CN115941215A - Method and device for sending and receiving data, communication system, and vehicle-machine system - Google Patents

Abstract

The invention relates to a method and equipment for sending data and receiving data, a communication system and a vehicle-mounted machine system. The method for transmitting data comprises the following steps: adding, by a transmitting device, at least a first time tag in data to be transmitted; the first time tag indicates a latest time at which the data was read; and transmitting, by the transmitting device, the data to which the first time stamp has been added. The method, the device and the system provided by the embodiment of the invention can be used for simply and efficiently realizing the encryption of communication data and the automatic destruction of expired data according to the preset time and data modification mode, and leading the receiving device to save storage resources.

Description

Method and device for sending and receiving data, communication system, and vehicle-machine system

technical field

The invention relates to data communication technology, in particular to a method and device for sending and receiving data, a communication system and a vehicle-machine system.

Background technique

Currently in the field of data communication, there are a large amount of real-time transmission or exchange of various data information in the data communication network. This kind of data information is real-time and/or private, and has a huge amount of information. Completely saving these data information may cause the data processing terminal or server to consume a large amount of storage resources and computing resources. A lot of data with strong immediacy has no reuse value, and continuing to retain the data leads to unnecessary occupation of storage resources of the receiving device. For example, in the Internet of Vehicles, the communication system of each intelligent networked vehicle, especially the vehicle-machine system of an unmanned vehicle, must communicate with all participants in the transportation system (such as other vehicles on the road and basic communication facilities, as well as remote In the exchange of information between servers, etc.), each communication participant receives a large amount of real-time data information from other participants, such as the geographic location at each time point during the driving process of the vehicle, the target orientation at the next time point, and the real-time instruction information, etc. A large amount of data information makes the confidentiality and storage of information a big challenge, and how to timely destroy massive data information with certain privacy and low preservation value has become a problem that needs to be solved at present.

Contents of the invention

According to an aspect of the present invention, there is provided a method for sending data in a communication system, the method comprising: adding at least a first time stamp to the data to be sent by the sending device; wherein the first A time stamp indicates the latest time at which the data was read; and the data to which the first time stamp is added is transmitted by the sending device.

According to another aspect of the present invention, there is provided a method for receiving data in a communication system, the method comprising: receiving, by the receiving device, data in which at least a first time stamp has been added; wherein the first a time stamp indicating the latest time at which the data was read; extracting the first time stamp from the data; and after the latest time at which the data was read indicated by the first time stamp, The data received is modified.

According to yet another aspect of the present invention, there is provided a sending device for sending data, including: an encoding unit configured to add at least a first time stamp to the data to be sent; wherein the first time stamp indicates the latest time when the data was read; and a sending unit configured to send the data to which the first time stamp has been added.

According to still another aspect of the present invention, there is provided a receiving device for receiving data, including: a receiving unit configured to receive data to which at least a first time stamp has been added; wherein the first time stamp indicates the The latest time at which the data was read; a decoding unit configured to extract the first time stamp from the data; and a re-encoding unit configured to extract the first time stamp at the time indicated by the first time stamp Modify the received data after the latest time the data was read.

According to still another aspect of the present invention, a communication system is provided, including the sending device and the receiving device described in the embodiments of the present invention. A communication system, comprising: a plurality of sending devices provided in the embodiments of the present invention and a plurality of receiving devices provided in the embodiments of the present invention; wherein, the sending devices are configured to send the receiving devices sending data; the receiving device is configured to receive data from the sending device.

According to yet another aspect of the present invention, a vehicle-machine system is provided, including a wireless communication system for communication of the Internet of Vehicles, the wireless communication system including: a sending device as provided in an embodiment of the present invention and a wireless communication system according to the present invention The receiving device provided in the embodiment of the present invention; wherein, the sending device is configured to send data to other receiving devices; and the receiving device is configured to receive data from other sending devices.

According to yet another aspect of the present invention, there is provided a method for encoding data to be transmitted in a communication subsystem, the communication subsystem at least including a data sending device and a data receiving device, the method comprising: adding at least one time stamp; adding field information used to identify the uniqueness of the communication subsystem to the time stamp; and encoding the data added with the time stamp and the field information into the data to be sent data.

According to yet another aspect of the present invention, there is provided a time service system, which is included in a first communication device or a remote server that communicates with a second communication device, and is configured to send a message to the second communication device Providing a synchronized time signal, the time service system includes: an encoding unit configured to generate a time tag and field information for identifying the uniqueness of the first communication device and/or the second communication device data; and a sending unit configured to send the data to the first communication device.

The method, device and system provided by the embodiments of the present invention can be used to simply and efficiently realize the encryption of communication data and the automatic destruction of expired data according to the predetermined time and data modification mode.

Description of drawings

Fig. 1 shows a flowchart of a method for transmitting data in a communication system according to an embodiment of the present invention.

Fig. 2 shows a flowchart of a method for receiving data in a communication system according to an embodiment of the present invention.

Fig. 3 shows a schematic diagram of a data structure according to an embodiment of the present invention.

Fig. 4 shows a structural block diagram of a sending device for sending data according to an embodiment of the present invention.

FIG. 5 shows a structural block diagram of a receiving device for receiving data according to an embodiment of the present invention.

Fig. 6 shows a structural block diagram of a communication system according to an embodiment of the present invention.

Detailed ways

Fig. 1 shows a flowchart of a method for transmitting data in a communication system according to an embodiment of the present invention. The method 100 shown in 1 includes: adding at least a first time stamp (step 110) in the data to be sent by a sending device; wherein, the first time stamp indicates the latest time when the data is read; and sending by the sending device The first time-tagged data has been added (step 120). This data may include various data such as digital information and control instructions. The latest time when the data is read may be the latest time when the data is received by the designated receiving device, the latest time when the data is used after being received, the latest time when the instruction data is executed after being received, the latest time when the data is used after being received, Any of the latest time to be decoded after reception, etc.

According to the method 100 of this embodiment, the data with the first time stamp can only be received and read by a specific receiving device, and the specific receiving device has been preset to extract the first time stamp and The receiving device that reads the data. The sending device sends the data with the first time stamp added to the receiving device, so that after the corresponding receiving device receives the sent data, by extracting the first time stamp, the latest time can be read in the indicated data Afterwards, the data is modified or destroyed, so that the encryption of communication data and the automatic destruction of expired data can be realized simply and efficiently according to the scheduled time and data modification method. Adding the first time tag makes the data time-sensitive. Once the set data reading time has passed, the information string of the data will be automatically rewritten as no information or irreversible information through the pre-set data modification rules. string.

The embodiments of the present invention are especially suitable for transmitting data with strong immediacy, which has little value in preservation and reuse, and timely destruction of data is beneficial to saving storage space of the receiving device.

In some embodiments, the method 100 further includes: adding a second time stamp to the data to be sent by the sending device; wherein, the second time stamp indicates the time when the data is sent; and sending the added first time stamp by the sending device and second time-tagged data. After receiving the data, the receiving device can use the data sending time indicated in the second time tag to generate a random data modification rule, so that the modified data is difficult to recover and realize data encryption and destruction. For example, a part or several parts of the binary information string can be randomly modified to be all 0s or all 1s. Even after the modified data is copied from the original storage device, it cannot be restored, because the new data reading device does not know the data modification rules, nor does it know the meaning of the data structure and time stamp.

In some embodiments, the first time stamp is added at the end of the data, and the second time stamp is added at the beginning of the data. The time amounts in the first time tag and the second time tag can be expressed in decimal or binary. Fig. 3 shows an example structure of a kind of data according to an embodiment of the present invention, wherein the data 300 to be sent includes a data body part 302, a first time stamp 303 at its tail and a second time stamp 301 at its head . But embodiments of the present invention are not limited thereto, the first time stamp can also be added at the head of the data, and the second time stamp can also be added at the end of the data; or, the first time stamp and the second time stamp can be inserted to anywhere else in the data. The receiving device acquires setting information about adding and reading time stamps in advance, so as to correctly extract the first and second time stamps from the data, and read the indicated time information.

The embodiment of the present invention is not limited to only adding the first and second time stamps in the data, and when business needs, the third time stamp and the fourth time stamp for specific purposes can also be added at a specific position in the data or more time tags. For example, the third time stamp is used to indicate the time when the receiving device clears or changes all the data to "0", and the fourth time stamp is used to indicate the latest time when the instruction information in the data is executed.

In the above embodiments, the first time stamp indicates the latest data read time, and the second time stamp indicates the data transmission time. These two time quantities can be standard time conforming to the universal time system, including AD year, month, day, hour, minute, second, millisecond and other units, and can also include smaller units of microseconds, and are used in the entire communication system Synchronized time. For example, the arrangement format of the first time label is: YYYY (year, 4 digits) MM (month, 2 digits) DD (day, 2 digits) HH (hour, 2 digits) MM (seconds, 2 digits) yyy (milliseconds, 3 digits), the first time label is referred to as "ET". The arrangement format of the second time stamp can also be: YYYYMMDDHHMMyyy, and can also include a smaller microsecond unit, and the second time stamp is referred to as "ST". On the other hand, since the second time stamp indicates the data transmission time, in some cases, the first time stamp may also be set to include predetermined time length information (for example, 2 hours and 10 minutes) to indicate the latest data read time is a predetermined length of time after the data transmission time.

In the above embodiments, the "latest data read time" is actually the cut-off time set for data reading. Once this time is reached, no matter whether the data is read, executed or utilized, the data will be modified or clear. The setting of "latest data reading time" can be based on factors such as data usage and confidentiality requirements, and it can be set between a few seconds to more than ten seconds, not exceeding 1 minute. If the received data does not include the first time stamp, the receiving device may assume that the data will be saved without any modification.

In some embodiments, the first time stamp may also include a unique field for identifying the communication system (also referred to as a system label field). The system tag field is used by all data sending devices and receiving devices in the entire communication system. It can be used for the receiving device in the communication system to identify that the received data belongs to the data transmitted in the communication system, and it can also be used for data identification. encryption. Even if other communication devices outside the system receive the data, because they do not know the meaning and structure of the field, it is difficult to determine the content of the data and read the data correctly. In some examples, the system label field may contain foreign abbreviations representing information such as the hardware manufacturer of the communication device (such as the sending device and/or the receiving device), the software manufacturer, the location where the communication device (such as the sending device and/or the receiving device) is used, etc. Or the abbreviation of Chinese Pinyin, and the date of manufacture of the equipment. For example, the system label field corresponding to Huawei's equipment is "HW", the system label field corresponding to Volkswagen's equipment is "VW", and the system label field corresponding to data communication in the Beijing area is "BJ", etc. For example, "HWBJ20210205" can be used to represent the system label used in Beijing by Huawei's communication equipment shipped on February 5, 2021. The system tag field may contain any one or different combinations of the above information. Due to the randomness of information such as the manufacturer and date of manufacture contained in the system label field, it can play a role in data encryption. The system label field used in the embodiment of the present invention is not limited to the above examples, and other field information for uniquely identifying the communication system may be used. On the other hand, through the control of the remote server, the information in the system tag field in the first time tag is variable. For example, when the sending device is in a different location, the cloud server sends a new time to each communication device in the communication system. Synchronization indication, which contains the system label field indicating the update location, so that each communication device can change the information of the system label field synchronously throughout the system. For example, when the location of the sending device is changed from Beijing to Shanghai, this field can be included "BJ" becomes to contain "SH"; alternatively, the information in the system tag field can be periodically changed by the remote server to facilitate data encryption.

Fig. 2 shows a flowchart of a method for receiving data in a communication system according to an embodiment of the present invention. The method 200 shown in Fig. 2 includes: receiving by a receiving device at least data with a first time stamp added thereto (step 210); wherein, the first time stamp indicates the latest time when the data is read; extracting the first time stamp from the data time stamping (step 220); and modifying the received data after the latest time at which the data indicated by the first time stamp was read (step 230). According to this embodiment, after the receiving device receives the sent data, by extracting the first time stamp, the data can be modified or destroyed after the latest reading time of the data indicated therein, so that the data can be read according to the predetermined time And data modification methods, simple and efficient implementation of encryption of communication data and automatic destruction of expired data, so that the receiving device saves storage space.

In some embodiments, a second time stamp may be added to the data, and the second time stamp indicates the time when the data is sent; the method 200 further includes: using the first time stamp and/or the second time stamp to generate a time stamp for modifying the data and after the latest time at which the data indicated by the first time stamp is read, modifying the data based on the modification rule. Due to the randomness of the data transmission time indicated in the second time stamp, especially the number of seconds and milliseconds in the data transmission time, there is great uncertainty, so that the receiving device can use the second time stamp after receiving the data. Generate random data modification rules at the data sending time indicated in , so that the modified data is difficult to recover and realize data encryption and destruction.

In some embodiments, the data is a binary information string; modifying the data includes modifying or deleting specific bits or specific bit strings in the binary information string. As shown in FIG. 3, the data body part 302 includes a binary information string "1011...010". In the embodiment of the present invention, the data is not limited to be a binary information string.

In some embodiments, the data modification rule includes setting specific bits in the binary information string to be modified or deleted in the data based on the number of milliseconds in the second timestamp; the data modification includes: setting the specific bit in the binary information string to and/or replace the "1" of a specific bit in the binary information string with a "0".

The modification range of 0 or 1 for a specific bit can be randomly specified. In one example, when the last digit of the millisecond number in the second time stamp is an even number (including the case of zero), all "1" in the binary information string are replaced with "0"; When the last number of milliseconds is an odd number, all "0"s in the binary string are replaced with "1".

In another example, the data transmission time indicated in the second time tag is "20191017 103755123", which means 10:37:55 seconds and 123 milliseconds on October 17, 2019. The corresponding data modification rules are generated as follows: take the number of milliseconds 123 in the data sending time, calculate 1+2+3=6, modify the first 1 to the sixth 1 in the binary information string of the data to 0, The seventh 1 to the twelfth 1 are not modified, the thirteenth 1 to the eighteenth 1 are modified to 0, and so on until the last bit of the entire binary information string of the data, and the entire data is completed. Revise. Since "123" in the data transmission time describes the number of milliseconds, and each number is summed in the calculation, the sum result "6" (which indicates the position in the information string) has great randomness and inconsistency. Determinism, so the above data modification rules generated according to the number of milliseconds in the data sending time also have great randomness and uncertainty; the possibility of data modified according to the above data modification rules is very small, and the data modification It is difficult to be traced. Those skilled in the art can understand that the embodiment of the present invention is not limited to the data modification rules generated in this example, and other data modification rules can be generated according to the second time stamp.

In a data modification example, assume that the second time tag 301 shown in Figure 3 is "20191017 105355001", indicating that this data will be sent at 10:53:55:001 milliseconds on October 17, 2019; the first time Label 303 is "20191017 1053 58999", indicating that this data will be invalidated (unreadable) at 10:53:58:999 milliseconds on October 17, 2019; data body part 302 is "011 010 101 011 111 000 010 101 0101". Assuming that the data was received at 10:53:56:123 milliseconds on October 17, 2019, the data can be modified according to the following rules after the data expiration time indicated by the first time tag 303: (1) Since the data is received The number of milliseconds of the time is 123 milliseconds, get 1+2+3=6; (2) check the binary data string of data body part 302, all " 1 " every 6 groups, first group " 1 " all Replaced with "0", the "1" of the second group is not replaced, and the "1" of the third group is replaced with "0". Thus, the data body part 302 is modified to "000 000 000 001 111 000 010 100 0000".

In some embodiments, the method 200 further includes: before sending data, the receiving device performs time synchronization, so as to maintain consistency and synchronization of time measurement in the communication system. Therefore, the receiving device can modify or destroy the data precisely according to the latest reading time of the data in the first time stamp. Both the receiving device and the sending device may include a time synchronization unit for realizing time synchronization. In addition, when the system time is synchronized between the sending device and the receiving device, the reading rules of time tags are stipulated, including the position and tag length of each time tag in the data. The time synchronization process can be carried out by transmitting synchronization time information to the receiving device and the sending device through an independent time service system, or by sending the synchronization time information from the sending device to the receiving device. During the time synchronization process, the 0 o'clock time or the start time of the subsystem composed of the receiving device and the sending device can be set, and it is not required to reset the system time to zero every time the time synchronization is performed.

Fig. 4 shows a structural block diagram of a sending device for sending data according to an embodiment of the present invention. The sending device 400 shown in FIG. 4 includes: an encoding unit 420 configured to add at least a first time stamp to the data to be sent; wherein the first time stamp indicates the latest time when the data is read; and a sending unit 430. Be configured to send the data to which the first time tag has been added. The sending device 400 can be used to implement the method 100 shown in Figure 1 in the above embodiment, by sending the data with at least the first time stamp added, so that the data receiving device can implement the method simply and efficiently according to the predetermined time and data modification method Encryption and destruction of communication data.

In some embodiments, the encoding unit 420 is also configured to add a second time stamp to the data to be sent; wherein the second time stamp indicates the time when the data is sent; the sending unit 430 is also configured to send the added second time stamp The data of the first time label and the second time label.

In some embodiments, the encoding unit 420 adds the first time stamp at the end of the data, and adds the second time stamp at the beginning of the data. But the embodiments of the present invention are not limited thereto.

In some embodiments, the sending device 400 further includes: a sending end time synchronization unit 410 configured to perform time synchronization before sending data. The time synchronization unit 410 at the sending end can realize its own system time synchronization by receiving synchronization time information from an independent time service system or other communication devices, and can also realize synchronization with the receiving device by sending synchronization time information to the receiving device for data communication with it. time synchronization.

FIG. 5 shows a structural block diagram of a receiving device for receiving data according to an embodiment of the present invention. The receiving device 500 includes: a receiving unit 510 configured to receive data in which at least a first time stamp has been added; wherein the first time stamp indicates the latest time when the data is read; a decoding unit 530 configured to read from the data extracting the first time stamp; and the re-encoding unit 540 configured to modify the received data after the latest time when the data indicated by the first time stamp is read. The receiving device 500 can be used to implement the method 200 shown in FIG. 2 in the above embodiment. By receiving the data with at least the first time tag added, the receiving device 500 can realize communication simply and efficiently according to the predetermined time and data modification method. Encryption and destruction of data, easy to implement and inexpensive.

In some embodiments, the received data further includes a second time stamp, and the second time stamp indicates the time when the data was sent; the re-encoding unit 540 is further configured to: utilize the first time stamp and/or the second time stamp generating a modification rule for modifying the data; and modifying the data based on the modification rule after the latest time at which the data indicated by the first time stamp was read.

In some embodiments, the received data is a binary information string; the re-encoding unit 540 is further configured to modify or delete specific bits or specific bit strings in the binary information string based on modification rules. In some embodiments, the data modification rule includes setting specific bits in the binary information string to be modified or deleted in the data based on the number of milliseconds in the second time stamp; the modification of the data includes: "0" of a specific bit is replaced with "1"; and/or "1" of a specific bit in the binary information string is replaced with "0".

In some embodiments, the receiving device 600 further includes: a receiving end time synchronization unit 520 configured to perform time synchronization before receiving data. The time synchronization unit 520 at the receiving end can realize its own system time synchronization by receiving synchronization time information from an independent time service system or other communication equipment, and can also realize synchronization with the transmission equipment by receiving synchronization time information from the transmission equipment with which data communication is performed. time synchronization.

Fig. 6 shows a structural block diagram of a communication system according to an embodiment of the present invention. As shown in FIG. 6 , a communication system 600 includes: a sending device 610 and a receiving device 620 . Communication system 600 may include multiple sending devices 610 and multiple receiving devices 620 . For simplicity, only one sending device 610 and one receiving device 620 are shown in FIG. 6 . The sending device 610 may be the sending device 400 shown in FIG. 4 in the above embodiment; the receiving device 620 may be the receiving device 500 shown in FIG. 5 in the above embodiment. The sending device 610 and the receiving device 620 may be independent devices, or included in different information processing systems, so as to send and receive data between each other. A single sending device 610 and a single receiving device 620 constitute a subsystem when sending and receiving data. The two must perform time synchronization and agree on how to modify or destroy data. randomness to improve data encryption performance.

In the process of time synchronization between the sending device 610 and the receiving device 620, the system tag field can also be transmitted to each sending device and receiving device in the entire communication system 600, so as to identify and read the first time tag in the received data , and read the data correctly. The system time synchronized by the sending device 610 and the receiving device 620 is associated with the system tag field (as a field describing the uniqueness of the system). During wireless transmission of data, the data may be received by any third-party receiving device other than the intended receiving device. However, since the system time of any third-party receiving device has not been time-synchronized with the sending device 610, any third-party receiving device does not have information in the system tag field, so any third-party receiving device cannot read the data.

The communication system 600 may also include a remote server (such as a cloud server), which is used to provide necessary data or control instructions to the sending device 610 and the receiving device 620, for example, to transmit a unified system tag field to all sending devices and receiving devices in the system. Change the time stamp of data uniformly in the whole system, or control the time synchronization of all sending devices and receiving devices, etc.

In the embodiment shown in FIG. 6, the sending device 610 includes: an information standardization unit 611, which is used to make the data to be sent have a unified standard format, such as a binary information string with a predetermined length; a sending end time synchronization unit 612, Used for time synchronization with other data receiving devices and sending devices in the entire communication system; an encoding unit 613; and a sending unit 614. The sender time synchronization unit 612, the encoding unit 613, and the sending unit 614 may be the same as the sender time synchronization unit 410, the encoding unit 420, and the sending unit 430 shown in FIG. 4 in the foregoing embodiment. As shown in Figure 6, the receiving device 620 includes: a receiving unit 621, used to receive data from the sending device 610; a receiving end time synchronization unit 622, used to perform time synchronization with the sending device 610; Extract the first time stamp and the second time stamp, and the data is also in a readable state; the re-encoding unit 624 is used to modify the received data after the latest reading time of the data indicated by the first time stamp; and The storage unit 625 is used for storing the modified data.

In one example, during the initialization process of the information processing device, time synchronization is performed with another information processing device through wireless communication, that is, the time synchronization unit 612 at the sending end and the time synchronization unit 622 at the receiving end perform time synchronization operations, so as to realize Time synchronization between the sending device 610 and the receiving device 620 . When the sending device 610 needs to send data after starting, the encoding unit 613 generates a binary information string as the data to be sent, and notifies the sending unit 614 that there is a need for data transmission, and the sending unit 614 confirms that it can be sent and returns the expected sending time point to the encoding unit 613 After the encoding unit 613 adds time labels ST and ET to the binary information string, the encoded data containing ST and ET is sent to the sending unit 614 . The sending unit 614 transmits the data to the receiving device 620 via a digital information transmission channel (wired or wireless). The receiving device 620 checks the current time a few seconds after receiving the data, and compares the current time with the preset "data latest reading time" in ET and the time tag ET. If the current time point is within the preset After the "latest read time of data", the re-encoding unit 624 completely replaces the 1 in the binary information string of the data with 0, or vice versa, to modify the received data; the re-encoding unit 624 can also directly The data is all zeroed to destroy the data.

The vehicle-machine system provided according to the embodiments of the present invention may include a wireless communication system for communication in the Internet of Vehicles. The wireless communication system includes: a sending device as described in the above embodiments and a receiving device as described in the above embodiments. The sending device may be the sending device 400 or 610 described in FIG. 4 and FIG. 6 , and the receiving device may be the receiving device 500 or 620 described in FIG. 5 and FIG. 6 . The sending device can send data containing time stamps to other receiving devices; the receiving device receives data containing time stamps from other sending devices, and modifies the data according to the predetermined data modification rules after the predetermined latest data reading time, which is simple and efficient Realize the encryption and destruction of IoV communication data efficiently, clear a large amount of instant messaging data in IOV communication, and avoid data leakage and unnecessary occupation of data storage resources of the IOV system.

According to an embodiment of the present invention, there is also provided a method for encoding data to be transmitted in a communication subsystem. The communication subsystem includes at least a data sending device and a data receiving device. The data encoding method includes: in the data Adding at least one time stamp; adding field information used to identify the uniqueness of the communication subsystem in the time stamp; and encoding the data added with the time stamp and field information into data to be sent. The time stamp may contain a system time for time synchronization between the data sending device and the data receiving device of the communication subsystem.

In some embodiments, the field information added in the time tag includes the name of the manufacturer of the data sending device and/or the data receiving device, the date of manufacture of the device, the geographic location of the data sending device and/or the data receiving device at least one item of relevant information.

According to an embodiment of the present invention, there is also provided a time service system, which is included in a first communication device or a remote server that communicates with a second communication device, and is configured to provide a synchronized time to the second communication device information, the timing system includes: an encoding unit configured to encode the synchronization time information and field information used to identify the uniqueness of the first communication device and/or the second communication device into timing data; and a sending unit configured Used to send timing data to the second communication device. The synchronization time information includes system time for time synchronization between the first communication device and the second communication device.

Synchronous time information in a timing system is timing information independent of communication devices. In one example, a remote server (such as a cloud server) sends a system time synchronization instruction including synchronization time information to each communication device or vehicle-machine system in the system, so as to realize time synchronization of each communication device. In another example, one or some communication devices are allowed to send a system time synchronization indication to other communication devices in the entire communication system, so as to realize time synchronization among these communication devices. During wireless communication, time synchronization is often a prerequisite for data readability. By using the time service system of the embodiment of the present invention, time service and time synchronization can be performed on each communication device in the communication system, and data encryption can be realized by synchronizing time information and field information identifying device uniqueness.

The above descriptions are only preferred embodiments of the present invention, and do not constitute any limitation to the present invention. After understanding the content and principle of the present invention, those skilled in the art can make various modifications and variations in form and details without departing from the principle of the present invention, and these modifications and variations based on the principle of the present invention should still be Within the scope of protection defined by the claims of this patent.

Claims (23)

1. A method for transmitting data in a communication system, the method comprising:

adding, by a transmitting device, at least a first time tag in data to be transmitted; wherein the first time tag indicates a latest time at which the data was read; and

transmitting, by the transmitting device, the data to which the first time tag has been added.

2. The method of claim 1, further comprising:

adding, by the sending device, a second time tag in the data to be sent; wherein the second time tag indicates a time at which the data was transmitted; and

transmitting, by the transmitting device, the data to which the first time stamp and the second time stamp have been added.

3. The method of claim 2, wherein the first time tag is added at the end of the data and the second time tag is added at the head of the data.

4. A method according to any of claims 1 to 3, wherein the first time tag further comprises a field for identifying the uniqueness of the communication system.

5. A method for receiving data in a communication system, the method comprising:

receiving, by a receiving device, data in which at least a first time tag has been added; wherein the first time tag indicates a latest time at which the data was read;

extracting the first time tag from the data; and

modifying the received data after a latest time at which the data indicated by the first time tag was read.

6. The method of claim 5, wherein a second time stamp is further appended to the data, the second time stamp indicating a time at which the data was transmitted; the method further comprises the following steps:

generating a modification rule for modifying the data using the first time stamp and/or the second time stamp; and

modifying the data based on the modification rule after a latest time at which the data indicated by the first time tag was read.

7. The method of claim 6, wherein the data is a binary string; the modification of the data includes modifying or deleting a particular bit or string of bits in the binary information string.

8. The method of claim 7, wherein the modification rule includes setting a particular bit in the binary string to be modified or deleted in the data based on a number of milliseconds in the second time tag;

the modification comprises:

replacing "0" of a specific bit in the binary information string with "1"; and/or

Replacing a "1" of a particular bit in the binary information string with a "0".

9. The method of claim 5, further comprising:

the receiving device performs time synchronization with the transmitting device before transmitting the data.

10. A transmitting device for transmitting data, comprising:

an encoding unit configured to add at least a first time stamp in data to be transmitted; wherein the first time tag indicates a latest time at which the data was read; and

a transmitting unit configured to transmit the data to which the first time tag has been added.

11. The transmission apparatus according to claim 10, wherein the encoding unit is further configured to add a second time tag in the data to be transmitted; wherein the second time tag indicates a time at which the data was transmitted; and the transmitting unit is further configured to transmit the data to which the first time stamp and the second time stamp have been added.

12. The transmission apparatus according to claim 11, wherein the encoding unit adds the first time stamp to a tail of the data and adds the second time stamp to a head of the data.

13. The transmission apparatus according to claim 10, further comprising:

a transmitting end time synchronization unit configured to perform time synchronization before transmitting the data.

14. A receiving device for receiving data, comprising:

a receiving unit configured to receive data to which at least a first time stamp has been added; wherein the first time tag indicates a latest time at which the data was read;

a decoding unit configured to extract the first time tag from the data; and

a re-encoding unit configured to modify the received data after a latest time at which the data indicated by the first time tag is read.

15. The receiving device of claim 14, wherein the data further comprises a second time tag indicating a time at which the data was transmitted; the re-encoding unit is further configured to: generating a modification rule for modifying the data using the first time tag and/or the second time tag; and modifying the data based on the modification rule after a latest time indicated by the first time tag at which the data was read.

16. The reception apparatus according to claim 15, wherein the data is a binary information string; the re-encoding unit is configured to modify or delete a specific bit or a specific bit string in the binary information string based on the modification rule.

17. The receiving device of claim 16, wherein the modification rule includes setting a particular bit in the binary string to be modified or deleted in the data based on a number of milliseconds in the second time tag;

the modification comprises:

replacing "0" of a specific bit in the binary information string with "1"; and/or

Replacing a "1" of a particular bit in the binary information string with a "0".

18. The reception apparatus according to claim 14, further comprising:

a receiving end time synchronization unit configured to perform time synchronization before receiving the data.

19. A communication system, comprising: a plurality of transmitting devices according to any one of claims 9 to 12 and a plurality of receiving devices according to any one of claims 13 to 17; wherein the sending device is configured to send data to the receiving device; the receiving device is configured to receive data from the sending device.

20. A car machine system comprising a wireless communication system for car networking communication, the wireless communication system comprising:

a transmitting device according to any one of claims 9 to 12 and a receiving device according to any one of claims 13 to 17; wherein the sending device is configured to send data to other receiving devices; the receiving device is configured to receive data from other transmitting devices.

21. A method for encoding data to be transmitted in a communication subsystem comprising at least a data transmitting device and a data receiving device, the method comprising:

adding at least one time tag to the data;

adding field information for identifying uniqueness of the communication subsystem in the time tag; and

encoding the data to which the time stamp and the field information are added into data to be transmitted.

22. The method of claim 21, wherein the field information includes information related to at least one of a name of a device manufacturer of the data transmission device and/or the data reception device, a device production date, and a geographical location where the data transmission device and/or the data reception device is located.

23. A time service system included in a first communication device or a remote server communicating with a second communication device and configured to provide synchronized time information to the second communication device, the time service system comprising:

an encoding unit, configured to encode the synchronization time information and field information for identifying uniqueness of the first communication device and/or the second communication device as time service data; and

a sending unit, configured to send the time service data to the second communication device.

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