the link is established, control is performed so that communication can be performed using the link identification code that can be used thereafter. In comparison, communication processing can be performed with the data transmission speed increased.

With this, when the data transmission amount increases depending on the application, a vacant portion of the usable communication capacity can be secured by establishing the link processing by the link identification code, and the data transmission processing can be performed efficiently. I can do well. This also means that the higher the number of link identification codes for which a link can be established at the same time, the more the utilization rate can be improved, and the increase in transmission capacity in each mobile communication device. Can be achieved.

According to the sixteenth aspect of the present invention, when the fixed station communication device receives the link identification code from the mobile communication device that has entered the communication area and establishes a link, the mobile communication device thereafter transmits the link identification code. Since the communication process is controlled using a plurality of link identification codes, the communication process is performed at a higher data transmission speed than the communication process performed by one link identification code. Accordingly, the same effect as described above can be obtained.

According to the seventeenth aspect of the present invention, in the above-mentioned case, a plurality of link identification codes are received from a mobile communication device that has entered a communication area, and a link identification code usable for the mobile communication device is used. When the link processing for communicating with the communication is established, control is performed so that the communication processing is performed by using the link identification code which can be used thereafter, whereby the data transmitted through each link identification code is designated. Since the data is assembled by combining them in order, as described above, even if the data received for each link identification code has a temporal sequence, it can be reliably restored. .

According to the eighteenth aspect of the present invention, in the configuration of the fifteenth to seventeenth aspects, the communication control means establishes a link process so that the mobile communication device performs communication using a plurality of link identification codes. In this case, data to be transmitted to the mobile communication device is divided into communication processing units using a plurality of link identification codes and transmitted, so that the transfer amount of data to be transmitted to the mobile communication device is large. In this case, efficient transmission processing with an increased transfer speed can be performed.

According to the nineteenth aspect of the present invention, when a plurality of mobile communication devices can perform communication processing using different link identification codes, the application processing device uses the data processing means to execute the plurality of mobile communication devices. Each mobile communication device transmits and receives application-related data to and from a fixed-station communication device by transmitting and receiving data related to an application via the mobile communication device. The communication process can be performed in a state where the data transmission speed is higher than the communication process in the case where the communication process is performed.

Thus, when the amount of data transmission and reception increases depending on the application, a vacant portion of the usable communication capacity can be secured by establishing the link processing using the link identification code. Can be performed efficiently. In addition, this means that in a fixed station communication device, the number of link identification codes that can establish a link at the same time is set to be larger, the utilization factor can be improved, and individual mobile communication devices can be improved. In, the transmission capacity can be increased.

According to the twentieth aspect of the present invention, when transmitting data relating to an application, the application processing device divides the plurality of mobile communication devices into usable link identification codes by the data processing means. Then, the data transmission processing is performed, so that the data transmission speed by one application processing apparatus can be increased and efficient communication processing can be performed.

According to the twenty-first aspect of the present invention, when receiving data related to an application, the application processing device combines data received from the fixed station communication device through the plurality of mobile communication devices in a specified order. Therefore, even if the data received from each mobile communication device has a temporal order, it can be surely restored.

According to the twenty-second aspect of the present invention, when performing communication with a fixed station communication device by a mobile communication device, a plurality of link identification codes are used to perform link processing with the fixed station communication device. The data transmission process is performed using the link identification code established by the link process, so that the data transmission process can be performed efficiently within the communicable capacity and the data transmission speed by the mobile communication device can be increased. Thus, efficient data transmission processing can be performed.

According to the twenty-third aspect, when communication is performed between the mobile communication device and the fixed station communication device, a link is established by performing link processing with the fixed station communication device using the link identification code. After that, the data transmission process is performed between the mobile communication device and the fixed station communication device by using a plurality of link identification codes, so that the efficient data transmission process can be performed within the communicable capacity range. ,
It is possible to perform an efficient data transmission process with an increased data transmission speed by the mobile communication device.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment in which the present invention is applied to an in-vehicle device of an automatic toll collection system performing DSRC communication will be described with reference to FIGS. I will explain while. FIG. 2 shows a schematic configuration of the present embodiment. The vehicle-mounted device 1 includes, for example, four link identification codes LID (Link ID) 1-4.
Can be set, and communication control described later is performed by a communication processing circuit 1a which is communication control means provided inside. The communication processing circuit 1a includes a CPU, a ROM, a RAM, and the like, and performs communication control according to a communication processing program.

The vehicle-mounted device 1 is configured to internally perform communication processing for automatic toll collection, and is configured to be able to mount an IC card (not shown) for toll settlement. Further, the vehicle-mounted device 1 is configured to be able to transmit transfer data from an externally connected application processing device 2 as another communication processing operation. The application processing device 2 is, for example, a car navigation device for distributing navigation map data, a terminal device connectable to the Internet, or a digital music distribution device for downloading and reproducing music information and the like.

The on-vehicle device 1 is installed, for example, on the dashboard of an automobile. When the vehicle is traveling on a toll road or the like, the roadside device 3 is a fixed station communication device provided at a toll gate or the like. Communication is performed within the communication area. In this case, the communication process between the two is ARIB
-A configuration in which communication is performed by the DSRC method conforming to STD-55.

According to the DSRC communication standard, a roadside device has a narrow area communication zone covering a limited area of a road, and data transmission between the roadside device and the roadside device while the mobile vehicle-mounted device passes through the communication zone. It defines a communication control procedure to be performed to achieve the above. The outline of the communication method is based on the synchronous adaptive slotted Aloha communication control procedure suitable for point-to-point, short-time, two-way communication between multiple mobile on-board units and roadside units. . Further, half-duplex communication is fundamental, and when different frequencies are used for uplink and downlink, a communication control method that allows full-duplex communication is specified.

The communication frame slot includes an FCMS (Frame Control Message Slot) for allocating slots, an MDS (Message Data Slot) for data transfer, and an A for entry (association) to the communication link of the roadside device.
The configuration is made up of CTS (Activation Slot).

FIG. 3 shows a protocol model for performing communication between the vehicle-mounted device 1 and the roadside device 3. D
The SRC protocol uses a layer 1 (hereinafter referred to as L1) (Physical Medium Layer) and a layer 2 (Data Link Layer: Data Link) according to an OSI (Open Systems Interconnection) layer model for open system type interconnection. Layer: L2) and layer 7 (hereinafter referred to as L7) (application layer: Application La
yer). Layer 2 further includes a logical link control sub layer LLC (Logical Link Control Sub Layer).
er) and the medium access control sublayer MAC (Medium Access Co
ntrol Sub Layer).

The vehicle-mounted device 1 transmits the data to be transmitted given from the application processing device 2 through four data channels.
In LLC, MAC, and L1, the MPDU (MAC Protocol Data Unit) received from the MAC layer is stored in M for each LID.
It has a function of transmitting and receiving in accordance with a DS (Message Data Slot).

Next, the contents of the link processing will be described with reference to the flowchart shown in FIG. The vehicle-mounted device 1
When trying to establish a plurality of links, the number of requested data channels is first set to N before starting communication.
(Here, N = 4) is set (step S1), and LID1 to LID4 corresponding to the N data channels are set as
It is generated and stored by a generation method based on random numbers (step S2).

Next, when the vehicle-mounted device 1 enters the communication area of the roadside device 3, the vehicle-mounted device 1 receives an FCMC (Frame Control Message Chan- nel).
nel) (step S3), and the received FCM
LID1 to LID generated in step S2 during C
It is checked whether or not an MDS (Message Data Slot) exists for Step 4 (Step S4). Here, still ACT
LID because C (ACTivation Channel) is not transmitted
No MDS exists for any of 1 to LID4 (steps S4 and S5 are repeated to reach step S6). FIG. 4 shows the process of transmitting and receiving signals.
The vehicle-mounted device 1 receives the FCMC transmitted from the roadside device 3,
The exchange for transmitting the ACTC is shown in FIG.

When all the LIDs have been checked, the vehicle-mounted device 1 subsequently sends the received FCMC an ACT.
It is checked whether or not C (ACTivation Channel) has been allocated (step S6). If ACTC has been allocated, N (= 4) ACTS (ACTivationSlot) are assigned.
) LID1 to LID4 are transmitted in the ACTC (step S7), and the process returns to step S3.

Thereafter, the FCMC is received again (FIG. 4).
(Reception of FCMC from the roadside device shown in (b)) It is sequentially determined whether or not the MDS corresponding to the transmitted LID1 to LID4 exists therein (steps S4 and S5). If an MDS exists, it is determined that a channel link can be established for the LID, and the set N is reduced by "1" (step S8). If N is not "0", the remaining N is not set. Then, it is determined whether or not an MDS exists for the LID.

Hereinafter, by repeatedly executing the above-described processing (steps S3 to S7), all the LID1 to LID
When the MDS corresponding to ID4 exists, four channels are secured by the four LID1 to LID4, and the value of the variable N also becomes “0” (step S9). This program will end.

On the other hand, when the roadside device 3 receives the ACTC from the vehicle-mounted device 1, it assigns an MDS to each of the LID 1 to LID 4 and transmits a BST (Beacon Service Table) using the assigned MDS. (FIG. 4 (b), transmission of BST after FCMC transmission) and VST (Vehicle Service Talbe) reception (FIG. 4 (c), reception of VST from vehicle-mounted device 1). Establish links to LID1 to LID4.

Here, the BST is data indicating the service contents (for example, there are applications such as distribution of navigation map data and download of the Internet or music information in addition to the application of automatic toll collection) on the roadside device 3 side. In this case, since the ACTC is simultaneously received from the vehicle-mounted device 1, the same information is individually transmitted to all the LIDs 1 to 4. The VST is for transmitting data indicating the contents of an application that can be handled by the on-vehicle device 1. Here, the same information is simultaneously transmitted to all the LIDs 1 to 4 similarly to the roadside device 3. Will do.

At this time, if a link to another on-vehicle device is established and MDS assignment cannot be made to correspond to all of the requested LIDs, the BST is transmitted for the assigned MDS. Do. LIDs that could not be assigned are discarded. Thereafter, if MDSs can be allocated to the requested LIDs, the BIDs are sequentially allocated and the BST is transmitted.

Next, when a link to the LID is established, this is notified to the data channel unit, and the data channel is set on the vehicle-mounted device 1 using, for example, a Get primitive.
Is read as attribute data for specifying the attribute. Specifically, the Get. A req (get request) is transmitted corresponding to each of the LIDs 1 to 4 (see FIG. 4D).

On the other hand, Ge transmitted from the vehicle-mounted device 1
t. By receiving an rsp (get response) (see (e) in the figure), it is confirmed that the multi-channel communication is performed by the same vehicle-mounted device 1 based on the content of the attribute of the received signal (except for the attribute reading by the Get primitive). This may be confirmed by a method, for example, an Action primitive.) This allows
A data channel is established between the roadside device 3 and the vehicle-mounted device 1,
Doing this for each LID establishes multiple data channels.

FIG. 6 shows that the vehicle-mounted device 1 transmits
FIG. 3 shows an example in which data transmission is performed using the number of data channels. In this figure, the DSR shown in FIG.
The layer 7 and the logical link control sublayer LLC of the C protocol are omitted. In FIG. 6, when the data channel is established, the vehicle-mounted device 1 divides the application data to be transferred provided from the application processing device 2 into an appropriate size. The division size at this time is LPDU (Link Protocol Data Unit).
) It is necessary to determine according to the length, but since the maximum length of the LPDU is 512 octets, it is necessary to finally divide the LPDU into a size not exceeding this.

At the beginning of the divided data, additional information including a sequence number, a data length, and the like for restoring the data by the application on the other end is added to create channel divided data. The created channel division data is passed to each of the four data channels. The data channel transfers the received channel division data to the data channel of the roadside device 3 using the Action primitive of the DSRC protocol for each LID.

Here, the exchange using the Action primitive is performed, for example, as shown in FIG. req (action request), and upon receipt of the request, the vehicle-mounted device 1 sends Act. rsp
(Action response) and transfer. Note that, in this case, the on-vehicle device 1 transmits the Act. rsp is transferred by FCMC using three frames ((b) in FIG.
To (d)).

The DSRC protocol has four independent transfer protocol parts for each LID and executes the primitives received from the data channel. In the DSRC protocol, PDUs, which are data units, are exchanged for each layer. The LPDU passed from the LLC layer to the MAC layer is divided into 65 octet units in the MAC layer, and becomes an MPDU (MAC Protocol Data Unit). .
The divided MPDU is passed to L1.

L1 receives respective MPDUs from the protocol portion for four channels, but LID1 to LID
MPDU with MDS allocated to each of
Is transmitted. Thereby, the vehicle-mounted device 1 has four MDs.
S can be used simultaneously to perform data transfer.

When the roadside device 3 receives the MDC, the MDC is passed to the MAC layer corresponding to the LID, and the LPDU is assembled in each MAC layer. When the assembly of the LPDU is completed, the received data is sequentially passed to the upper layer protocol, and finally the data channel on the roadside device receives the channel divided data.

Since the channel division data does not always arrive in the order of transmission by the application on the partner side due to the DSRC communication status, when the application receives the channel division data, the application assembles the application data based on the sequence number and the data length added to the head. I will do.

FIG. 7 shows a retry process in the above case, for example, when a communication error occurs in the data channel of LID3. In this case, multiple MDs
Since each of S is transferred by the corresponding LID, the communication does not stop unlike the case of performing by one LID.

That is, in the case where the communication system of the present invention is adopted, in the communication performed by the part specified by the DSRC protocol after dividing the application data into four data channels, the part that changes the standard is Therefore, the communication method itself is performed corresponding to each LID. Then, when a retry occurs in each LID, the MDC that could not be transferred by performing a retry process on the data channel is transmitted again.

For example, in the case of FIG. 7, when a communication error occurs in L1 (Layer 1) in the data channel using LID3 and the roadside device 3 cannot receive the MDC3, Failed in the next frame, and in the next frame the same M
DC3 is transferred again.

As described above, the order of the transfer data for each LID is passed to the MAC layer corresponding to the LID based on the sequence number added to the head, and the LPDU is assembled in each MAC layer. When the assembling of the LPDU is completed, the received data is sequentially passed to the upper-layer protocol, and finally the data channel of the roadside device receives the channel divided data.

Because the channel division data does not always arrive in the order of transmission by the application on the partner side due to the DSRC communication status, when the application receives the channel division data, the application assembles the application data based on the sequence number and the data length added to the head. I will do. Thus, even when a retry due to a communication error occurs, application data can be finally received without being affected by the retry.

According to the present embodiment, the data to be transferred received from the application processing apparatus 2 can be divided and transferred by the four data channels using the four LID1 to LID4. When there are a plurality of slots constituting a communication frame in the roadside device 3, communication with an increased transfer capacity can be performed by effectively using the available channels. Also in this case, there is no need to change the conventional method in the portion to which the DSRC protocol is applied, so that reliability can be ensured.

In order to verify the effect of the present invention, the inventor made the following trial calculation and compared it with the conventional configuration. That is, the calculation of the data transfer rate with respect to the number of MDSs used simultaneously in one frame was performed as follows. Here, one frame is constituted by the number of slots obtained by adding the number of MDSs set in the FCMS positioned at the head. Further, as shown in FIG. 8, the time of one slot is, for example, 781.25 μs, and the data length is calculated as 65 bytes. FIG.
-1) and (a-2) show the case of two MDSs, showing the case of the present embodiment and the case of the conventional method. Similarly, (b-1), (a-2)
(B-2) indicates that (c-1) and (c-
2) shows a case where the number of MDS is eight.

(1) When only 1 MDS is used at 3 slots / frame (corresponding to (a-2)) 65 bytes / (781.25 μs × 3) = 27.7 kbytes / s = 221.8 kbi
t / s (2) When 2 MDS is used at 3 slots / frame (corresponding to (a-1)) 65 bytes × 2 / (781.25 μs × 3) = 55.4 kbyte / s = 443.
7 kbit / s (3) When 4 MDS is used with 5 slots / frame (equivalent to (b-1)) 65 bytes x 4 / (781.25 μs x 5) = 66.56 kbytes / s = 532.
48 kbit / s (4) When 8 MDS is used at 9 slots / frame (corresponding to (c-1)) 65 bytes × 8 / (781.25 μs × 9) = 73.96 kbyte / s = 591.
64kbit / s

As a result of the trial calculation as described above, it can be seen that the capacity of the transfer data has been greatly increased. MD in that frame
Data transfer speed according to the number of S used (kbit / s)
Obtained the results as shown in FIG.

In the figure, the horizontal axis represents the number of slots constituting a frame, and the vertical axis represents the data transfer rate (kbit / s). From this result, in the case of the conventional system, as shown by the black circle, M for one slot in one frame
Since only DS is used, the amount of transfer data per frame decreases as the number of slots constituting one frame increases, and the data transfer rate tends to decrease.

On the other hand, when the present invention is adopted, as shown by the white circles in the figure, when the number of slots constituting one frame increases, the number of slots that can be used in one frame increases accordingly, and The transfer speed increases. In addition, the available slots can be effectively used within the range according to the use status of the slots by other vehicle-mounted devices, so that the use efficiency can be improved.

Actually, with regard to the data transfer rate shown in the above-described calculation results, since a header of several bytes is added to each MDC, a discrepancy occurs between the size of the MDC and the transfer data size, and the throughput is increased. Is slightly lower than this. In addition, since the uplink transfer requires a request from the roadside, the throughput is further reduced, but the data transfer speed can be substantially improved substantially.

(Second Embodiment) FIG. 10 shows a second embodiment of the present invention.
This embodiment is different from the first embodiment in that a toll collection device 2a, a navigation device 2b, an MD (Mini Disk)
) The player 2c is connected to the vehicle-mounted device 1.

The vehicle-mounted device 1 comprises three application processing devices, a toll collection device 2a and a navigation device 2
b, corresponding to the MD player 2c, the data input from each is assigned to each LID and used for data transfer. A communication processing circuit 1b provided as communication processing means is provided therein. The communication processing circuit 1b performs data transfer processing corresponding to each of the toll collection device 2a, the navigation device 2b, and the MD player 2c. The functions have been split.

The communication processing circuit 1b assigns LID1 to the toll collection device 2a,
b is assigned LID2, and MD player 2c is assigned LI.
D3 is allocated, and data transfer processing is performed for each application using the LID1 to LID3. In this case, if all the application processing apparatuses 2a to 2c are used, three LIDs 1
~ Perform data transfer processing using all LID3,
For example, when the MD player 2c is not used,
Data transfer processing is performed without using LID3.

According to the second embodiment, data transfer processing is performed by allocating LID1 to LID3 corresponding to each of the application processing apparatuses 2a to 2c, so that all LIDs can be used. In this case, the required data transfer rate can be secured, rapid communication processing can be performed regardless of the amount of data to be transferred, and efficient use of available slots can be achieved. Good data transfer processing can be performed.

In the second embodiment, an LID is assigned to each application processing device in association with each other. Alternatively, one LID may be assigned according to the amount of data handled by the application processing device. Or a plurality of LIDs may be set differently. For example, with regard to the MD player 2c or the like that handles a large amount of data in the application processing apparatus, flexible association can be performed by allocating two LIDs and performing data transfer processing.

When the amount of data to be transferred may differ depending on the time, not the type of the application processing apparatus, the maximum value of the number of LIDs to be used is flexibly set according to the amount of data generated. May be configured. It should be noted that the number of LIDs that can be actually used with respect to the set number of LIDs is not always determined whether or not the number is satisfied, but is determined by the availability of slots in the roadside device 3.

Without associating a plurality of application processing devices with the LIDs to be used, all the transfer data are combined once at the time of data transfer, and are combined into a set of data for each of a plurality of LIDs so as to handle one application. It is also possible to adopt a configuration in which data transfer processing is performed in a divided manner.

(Third Embodiment) FIG. 11 shows a third embodiment of the present invention.
This embodiment is different from the first embodiment in that, instead of the vehicle-mounted device 1, a plurality of (4a to 4d) DSRC vehicle-mounted devices 4 having a configuration used in the related art are used. Instead of the application processing device 2, an application processing device 5 having a data dividing means 5a is provided.

In this configuration, the data dividing means 5a as the data processing means of the application processing device 2
Has the same function as the communication control means of the vehicle-mounted device 1 in the first embodiment, and transfers data to be transferred generated by the execution of the application to the four vehicle-mounted devices 4a to 4d.
It is to be divided and given. At this time, additional information including a sequence number, a data length, and the like is added to the head of each of the divided transfer data, and is thus given to each of the on-vehicle devices 4a to 4d as channel division data. As a result, each of the on-vehicle devices 4a to 4d performs data transfer processing to the roadside device 3 according to the same DSRC protocol as in the related art. In the same way as described above, the roadside device 3 can restore the original data regardless of the transfer order by assembling the received data and passing it to the higher-level protocol.

Further, each of the on-vehicle devices 4a to 4d
When you receive data that is divided and sent to
The data processing circuit 5a of the application processing device 5 assembles the received data and restores the original data.

According to the third embodiment, the same operation and effect as those of the first embodiment can be obtained by using the application processing device 2. At this time, the vehicle-mounted devices 4a to 4d It is not necessary to use a device having a special specification, and it is possible to cope with the problem by preparing a plurality of devices having the same type of conventional configuration. Data transfer processing can be performed.

In the above embodiment, full-duplex transmission in which communication is performed by simultaneously using the uplink MDS and the downlink MDS becomes possible. As a result, up to twice the number of MDCs can be used simultaneously, and the number of data channels can be doubled. This function may be realized by making the on-vehicle devices 4a to 4d correspond to full-duplex communication.

Further, when the on-vehicle devices 4a to 4d are capable of only half-duplex communication, the roadside device 3 uses a half-duplex frame so that the MDS for uplink and the MDS for downlink are not used at the same time. There is a need. Onboard equipment 4a-4
If d is capable of full-duplex communication, the roadside device 3 may use twice as many data channels using full-duplex communication frames.

(Fourth Embodiment) FIG. 12 shows a fourth embodiment of the present invention.
The first embodiment is different from the first embodiment in that the link processing performed first by the vehicle-mounted device 1 and the roadside device 3 is performed by using only one LID. After the link to the roadside device 3 is established, the vehicle-mounted device 1 generates a plurality of LIDs, transmits the LID to the roadside device 3, and uses the available MIDs.
LID is assigned to each MDS using DS, and roadside machine 3
The difference is that communication processing is performed between the two.

That is, the vehicle-mounted device 1 generates a usable LID in advance and stores it in an internal attribute. When the vehicle-mounted device 1 enters the communication area of the roadside device 3, it executes the link sequence shown in FIG. Become. In the process of establishing this link, the vehicle-mounted device 1 performs link processing in the same manner as in the related art, receives the FCMC, and receives the received FMC.
After confirming that the above-mentioned LID does not exist in the CMC, the ACTC is transmitted. After that, BS from the roadside machine 3 side
T is transmitted, and the vehicle-mounted device 1 that has received this transmits VST to establish a link.

When the link sequence is completed, the process proceeds to a negotiation sequence. Here, after the roadside device 3 transmits the FCMC to the on-vehicle device 1,
t. Send req primitive. On the other hand, the vehicle-mounted device 1 reads the above-mentioned attribute and obtains the Get. r
The list of LIDs is transmitted as sp. Here, the vehicle-mounted device 1 generates a plurality of LIDs as a list of LIDs by using the LID used when the link is first established and changing the extension that is the specific bit. Send as

The extension of the LID is changed, for example, as follows. LID defined by DSRC protocol
Uses a 32-bit value of 4 octets, of which the four bits located at the beginning of each octet are extensions or prescribed bits. By changing these, the original A maximum of 16 LIDs including the LID can be generated. Of these, LIDs used for communication processing are generated and used.

Next, the roadside device 3 refers to the received list of LIDs and selects the smaller of the number of channels and the number of currently available channels on the roadside device 3 side. Is selected and the vehicle-mounted device 1 is set. Send req primitive. Upon receiving this, the vehicle-mounted device 1 sets the received LID in the attribute, determines the LID to be used for communication with the roadside device 3 based on the LID of the number of channels, and determines this in Se.
t. This is transmitted to the roadside device 3 as rsp, and the negotiation sequence is completed as described above.

Next, the process proceeds to the data transfer sequence, and the roadside device 3 transmits the Action. re
With the q primitive, for example, communication processing of data transfer is performed using LIDs 1 to 4 used corresponding to four MDSs. The on-vehicle device 1 responds to this by using Action. r
The data is transferred by LID1 to 4 corresponding to each MDS by sp. As described above, when the data transfer sequence ends, the communication processing ends.

According to such a fourth embodiment, the on-vehicle device 1 establishes a link with the roadside device 3 using one LID, and then uses the plurality of LIDs to establish a link. Is performed using a different MDS, so that the same effects as in the first embodiment can be obtained, and the link can be established while the link processing method is the same as the conventional simple processing. Later, using a plurality of LIDs, the empty channel can be effectively used to secure the data transfer capacity. In the above case, a plurality of LIs
Since the generation of D is performed by changing a specific bit,
The LID can be generated easily and quickly.

(Other Embodiments) The present invention is not limited to the above embodiment, but can be modified or expanded as follows. In the above-described embodiment, the case where the number of LIDs is set in advance has been described. However, the set number is not always maximized according to the capability of hardware or setting conditions, but is variably set depending on the case. You may do it. Also, it may be set variably according to the content of the software to be used.

[0092] In addition to the above-mentioned ones, the application processing apparatus can transmit various information such as a personal computer that exchanges data using the Internet or e-mail, a terminal device that handles music information and video information, or road information. Any device that handles data exchanged via a mobile communication device, such as a device that exchanges data, can be applied.

[Brief description of the drawings]

FIG. 1 is a flowchart of a link processing program according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing a schematic configuration of a system.

FIG. 3 is a conceptual diagram showing a protocol model.

FIG. 4 is a time chart showing a sequence of link establishment.

FIG. 5 is a time chart showing a data transfer sequence.

FIG. 6 is an explanatory view showing a process of transferring application data (part 1);

FIG. 7 is an explanatory view showing a process of transferring application data (part 2);

FIG. 8 is an explanatory diagram of a model used for verification.

FIG. 9 is a correlation diagram showing a trial calculation result of a data transfer rate according to the number of MDSs used with respect to the number of slots constituting one frame.

FIG. 10 is a view corresponding to FIG. 2, showing a second embodiment of the present invention;

FIG. 11 is a view corresponding to FIG. 2, showing a third embodiment of the present invention;

FIG. 12 is a sequence diagram of a communication process according to a fourth embodiment of the present invention.

FIG. 13 is a diagram corresponding to FIG. 7 showing a conventional example.

[Explanation of symbols]

1 is a vehicle-mounted device (mobile communication device), 1a and 1b are communication control circuits (communication control means), 2 and 5 are application processing devices, 2a is a toll collection device (application processing device), and 2b is a navigation device (application processing device). Devices, 2c is an MD player (application processing device), 3 is a roadside device (fixed station communication device), 4a to 4d are on-vehicle devices, and 5a is a data processing circuit (data processing means).

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference)

Claims (23)

[Claims] 1. When a user enters a communication area of a fixed station communication device, it transmits its own link identification code and performs link processing for communication with the fixed station communication device. A mobile communication device comprising communication control means for controlling communication processing using a communication identification code, wherein the communication control means uses a plurality of link identification codes to perform communication with the fixed station communication device. A mobile communication device that performs a link process using the link identification code established by the link process. 2. When entering the communication area of the fixed station communication device, the base station transmits its own link identification code and performs link processing for performing communication with the fixed station communication device. A mobile communication device having communication control means for controlling communication processing using a communication identification code, the communication control means comprising: A mobile communication device, wherein the communication process is performed with the fixed station communication device by using each of the identification codes. 3. The mobile communication device according to claim 1, wherein the communication control unit, when receiving data to be transmitted from one or a plurality of application processing devices, transmits the data to the plurality of links. A mobile communication device characterized in that the mobile communication device is configured to be divided into communication processing units to be performed using an identification code for transmission. 4. The mobile communication device according to claim 1, wherein the communication control unit is configured to transmit the plurality of link identification codes according to a capacity of data to be transmitted from the application processing device. A mobile communication device, wherein the number is set. 5. The mobile communication device according to claim 1, wherein the communication control unit, when receiving data to be transmitted from a plurality of application processing devices, transmits the plurality of link identification codes to the application. A mobile communication device, wherein the mobile communication device is configured to transmit the data to be transmitted by allocating the data in units of processing devices. 6. The mobile communication device according to claim 5, wherein the communication control unit transmits a plurality of link identification codes when a capacity of data to be transmitted from the application processing device is equal to or larger than a predetermined value. A mobile communication device configured to transmit the data to be transmitted by being allocated to an application processing device. 7. The mobile communication device according to claim 1, wherein the communication control unit sets a number of the plurality of link identification codes as a maximum usable number, and a range of the number. A mobile communication device configured to transmit data by using a link identification code that can be used with the fixed station communication device within the mobile communication device. 8. The mobile communication device according to claim 7, wherein the communication control unit uses a link that can be used with the fixed station communication device for the set plurality of link identification codes. A mobile communication device configured to execute the communication processing while judging that an unused link identification code becomes available when the number of link identification codes is small. . 9. The mobile communication device according to claim 1, wherein the communication control unit performs a DS communication with the fixed station communication device.
A mobile communication device which is mounted on an on-vehicle device that performs communication by a RC (Dedicated Short Range Communication) method. 10. The mobile communication device according to claim 9, wherein the communication control unit stores the plurality of link identification codes in a plurality of MDSs (Messages) following a frame control message slot (FCMS). Data Slot)
A mobile communication device that performs the communication process using different ones of the mobile communication devices. 11. The mobile communication device according to claim 9, wherein the communication control unit transmits the F transmitted by the fixed station communication device.
The CMS (Frame Control Message Slot; slot allocation information) is received to obtain information on empty slots, and the link identification code corresponding to the number of empty slots is transmitted based on the empty slot information to execute the link processing. A mobile communication device characterized in that the mobile communication device is configured to perform the operation. 12. The mobile communication device according to claim 11, wherein the communication control means transmits the F transmitted by the fixed station communication device.
When a CMS (Frame Control Message Slot; slot allocation information) is received and there is no MDS (Message Data Slotd) corresponding to the transmitted link identification code in the received CMS, the link identification code is transmitted again. A mobile communication device configured to repeatedly execute until the next received FCMC includes the MDS corresponding to the link identification code. 13. The fixed station communication device according to claim 1, wherein said communication control means establishes a link process using a plurality of link identification codes. A mobile communication device configured to combine data received from each of the link identification codes in a specified order to assemble the data. 14. The mobile communication device according to claim 1, wherein said communication control means changes a plurality of link identification codes by changing a specific bit in one link identification code. A mobile communication device characterized by generating. 15. When a link identification code is received from a mobile communication device that has entered a communication area, a link process for performing communication with the mobile communication device is performed. A fixed station communication device comprising communication control means for controlling communication processing by using a plurality of link identification codes, wherein the communication control means performs link processing so that the mobile communication device performs communication using a plurality of link identification codes. Is established, the mobile communication device is configured to perform the communication process using a plurality of link identification codes for which the links have been established. . 16. When a link identification code is received from a mobile communication device that has entered a communication area, a link process for performing communication with the mobile communication device is performed. A fixed station communication device comprising communication control means for controlling communication processing using the mobile communication device, when the mobile communication device establishes the link processing, the mobile communication device A fixed station communication device, wherein the communication process is performed by using a plurality of link identification codes from the device. 17. The fixed station communication device according to claim 15, wherein the communication control means establishes link processing so that the mobile communication device performs communication using a plurality of link identification codes. In this case, the fixed station communication device is configured to assemble data by combining data transmitted through each link identification code in a specified order. 18. The fixed station communication device according to claim 15, wherein said communication control means establishes link processing so that said mobile communication device performs communication using a plurality of link identification codes. Wherein the data to be transmitted to the mobile communication device is divided into communication processing units using the plurality of link identification codes and transmitted. . 19. When entering the communication area of the fixed station communication device, the terminal transmits its own link identification code and performs link processing for communicating with the fixed station communication device. An application processing device for transmitting and receiving data relating to an application through a mobile communication device that controls communication processing using a communication identification code, comprising a plurality of the mobile communication devices, each using a different link identification code. Data processing means for transmitting and receiving data relating to the application using the plurality of mobile communication devices when communication processing is possible. 20. The application processing apparatus according to claim 19, wherein the data processing unit is configured to perform data processing on the application when communication processing can be performed using different link identification codes through the plurality of mobile communication apparatuses. An application processing device, wherein the application processing device is configured to perform a communication process by the mobile communication device by dividing each of the available link identification codes. 21. The application processing apparatus according to claim 19, wherein the data processing unit performs each mobile communication when communication processing is possible using different link identification codes through the plurality of mobile communication apparatuses. An application processing device configured to assemble data by combining data relating to an application transmitted through a link identification code of a body communication device in a specified order. 22. A mobile communication device that has entered a communication area of a fixed station communication device transmits its own link identification code and performs link processing for communication with the fixed station communication device. Thereafter, in a communication method of a mobile communication device which controls to perform a communication process using the link identification code, the communication control means uses a plurality of link identification codes to perform the fixed station communication. A communication method for a mobile communication device, comprising: performing a link process with a device; and performing the communication process using a link identification code established by the link process. 23. A mobile communication device that has entered the communication area of a fixed station communication device transmits its own link identification code and performs link processing for communication with the fixed station communication device. Thereafter, in a communication method of a mobile communication device that controls to perform a communication process using the link identification code, the communication control unit includes a plurality of communication devices after a link is established with the fixed station communication device. A communication method for a mobile communication device, wherein the communication process is performed with the fixed station communication device using each of the link identification codes.