CN116052294A

CN116052294A - ETC communication method, computer device, and storage medium

Info

Publication number: CN116052294A
Application number: CN202310009847.5A
Authority: CN
Inventors: 熊江波; 杜水荣; 王家军; 郭佳佳; 谢智文; 陈仰华; 尤俊勇; 钟香; 吴文佳
Original assignee: Shenzhen Genvict Technology Co Ltd
Current assignee: Shenzhen Genvict Technology Co Ltd
Priority date: 2023-01-04
Filing date: 2023-01-04
Publication date: 2023-05-02

Abstract

The invention discloses an ETC communication method, a computer device and a storage medium, wherein the ETC communication method comprises the following steps: transmitting a control frame in a current communication period, wherein the control frame comprises control information of a plurality of time windows of the current communication period; when the special time window exists in the current communication period, according to the control information, corresponding data frames are sent to corresponding communication equipment or corresponding data frames are received from the corresponding communication equipment in the corresponding special time window; when the common time window exists in the current communication period, receiving a frame response message sent by an OBU which does not establish a communication link in the common time window, establishing the communication link with the OBU, distributing a special time window for the OBU in the next communication period, and updating a control frame of the next communication period. By implementing the technical scheme of the invention, the RSU can simultaneously communicate with a plurality of communication devices, thereby improving the speed, efficiency and bandwidth of ETC communication and meeting the application of various expansion scenes.

Description

ETC communication method, computer device, and storage medium

Technical Field

The present invention relates to the field of intelligent transportation, and in particular, to an ETC communication method, a computer device, and a storage medium.

Background

With the development of ETC applications, the scale of users is continuously enlarged, the scenes of ETC extended applications are continuously increased, the functions of ETC products are becoming more and more complex, the communication rate of the current ETC can only meet the requirements of transaction fee deduction applications and some simple scene identifications, applications (including but not limited to a large amount of text, picture, voice, video and other information transmission) of various extended scenes are not met, and higher requirements are put forward for meeting the requirements of the applications of various extended scenes on the rate, efficiency and bandwidth of ETC communication.

Disclosure of Invention

The invention aims to solve the technical problem that the prior art cannot meet the application of an expansion scene, and provides an ETC communication method, computer equipment and a storage medium.

The technical scheme adopted for solving the technical problems is as follows: an ETC communication method is constructed and applied to an RSU, and comprises the following steps:

a control frame transmitting step: transmitting a control frame in a current communication period, wherein the control frame comprises control information of a plurality of time windows of the current communication period, and the plurality of time windows comprise: a dedicated time window allocated for at least one communication device having established a communication link and/or at least one common time window not allocated;

a first transceiving step: when the special time window exists in the current communication period, according to the control information, corresponding data frames are sent to corresponding communication equipment or corresponding data frames are received from the corresponding communication equipment in the corresponding special time window;

a control frame updating step: when the common time window exists in the current communication period, receiving a frame response message sent by an OBU which does not establish a communication link in the common time window, establishing the communication link with the OBU, distributing a special time window for the OBU in the next communication period, and updating a control frame of the next communication period.

Preferably, the step of transmitting the control frame in the current communication period includes:

the control frames are transmitted on a plurality of channels of the current communication period, respectively.

Preferably, after the step of transmitting the respective data frame to the respective communication device, it comprises:

judging whether the duration of not receiving the confirmation message from the corresponding communication equipment exceeds the preset time;

and when the preset time is exceeded, disconnecting the communication link with the corresponding communication equipment, releasing the special time window allocated for the corresponding communication equipment, and updating the control frame of the next communication period.

Preferably, the frame response message includes priority information;

the step of allocating a dedicated time window for the OBU in the next communication cycle includes:

and preferentially distributing a special time window for the OBU in the next communication period according to the priority information.

Preferably, the frame response message includes application type information;

and determining the length of the special time window allocated to the OBU in the next communication period according to the application type information, and allocating the special time window to the OBU in the next communication period according to the length.

The invention also constructs an ETC communication method, which is applied to the OBU and comprises the following steps:

a control frame receiving step: receiving a control frame sent by an RSU in a current communication period in a current channel, and acquiring control signals of a plurality of time windows of the current communication period by analyzing the control frame

The plurality of time windows includes: a dedicated time window of 5 allocated for at least one communication device having established a communication link and/or at least one common time window not allocated;

judging: judging whether a time window allocated for the OBU exists in the plurality of special time windows or not;

and a second transceiving step: if so, sending a corresponding data frame to the RSU or receiving a corresponding data frame from the RSU in a corresponding special time window according to the control information; and 0, establishing a link: if not, then in a common time window, sending a frame response cancellation to the RSU

And the RSU establishes a communication link with the OBU after receiving the frame response message, and allocates a special time window for the OBU in the next communication period to update the control frame of the next communication period.

Preferably, the RSU transmits control frames on a plurality of channels of a current communication period, respectively;

moreover, the ETC communication method further includes:

5 if the current channel is busy, switching the current channel and re-executing the control

And a frame receiving step.

Preferably, the step of acquiring control information of a plurality of time windows of the current communication period includes:

acquiring control information of a plurality of time windows of each channel in a current communication period;

moreover, the step of switching the current channel includes: 0 randomly selecting a channel and switching the current channel; or alternatively, the process may be performed,

and selecting an idle channel according to the control information of a plurality of time windows of each channel in the current communication period, and switching the current channel.

Preferably, the step of sending a frame response message to the RSU during a common time window includes:

and in the public time window, delaying for a random time, and then sending a frame response message to the RSU.

The invention also constructs a computer device comprising a memory and a processor connected to the memory; the memory is used for storing a computer program; the processor is configured to run a computer program stored in the memory to perform the steps of the ETC communication method as described above.

The present invention also constructs a storage medium storing a computer program which, when executed by a processor, implements the steps of the ETC communication method as set forth in any one of the above.

By implementing the technical scheme of the invention, as the RSU can autonomously allocate the time window (special time window) of communication of each communication device in the area according to the communication state in the current communication area, and can also reserve the time window (public time window) of quick access of the communication device, for the OBU in the communication area of the RSU, after receiving the control frame sent by the RSU in the current communication period, the control information of a plurality of time windows in the current communication period can be obtained by analyzing the control frame, and if the OBU has established a communication link with the RSU, the data frame can be sent to the RSU in the corresponding special time window, or the corresponding data frame can be received from the RSU; if the OBU is a newly accessed OBU, i.e. a communication link has not been established with the RSU, it may return a frame response message to the RSU in a common time window to wait for the RSU to allocate a dedicated time window for it in the next communication cycle. Therefore, the RSU can communicate with a plurality of communication devices at the same time, so that the speed, efficiency and bandwidth of ETC communication are improved, and the application of various expansion scenes is satisfied.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a flow chart of a first embodiment of an ETC communication method of the present invention;

FIG. 2 is a schematic diagram of a plurality of time windows within a communication cycle in accordance with one embodiment of the present invention;

FIG. 3 is a schematic diagram of an encapsulation format of control information of a control frame according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of communication states during ETC communication in one embodiment of the invention;

FIG. 5 is a schematic diagram of communication states during ETC communication in one embodiment of the invention;

FIG. 6 is a schematic diagram of communication states during ETC communication in one embodiment of the invention;

FIG. 7 is a flow chart of a second embodiment of an ETC communication method of the present invention;

FIG. 8 is a schematic diagram of a frame encapsulation format in one embodiment of the invention;

FIG. 9 is a diagram of a MAC control domain encapsulation format in one embodiment of the invention;

fig. 10 is a schematic diagram of a communication state of an ETC communication method embodiment three of the present invention;

fig. 11 is a block diagram of a computer device according to a first embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 is a flowchart of an embodiment of an ETC communication method of the present invention, which is applied to an RSU (Road Side Unit), and includes the following steps:

control frame transmission step S11: transmitting a control frame in a current communication period, wherein the control frame comprises control information of a plurality of time windows of the current communication period, and the plurality of time windows comprise: a dedicated time window allocated for at least one communication device having established a communication link and/or at least one common time window not allocated;

a first transceiving step S12: when the special time window exists in the current communication period, according to the control information, corresponding data frames are sent to corresponding communication equipment or corresponding data frames are received from the corresponding communication equipment in the corresponding special time window;

control frame updating step S13: when the current communication period has a public time window, a frame response message sent by an OBU (On board Unit) which does not establish a communication link is received in the public time window, the communication link is established with the frame response message, a special time window is allocated for the OBU in the next communication period, and a control frame of the next communication period is updated.

Regarding this embodiment, the following points are to be explained:

1. the ETC communication system includes a control frame (Frame Control Message, FCM), a Data frame (Message Data, MD), and a management frame. Wherein the control frame is periodically transmitted by the RSU (master device) and is downlink specific. The control frame contains the resource allocation and the allocable resources of all communication devices in the current communication area (the communication link is established), i.e. the control frame is mainly used for controlling the resource allocation in the process of transmitting the data of the MAC layer. In each communication period, it may consist of a control frame and one or more uplink or downlink data frames following the control frame, and the data frames are completed strictly as indicated by control information in the control frame.

2. The communication period includes multiple time windows, which may include two types of dedicated time windows and a common time window, and the dedicated time windows are further divided into a dedicated downlink window and a dedicated uplink window, and the common time window is a broadcast time window, so that the OBU for new access establishes a communication link. As shown in fig. 2, assuming that OBU1, OBU2, and OBU3 are communication devices that have established a communication link with an RSU, respectively, in the current communication period, a plurality of time windows are: a dedicated downlink time window allocated for OBU1, a dedicated downlink time window allocated for OBU2, a dedicated downlink time window allocated for OBU3, a dedicated uplink time window allocated for OBU1, a dedicated uplink time window allocated for OBU2, a dedicated uplink time window allocated for OBU3, and a broadcast time window. In addition, tr1 is one communication period, for example, may be 10ms; t3 is the shortest interval between adjacent downlink frames or adjacent uplink frames, which may be 256 μs, for example; t1 is the shortest interval between a downlink frame and a subsequent adjacent uplink frame, which may be 256 μs, for example; t2 is the shortest interval between an uplink frame and a subsequent adjacent downlink frame, which may be 256 mus, for example.

3. The control information in the control frame includes: the method comprises the steps of time domain information, service addresses and configuration information corresponding to time windows, wherein the time domain information comprises the number of time domains, and in principle, the larger the number of time domains is, the more the number of windows for providing services is, and the more the number of devices capable of simultaneously carrying out communication is; the service address indicates a device address of the current time window service, and if all '1's are set, the current time window is a broadcast time window; the configuration information mainly comprises a data transmission direction, an offset time and a duration of a current time window, wherein the transmission direction comprises: uplink, downlink and uplink and downlink are shared; the offset time indicates the offset time of the start time of the current time window relative to the end of the control frame; the duration is the duration of the current time window, and the transmission of all information should be controlled strictly according to the duration.

4. For a newly accessed OBU (which has not yet established a communication link with the RSU), it may return a frame response message (VST) with information such as the OBU identification, vehicle information, etc. to the RSU in a common time window. When the RSU receives the frame response message, a communication link can be established with the OBU, and a dedicated time window is allocated to the OBU, and the control frame of the next communication period is updated, so that in the next communication period, the OBU can send a corresponding data frame to the RSU in a corresponding dedicated time window, or receive a corresponding data frame from the RSU.

In the technical scheme of the embodiment, the RSU can autonomously allocate the time window (special time window) of communication of each communication device in the area according to the communication state in the current communication area, and meanwhile, the time window (public time window) of quick access of the communication device can be reserved so as to meet the requirement of timely response of the device. Therefore, the RSU can communicate with a plurality of communication devices at the same time, so that the speed, efficiency and bandwidth of ETC communication are improved, and the application of various expansion scenes is satisfied.

Further, in an alternative embodiment, in the control frame transmitting step S11, the step of transmitting the control frame in the current communication period includes: the control frames are transmitted on a plurality of channels of the current communication period, respectively. In this embodiment, it is first explained that there may be multiple, e.g. three, working channels for both the RSU and the OBU, and that, in each communication period, the RSU sends control frames on its multiple channels, respectively, whereas the OBU receives control frames on only one channel (e.g. the default channel), so that when the current channel is busy, i.e. the control information in the control frame (which may be the control frame of the current communication period or the control frame of the next or subsequent communication periods) indicates that there are no allocable time window resources, the OBU may switch the current channel to another channel and re-perform the control frame receiving step, i.e. receive control frames on the new channel and request link establishment from the RSU on the new channel.

Further, the control frame includes control information of a plurality of time windows of each channel of the current communication period, that is, the control frame received at the current channel includes not only control information of a plurality of time windows of the current channel but also control information of a plurality of time windows of other channels, so the control information of the control frame is used to control resource allocation of time domain and frequency domain in the MAC layer data transmission process. For example, as shown in fig. 3, the control information of the control frame includes: the method comprises the steps of time stamping, frequency domain information and k pieces of channel control information, wherein n pieces of window information control information exist in one piece of channel control information, and the time stamping is used for indicating the current local time; the frequency domain information is used for indicating the number of channels used in the current communication area; each channel control information comprises time domain allocation information of the current channel, and specifically comprises time domain information, service address and configuration information.

Further, in an alternative embodiment, after the step of transmitting the respective data frame to the respective communication device, it comprises:

In this embodiment, during the data transmission, if the OBU does not respond beyond a preset time, for example, after the RSU continuously sends a set number of data frames, the RSU may consider that the OBU is disconnected, at this time, a dedicated time window may no longer be allocated to the OBU in the next communication period, and at the same time, a link disconnection instruction is sent to the OBU to disconnect the communication link with the OBU. Further, based on this, after the OBU establishes the communication link, if the OBU has no application data transmission in the downlink or uplink, but does not want to disconnect the communication link from the RSU, at this time, the OBU may transmit a null data frame in the data link layer to maintain the connection of the communication link.

Further, in an alternative embodiment, the frame response message includes priority information, and the step of allocating a dedicated time window for the OBU in a next communication period includes:

In this embodiment, the RSU may determine the priority of the application data to be transmitted according to the priority information in the frame response message returned by the OBU, and further reasonably allocate the communication resource according to the priority, for example, if the priority is higher, a dedicated time window may be preferentially allocated to the OBU.

Further, in an alternative embodiment, the frame response message includes application type information, and the step of allocating a dedicated time window for the OBU in a next communication period includes:

In this embodiment, the lengths of dedicated time windows of a plurality of data frames following the control frame may be unequal, and when the amount of data transmitted by an upper layer application of a downlink or uplink of an OBU served by the RSU is large, the plurality of dedicated time windows may be combined into the same use and transmitted by using a frame splicing manner.

In a specific embodiment, it is assumed that the number of data frames following the control frame is set to n and the number of channels is set to k, where n may be set according to the actual situation of the communication link, and the maximum value preferably does not exceed 8. Further, if the communication between the RSU and the OBU adopts a communication method of equally dividing the time domain and the frequency domain, the communication state at the time of communication is as shown in fig. 4. In addition, if a communication mode with acknowledgement is used in the data transmission process, uplink and downlink of a data frame exist in pairs in principle, and the number of OBUs capable of synchronously transmitting data in a single channel is n/2. There may be multiple downstream MD, one upstream MD, or one downstream MD, multiple upstream MD.

When n is equal to 8 and k=3, the number of OBUs capable of synchronously transmitting data in a single channel is 4, and the number of OBUs capable of synchronously transmitting communication in k channels is 12, that is, RSUs can simultaneously transmit with 12 OBUs, and the communication state during communication is shown in fig. 5. Of course, when the amount of data transmitted by the downlink or uplink upper layer application is relatively large, a plurality of dedicated time windows may be combined into a manner of using the same OBU and using the framing, for example, assuming that the downlink of the OBU5 needs to transmit a large amount of data and the uplink of the OBU6 needs to transmit a large amount of data, after adjusting the lengths of the respective dedicated time windows allocated for the OBU5 and the OBU6, the communication state at the time of communication is as shown in fig. 6.

Fig. 7 is a flowchart of an ETC communication method embodiment two of the present invention, the ETC communication method of the embodiment being applied to an OBU and comprising the steps of:

control frame receiving step S21: receiving a control frame sent by an RSU in a current communication period in a current channel, and acquiring control information of a plurality of time windows of the current communication period by analyzing the control frame, wherein the time windows comprise: a dedicated time window allocated for at least one communication device having established a communication link and/or at least one common time window not allocated;

judgment step S22: judging whether a time window allocated to the OBU exists in the plurality of special time windows, if so, executing step S23; if not, executing step S24;

in the step, whether a time window allocated to the OBU exists in a plurality of special time windows can be judged by judging whether the service address corresponding to each time window in the control information of the control frame is consistent with the address of the OBU, and if the service address of the time window is consistent with the address of the OBU, the existence of the time window allocated to the OBU is indicated; otherwise, it is indicated that the OBU does not establish a communication link with the RSU, and there is no time window allocated for the OBU.

A first transceiving step S23: according to the control information, transmitting corresponding data frames to the RSU in a corresponding special time window, or receiving corresponding data frames from the RSU;

link establishment step S24: and in a public time window, sending a frame response message to the RSU, so that the RSU establishes a communication link with the OBU after receiving the frame response message, and distributing a special time window for the OBU in a next communication period to update a control frame of the next communication period.

In this embodiment, since the RSU can autonomously allocate a time window (dedicated time window) for communication of each communication device in the area according to a communication state in the current communication area, and at the same time, can also reserve a time window (common time window) for quick access of the communication device, for an OBU located in the RSU communication area, after receiving a control frame transmitted by the RSU in the current communication period, control information of a plurality of time windows in the current communication period can be obtained by parsing the control frame, and if the OBU has established a communication link with the RSU, a data frame can be transmitted to the RSU in the corresponding dedicated time window, or a corresponding data frame can be received from the RSU; if the OBU is a newly accessed OBU, i.e. a communication link has not been established with the RSU, it may return a frame response message to the RSU in a common time window to wait for the RSU to allocate a dedicated time window for it in the next communication cycle.

Further, in an alternative embodiment, the RSU transmits control frames on multiple channels of the current communication period, respectively; moreover, the ETC communication method further includes:

and if the current channel is in a busy state, switching the current channel and re-executing the control frame receiving step.

In this embodiment, since the RSU transmits control frames on its multiple channels, respectively, and the OBU receives control frames on only one channel (e.g., the default channel), when the current channel is busy, i.e., the control information in the control frame (which may be the control frame of the current communication period or the control frame of the next or subsequent communication periods) indicates that there are no allocable time window resources, the OBU may switch the current channel to another channel and re-perform the control frame receiving step, i.e., receive the control frame on the new channel and request link establishment from the RSU on the new channel.

Further, the step of acquiring control information of a plurality of time windows of the current communication period includes: the step of acquiring control information of a plurality of time windows of each channel in the current communication period, and switching the current channel comprises the following steps:

randomly selecting a channel and switching the current channel; or alternatively, the process may be performed,

In this embodiment, the OBU may randomly select an other channel when the current channel is busy, or select an idle channel according to the time window allocation information of the other channel in the control information, and switch the current channel. Moreover, because the number of time windows or transmission time indicated in the control frames of different channels may be inconsistent, when the OBU switches channels, the OBU needs to re-receive the control frame after switching channels, and according to the control information of the new control frame, seek the establishment of the link in the corresponding time window, and if the control frame indicates that the current time window is occupied, the response time window can be dynamically adjusted according to the control information of the control frame; if the current channel cannot establish a new link, the channel can be re-switched until a communication link can be established with the RSU.

Further, in an alternative embodiment, the step of sending a frame response message to the RSU during the common time window includes:

In this embodiment, in order to avoid that a plurality of OBUs send frame response messages to RSUs at the same time and further generate collisions, the OBU may delay a random time after the start of the common time window, and then send frame response messages to RSUs, so as to reduce the probability of collision.

The following describes the communication procedure of the ETC communication system in a specific example:

first, as to the frame format of the ETC communication system, as shown in fig. 8, the data link layer information (second layer information) interaction should be performed in the form of a frame, and one frame includes: frame number, device address, destination address, MAC control field, frame length, LPDU (LLC Protocol Data Unit, logical link control protocol data unit), and frame check, wherein:

with respect to a device address for identifying a transmitting device of a current data frame;

regarding the destination address, it may be a 32-bit media access address, which is divided into a broadcast MAC address and a dedicated MAC address, wherein the broadcast MAC address is a 32-bit all "1" bit: 0xFFFFFFFF; the special MAC address value should be 32 bits of non-full '1' bits;

regarding a frame length, which indicates a length from a frame start to frame check information, is composed of 12 bits;

regarding frame numbers, which indicate current frame numbers, and frame numbers of different types of frames are independent of each other;

regarding the MAC control field, as shown in fig. 9, it may be a 4-byte array, where b15-20 is reserved for future systems and should be set to "0", where version information is used to indicate the version of the current protocol; the encryption information is used to indicate whether the PDU data is encrypted, for example, "00" indicates that the PDU data is not encrypted; the frame type is used to indicate the current type, and there are three main types: three major classes, management frame (00), control frame (01) and data frame (10); the D/U is used to indicate the transmission direction of the current MAC layer data, for example, "0" indicates that the transmitted data is downlink; "1" indicates that the transmitted data is uplink data; a segmentation Flag (FRG) is used to identify whether the received information has been segmented, e.g., if it indicates that segmentation has been performed, the FRG should be set to "1"; if it indicates that no segmentation is performed, FRG should be set to "0"; continuation/last (C/L) is used to identify whether the current message is further followed by a message, e.g., if framing information is further followed, C/L should be set to "1"; if there is no subsequent framing or there is only one frame currently transmitted, then C/L is set to "0"; the communication mode (Communication Mode, CM) is used to set the communication mode, for example, if half duplex mode is employed, CM should be set to "1", if full duplex mode is employed, CM should be set to "0"; an Area Type (AT) is used to indicate the type of a device communication Area, for example, if an Area is indicated as a small Area, the AT should be set to "00"; if a wide range of communication areas is indicated, the AT should be set to "11" and the other configuration to remain; the channel information is used to indicate a currently operated channel, for example, 7 channels may be set, and if the currently operated channel is channel 1, the channel information is set to "0000"; if the currently operating channel is channel 2, the channel information is set to "0010"; if the currently operating channel is channel 3, the channel information is set to "0011"; if the currently operating channel is channel 4, the channel information is set to "0100", and so on.

In addition, the front end of the physical layer frame is provided with a preamble and a frame start mark, wherein the preamble is irrelevant to the link layer and is mainly used for signal detection, synchronization and the like of a receiver and a sender, and can be composed of 8 byte arrays, specifically, 0xAA,0x 55; the start of frame flag is used as a start of frame delimiter to identify the start of a frame, which may be 1 byte, with a fixed value of 0xAB.

In the ETC communication system, in conjunction with fig. 10, initially, the RSU periodically transmits a control frame FCM1, in which three common time windows (link establishment windows) ACTS1, ACTS2, ACTS3 are indicated to follow the control frame, each common time window being available for a plurality of OBUs to transmit a frame response message.

When the OBU-a enters the communication area of the RSU, a control frame FCM1 is received, an ACTS3 is randomly selected as a link establishment window according to a common time window specified in the control frame FCMs1, and a frame response message (VST response) is sent to the RSU at the ACTS3 to request the establishment of a link.

When the RSU receives the frame response message of the OBU-a, the control frame FCMS2 of the next communication cycle is updated to indicate that the first data window after the FCMS2 is the dedicated downlink time window of the OBU-a, the second data window is the common time window ACTS1, the third data communication window is the dedicated uplink time window of the OBU-a, and the FCM2 is sent in the next communication cycle.

The OBU-a acquires allocation information of each time window after receiving the control frame FCMS2 in the second communication period, and receives the data frame sent by the RSU in the first dedicated downlink time window, and returns a response data frame in the third dedicated uplink time window after processing is completed (if the response cannot be timely performed in the current FCMS2 period, the next communication period can be waited for).

Meanwhile, the OBU-B, OBU-C enters the communication area, and may receive the control frame FCM2, and return a frame response message (VST response) after randomly delaying in the second data window according to the window information specified in the control frame FCM2.

After receiving the frame response message of the OBU-B, OBU-C, the RSU can update the control frame FCMS3 of the third communication period, and reallocate the communication window of each OBU of the third communication period, where the first data window after FCMS3 is a dedicated downlink time window of the OBU-a, the second data window is a dedicated downlink time window of the OBU-B, the third data window is a dedicated downlink time window of the OBU-C, the fourth data window is a dedicated uplink time window of the OBU-a, the fifth data window is a dedicated uplink time window of the OBU-B, the sixth data window is a dedicated uplink time window of the OBU-C, and the seventh data window is a common time window ACTS1, assuming that the random delay of the OBU-B, OBU-C when returning to the VST does not generate collision.

Thereafter, in a third communication cycle, OBU-A, OBU-B, OBU-C communicates in accordance with the window indicated by control frame FCMS 3.

The present invention also constructs a storage medium storing a computer program comprising program instructions that when executed by a processor can implement the steps of the ETC communication method described in the above embodiments.

The storage medium may be a U-disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, or other various computer-readable storage media that can store program codes.

The invention also constructs a computer device comprising a memory and a processor coupled to the memory; the memory is used for storing a computer program; the processor is configured to run a computer program stored in the memory to perform the steps of the ETC communication method described above.

Fig. 11 is a block diagram of a first embodiment of a computer device according to the present invention, where the computer device 100 may be an RSU or an OBU, and referring to fig. 11, the computer device 100 includes a processor 102, a memory, and a network interface 105 connected through a system bus 101, where the memory may include a nonvolatile storage medium 103 and an internal memory 104.

The non-volatile storage medium 103 may store an operating system 1031 and a computer program 1032. The computer program 1032 includes program instructions that, when executed, cause the processor 102 to perform the internal network management method described above.

The processor 102 is used to provide computing and control capabilities to support the operation of the overall computer device 100.

The internal memory 104 provides an environment for the execution of a computer program 1032 in the non-volatile storage medium 103, which computer program 1032, when executed by the processor 102, causes the processor 102 to perform the ETC communication method described above.

The network interface 105 is used for network communication with other devices. Those skilled in the art will appreciate that the architecture shown in fig. 11 is merely a block diagram of a portion of the architecture in connection with the present application and is not intended to limit the computer device 100 to which the present application is applied, and that a particular computer device 100 may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.

Wherein the processor 102 is configured to execute the computer program 1032 stored in the memory to implement the steps of:

Alternatively, the following steps are implemented:

a control frame receiving step: receiving a control frame sent by an RSU in a current communication period in a current channel, and acquiring control information of a plurality of time windows of the current communication period by analyzing the control frame, wherein the time windows comprise: a dedicated time window allocated for at least one communication device having established a communication link and/or at least one common time window not allocated;

and a second transceiving step: if so, sending a corresponding data frame to the RSU or receiving a corresponding data frame from the RSU in a corresponding special time window according to the control information;

a link establishment step: if the communication link does not exist, a frame response message is sent to the RSU in a public time window, so that the RSU establishes a communication link with the OBU after receiving the frame response message, and a special time window is allocated to the OBU in a next communication period, and a control frame of the next communication period is updated.

It should be appreciated that in embodiments of the present application, the processor 102 may be a central processing unit (Central Processing Unit, CPU), the processor 102 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSPs), application specific integrated circuits (Application Specific Integrated Circuit, ASICs), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. Wherein the general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An ETC communication method applied to an RSU, comprising:

2. The ETC communication method according to claim 1, wherein the step of transmitting the control frame in the current communication period includes:

3. The ETC communication method according to claim 1, characterized by comprising, after the step of transmitting the respective data frame to the respective communication device:

4. The ETC communication method according to claim 1, wherein the frame response message includes priority information;

5. The ETC communication method according to claim 1, wherein the frame response message includes application type information;

6. An ETC communication method applied to an OBU, comprising:

7. The ETC communication method according to claim 6, wherein the RSU transmits control frames on a plurality of channels of a current communication period, respectively;

moreover, the ETC communication method further includes:

8. The ETC communication method according to claim 7, wherein the step of acquiring control information of a plurality of time windows of the current communication period includes:

moreover, the step of switching the current channel includes:

9. The ETC communication method of claim 6, wherein the step of transmitting a frame response message to the RSU during the common time window comprises:

10. A computer device comprising a memory and a processor coupled to the memory; the memory is used for storing a computer program; the processor is configured to execute a computer program stored in the memory to perform the steps of the ETC communication method according to any one of claims 1-9.

11. A storage medium storing a computer program which, when executed by a processor, implements the steps of the ETC communication method according to any one of claims 1-9.