JP4669807B2 - Communications system - Google Patents

Description

  The present invention relates to a communication system, and more particularly to an error detection technique using repeat processing.

  Some communication systems perform error detection processing called repeat processing. In a specific example, this repeat processing is performed on data indicated by data (for example, Patent Document 1) broadcast by a base station device of a mobile communication system. In the following, this repeat process will be described first.

  In a communication system, data transmission is generally performed for each predetermined amount of data, and each data transmission unit (packet, time slot, etc.) generally includes communication control data. In the repeat process, the communication control data is included (repeated) a plurality of times in each data transmission unit in the transmission side communication device.

The receiving-side communication device extracts a plurality of communication control data from the received data transmission unit and compares them with each other. If there is a different part, that part is detected as an error part. In this way, error detection by repeat processing is performed.
Special table 2004-511143 gazette

  However, when the repeat process is performed, there is a problem that the amount of data that can be included in the data transmission unit is reduced. For this reason, it is desired to increase the amount of data that can be included in a data transmission unit while performing error detection of communication control data by repeat processing.

  Accordingly, an object of the present invention is to provide a communication system that can increase the amount of data that can be included in a data transmission unit while performing error detection of communication control data by repeat processing. .

  Another object of the present invention is to perform error detection by repeat processing without transmitting repeat data when transmitting data having a predetermined relationship for each data transmission unit such as communication control data. It is an object of the present invention to provide a communication system that makes it possible.

  A communication system according to the present invention for solving the above-described problem is a communication system in which a first communication device and a second communication device are connected for communication, and the first communication device is a first communication device. First communication data acquiring means for acquiring first communication data including communication control data, a first communication data main body portion constituted by the first communication data, and the first communication among the first communication data. First transmission data generating means for generating first transmission data including a first communication data overlapping portion configured to include control data, and transmission means for transmitting the first transmission data, The second communication device includes: a receiving unit that receives the first transmission data transmitted from the first communication device; and the first communication data main body portion and the first transmission data received from the first transmission data received by the receiving unit. 1 communication data First communication data part acquisition means for acquiring a plurality of parts, the first communication control data included in the first communication data main body part, and the first communication control data included in the first communication data overlapping part And a first communication control data error detecting means for detecting an error in the first communication control data by comparing the first communication control data and the first communication control data. Second communication data acquiring means for acquiring second communication data including second communication control data having a predetermined relationship with the data, and second transmission data generating means for generating second transmission data including the second communication data The transmission means transmits the second transmission data, the reception means receives the second transmission data transmitted by the first communication apparatus, and the second communication apparatus , The first communication Based on the error detection result of the control data error detecting means, the second communication control is performed based on the first communication control data included in the first transmission data received by the receiving means and the predetermined relationship. Included in the second communication control data acquisition means for acquiring the communication data, the second communication control data acquired by the second communication control data acquisition means, and the second transmission data received by the reception means And second communication control data error detecting means for detecting an error in the second communication control data by comparing the second communication control data with each other.

  According to this, it is possible to increase the amount of data that can be included in the data transmission unit while performing error detection of communication control data by repeat processing.

  In the communication system, the second communication control data acquisition means is received by the reception means when the error detection result of the first communication control data error detection means indicates that there is no error. The second communication control data may be acquired based on the first communication control data included in the first transmission data and the predetermined relationship.

  According to this, the second control data can be acquired from the first communication control data in which no error is detected.

  A communication system according to another aspect of the present invention is a communication system in which a first communication device and a second communication device are connected for communication, and the first communication device is a first communication device. Data, second data having a predetermined relationship with the first data, acquisition means for acquiring the data, and transmission means for transmitting the first data a plurality of times, the second communication device comprising: A receiving means for receiving the first data transmitted by the first communication device a plurality of times, and a plurality of the first data received by the receiving means are compared with each other, thereby correcting an error in the first data. Error detecting means for detecting, wherein the transmitting means transmits the second data, the receiving means receives the second data transmitted by the first communication device, and the second communication The apparatus detects the detection result of the error detection means And a second data acquisition means for acquiring the second data based on the first data received by the reception means and the predetermined relationship, wherein the error detection means is received by the reception means. The second data and the second data acquired by the second data acquiring means are compared with each other to detect an error in the second data.

  According to this, when transmitting data having a predetermined relationship for each data transmission unit such as communication control data, it becomes possible to perform error detection by repeat processing without performing repeat processing.

  The communication device according to the present invention includes: a receiving unit that receives first transmission data including first communication control data from a partner device; and the first transmission data received by the receiving unit. First communication control data acquisition means for acquiring communication control data, and when the first transmission control data is included in the first transmission data in the acquisition, First communication control data error detecting means for detecting an error in the first communication control data by comparing the first communication control data contained therein, and the first communication control data According to the error detection result of the error detection means, the second communication control data is acquired based on the first communication control data included in the first transmission data received by the reception means. Second communication control included in second communication control data acquisition means, the second communication control data acquired by the second communication control data acquisition means, and second transmission data received from the counterpart device And a second communication control data error detecting means for detecting an error in the second communication control data by comparing them with each other.

  The data processing method according to the present invention is a data processing method in a communication device that receives transmission data including communication control data from a partner device. The first transmission data including first communication control data from the partner device. A first communication control data acquisition step for acquiring the first communication control data from the received first transmission data; and in the acquisition, the first transmission data is added to the first transmission data. When one communication control data is duplicated, the first communication control data is compared with each other to detect an error in the first communication control data. According to the error detection result in the first communication control data error detection step and the first communication control data error detection step, the received communication Based on the first communication control data included in one transmission data, the second communication control data acquisition step for acquiring the second communication control data and the second communication control data acquisition step By comparing the second communication control data with the second communication control data included in the second transmission data received from the counterpart device, an error in the second communication control data can be determined. And a second communication control data error detecting step for detecting.

  Further, in the above data processing method, if no error is detected as a result of error detection in the first communication control data acquisition step, to the other device, so as not to include communication control data redundantly in the transmission data, It may be requested.

  In this way, the counterpart device can transmit the communication control data to the transmission data according to whether or not the communication device can acquire the communication control data that should be included in the transmission data that is subsequently received. It becomes possible to determine whether or not to include a duplicate.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a system configuration and functional blocks of a communication system 1 according to the present embodiment. As shown in the figure, the communication system 1 includes a communication device 10 and a communication device 20, and these are connected to communicate with each other. In the present embodiment, description will be made assuming that communication device 10 transmits data and communication device 20 receives the data.

  Each of the communication device 10 and the communication device 20 is a computer including a CPU and a memory. The CPU is a processing unit for executing a program stored in the memory, and performs processing for controlling each part of each device and realizes functions described later. The memory stores programs and data for carrying out the present embodiment. It also operates as a work memory for the CPU.

  As shown in FIG. 1, the communication device 10 functionally includes a repeat control unit 11, a communication content data acquisition unit 12, a communication control data addition unit 13, a repeat unit 14, an encoding unit 15, and a modulation / transmission unit 16. The communication device 20 functionally includes a reception / demodulation unit 21, a decoding unit 22, a communication content data acquisition unit 23, a main body partial communication control data acquisition unit 24, and an overlapping partial communication control data acquisition unit 25. , An error detection unit 26, a communication control data acquisition unit 27, a communication control data storage unit 28, and a communication control data acquisition unit 29.

  The repeat control unit 11 determines to perform the repeat process for the first data transmission unit transmitted at the start of communication, and determines not to perform the repeat process for the subsequent data transmission unit. The repeat control unit 11 controls the communication content data acquisition unit 12 and the repeat unit 14 according to this determination.

  The communication content data acquisition unit 12 acquires communication content data for each data amount in a data transmission unit, and outputs the communication content data to the communication control data adding unit 13. The amount of data in this data transmission unit differs between when the repeat process is performed and when the repeat process is not performed.

  Here, the difference in data amount due to the repeat processing will be described. When the repeat process is performed, all of the communication data (the communication content data acquired by the communication content data acquiring unit 12 plus the communication control data acquired by the communication control data adding unit 13 described later) Or include some duplicates. Since the data amount of the communication control data cannot be changed in principle, the data amount of the communication data is adjusted by adjusting the data amount of the communication content data acquired by the communication content data acquiring unit 12 depending on whether or not the repeat process is performed. Is kept constant.

  However, for example, when the present embodiment is applied to packet communication, the data amount of communication control data can be adjusted by the header compression technique. In such a case, it is preferable to adjust the data amount of the communication content data according to the data amount of the communication control data, and as a result, keep the data amount of the communication data constant.

  In the repeat process performed in the present embodiment, the communication control data portion is included redundantly in the communication data.

  The communication control data adding unit 13 acquires communication data obtained by adding communication control data to the communication content data output from the communication content data acquiring unit 12 and outputs the communication data to the repeat unit 14. Here, the communication control data differs for each data transmission unit to be sequentially transmitted, but the communication control data added to each data transmission unit has a predetermined relationship with each other. Specifically, it includes data common to data transmission units transmitted sequentially (such as a destination address) and data related to the transmission order of data transmission units (such as a sequence number).

  The repeat unit 14 is a communication data unit including a communication data main body part composed of all communication data and a part constituting communication control data in the communication data with respect to a data transmission unit for performing repeat processing. Transmission data including the overlapping portion is generated. On the other hand, for data transmission units that are not subjected to repeat processing, transmission data including all communication data is generated.

  The encoding unit 15 encodes the transmission data generated by the repeat unit 14. The modulation / transmission unit 16 modulates the transmission data encoded by the encoding unit 15 and transmits the modulated transmission data to the communication device 20.

  The reception / demodulation unit 21 receives and demodulates transmission data transmitted by the communication device 10. The decoding unit 22 decodes the transmission data demodulated by the reception / demodulation unit 21.

  The communication content data acquisition unit 23 extracts the communication data body portion from the transmission data decrypted by the decryption unit 22, and further acquires communication content data therefrom.

  The main body partial communication control data acquisition unit 24 extracts the communication data main body portion from the transmission data decoded by the decoding unit 22, and further acquires communication control data therefrom.

  The overlapping part communication control data acquisition unit 25 determines whether or not the communication data overlapping part is included in the transmission data decoded by the decoding part 22, and if included, the communication data overlapping part is used for communication control. Get the data.

  The error detection unit 26, when the communication control data is acquired by the overlapping partial communication control data acquisition unit 25, the communication control data acquired by the main body partial communication control data acquisition unit 24 and the overlapping partial communication control The communication control data acquired by the data acquisition unit 25 is compared with each other to detect an error in the communication control data. That is, if there is a different part in both communication control data, that part is detected as an error part.

  The communication control data acquisition unit 27 acquires communication control data according to the error detection result of the error detection unit 26. Specifically, when no error is detected, the communication control data acquired by the main body partial communication control data acquisition unit 24 is acquired. The communication control data acquisition unit 27 stores the communication control data acquired in this way in the communication control data storage unit 28.

  The communication control data acquisition unit 29 receives transmission data subsequently received based on the communication control data stored in the communication control data storage unit 28 and the predetermined relationship between the communication control data described above. Get communication control data that should be included in. For example, based on the communication control data included in a certain transmission data and the predetermined relationship between the communication control data described above, the communication control to be included in the transmission data received subsequent to the transmission data When acquiring the communication data, the communication control data acquiring unit 29 acquires the communication control data by keeping the common data as it is and incrementing the data related to the transmission order by a predetermined number.

  The error detection unit 26, when the communication control data is not acquired by the overlapping partial communication control data acquisition unit 25, the communication control data acquired by the main body partial communication control data acquisition unit 24 and the communication control data By comparing the communication control data acquired by the acquisition unit 29 with each other, an error in the communication control data is detected. That is, if there is a different part in both communication control data, that part is detected as an error part. Thus, the error detection unit 26 performs error detection by the repeat process without performing the repeat process.

  FIGS. 2 to 8 are diagrams for explaining a specific example when the configuration according to the communication system 1 described above is applied to a mobile communication system. In the specific example described here, the communication device 10 is a base station device in a mobile communication system, the communication device 20 is the mobile station device, and the transmission data is packet data broadcast by the base station device. Hereinafter, this specific example will be described in detail with reference to FIGS.

  2 and 3 are diagrams illustrating a processing flow of the communication device 10. As shown in the figure, the communication device 10 starts communication, secures a storage area for a variable N, and substitutes 1 (S1). Then, the frame format used in the communication is determined (S2). Here, the following three types of formats are used, that is, one in which repeat processing is always performed in 1ch communication (FF (Format Flag) = 00 or 11), and one in which repeat processing is performed only at initialization in 1ch communication (FF = 01). In the following description, it is assumed that any one of the two-channel communication that performs the repeat process only during initialization (FF = 10) is used.

  Next, the communication apparatus 10 determines whether or not N = 1 (S3), and shifts the process to S4 if N = 1 and to S14 if N = 1. The process of S3 is performed to determine whether or not it is a communication start time.

  In S4, the communication apparatus 10 determines whether or not the FF is 10. If FF is not 10, data of up to 140 bits (communication content data) is acquired (S5), communication control data (33 bits) is added thereto, and communication data of up to 173 bits is acquired (S6). Then, repeat processing is performed for the communication control data, and transmission data of the main body portion 173 bits and the overlapping portion 33 bits is acquired (S7). When the communication content data is less than 140 bits, the communication content data may be repeated. That is, the amount of data that can be transmitted at one time in the wireless section is determined in advance, and here the number of bits of transmission data is 206 bits, so the repeat process is performed within a range not exceeding this. FIG. 5 is a diagram schematically showing a format of transmission data acquired at this time.

  If FF is 10 in S4, the maximum 118-bit data (communication content data) is acquired from the 1st and 2nd channels (S8), and the communication control data (44 bits) is added to this to acquire the maximum 162-bit communication data. (S9). Then, repeat processing is performed for the communication control data, and transmission data of the main body portion 162 bits and the overlapping portion 44 bits is acquired (S10). When the communication content data is less than 118 bits, the communication content data may be repeated. Also in this case, the repeat process is performed in a range where the number of bits of transmission data does not exceed 206 bits. FIG. 6 is a diagram schematically showing a format of transmission data acquired at this time. As shown in the figure, 22 bits of the 44 bits of communication control data are common to the first and second channels, and the remaining 22 bits are communication control data for each channel (11 bits for each channel).

  The communication apparatus 10 adds a CRC (cyclic redundancy code) 16 bits and a tail append bit 8 bits for convolution processing to the transmission data acquired in S7 or S10, and performs convolution processing (S11). This convolution process is an encoding process in which the number of bits is doubled. Therefore, the number of bits of data obtained by convolution is (206 + 16 + 8) × 2 = 460 bits. That is, in this mobile communication system, the amount of data that can be transmitted at one time in the radio section is 460 bits, and the amount of data transmitted is 206 bits so that the amount of data after encoding is 460 bits.

  The communication device 10 modulates and transmits the encoded data (S12), and increments N by 1 (S13). Then, the process returns to S3.

  As described above, if N = 1 in S3, the communication apparatus 10 proceeds to S14. In S14, the communication apparatus 10 determines whether FF is 00 or 11. If FF is 00 or 11, the communication apparatus 10 moves the process to S5. If FF is not 00 or 11, the communication apparatus 10 determines whether or not to initialize (S15). The initialization here means that the repeat process is performed again, and is performed in response to a request from the communication device 20 as will be described later. If it is determined that initialization is to be performed, the communication device 10 moves the process to S5.

  If it is determined that initialization should not be performed, the communication device 10 determines whether FF is 01 or not. If FF is 01, the communication device 10 acquires data of up to 173 bits (communication content data), and communication data of up to 206 bits obtained by adding communication control data (33 bits) to this is used as transmission data (S17). ). FIG. 7 is a diagram schematically showing a format of transmission data acquired at this time. If the FF is not 01, the communication device 10 acquires data of up to 162 bits (communication content data) from the 1st and 2nd channels, and adds communication control data (44 bits) to this data up to 206 bits of communication data. It is set as transmission data (S18). FIG. 8 is a diagram schematically showing a format of transmission data acquired at this time. The communication apparatus 10 that has acquired the transmission data in this way moves the process to S11.

  Next, FIG. 4 is a diagram illustrating a processing flow of the communication device 20. As shown in the figure, the communication device 20 receives and demodulates transmission data (S20) and decodes (S21). It is preferable that error correction by CRC is performed on the decoded data.

  The communication device 20 acquires the main body portion from the decrypted transmission data, and acquires communication control data according to the format (S22). That is, the part which is communication control data is acquired among the main-body parts.

  Moreover, the communication apparatus 20 acquires an overlap part from the decoded transmission data, and acquires communication control data according to the format (S23). Here, since the overlapping part cannot be acquired when the overlapping part is not included, the communication device 20 determines whether or not the overlapping part has been acquired (S24). If not acquired, the process proceeds to S25.

  In S26, the communication device 20 performs error detection by comparing the communication control data acquired in S22 with the communication control data acquired in S23.

  In S25, the communication apparatus 20 acquires the communication control data that should be included in the overlap based on the communication control data stored by the process in S29 described later. Then, the communication device 20 performs error detection by comparing the communication control data acquired in S22 with the communication control data acquired in S25 (S27).

  The communication device 20 determines whether or not an error is detected as a result of the error detection performed in S26 or S27 (S28). If no error is detected, the communication device 20 stores communication control data (S29), and further formats In response to this, the communication content data is acquired (S30). On the other hand, when an error is detected, an initialization process is requested to the communication device 10 (S31). The communication device 10 makes an affirmative determination in S15 when the initialization process is thus requested.

  As described above, according to the communication system of the present invention, it is possible to increase the amount of data that can be included in a data transmission unit while performing error detection of communication control data by repeat processing. Further, when transmitting data having a predetermined relationship for each data transmission unit such as communication control data, it is possible to perform error detection by repeat processing without performing repeat processing.

  In the above embodiment, the communication control data included in each data transmission unit has been described as having a predetermined relationship. However, the actual communication control data has a portion having a predetermined relationship and a portion having no predetermined relationship. include. In the above-described embodiment, the portion having no predetermined relationship is included in the communication content data.

  The error detection unit 26 compares the communication control data acquired by the main body partial communication control data acquisition unit 24 with the communication control data acquired by the duplicate partial communication control data acquisition unit 25. If no error is detected as a result of error detection, the communication device 10 is requested not to perform repeat processing, and the repeat control unit 11 is requested not to perform repeat processing. Alternatively, it may be determined not to perform the repeat process. In this way, the communication device 10 repeats depending on whether or not the communication control data acquisition unit 29 can acquire the communication control data that should be included in the subsequently received transmission data. It will be possible to determine the execution of the process.

It is a figure which shows the system configuration | structure and functional block of the communication system concerning embodiment of this invention. It is a figure which shows the processing flow of the transmission side communication apparatus at the time of applying embodiment of this invention to a mobile communication system. It is a figure which shows the processing flow of the transmission side communication apparatus at the time of applying embodiment of this invention to a mobile communication system. It is a figure which shows the processing flow of the receiving side communication apparatus at the time of applying embodiment of this invention to a mobile communication system. It is a figure which shows the transmission data format at the time of applying embodiment of this invention to a mobile communication system. It is a figure which shows the transmission data format at the time of applying embodiment of this invention to a mobile communication system. It is a figure which shows the transmission data format at the time of applying embodiment of this invention to a mobile communication system. It is a figure which shows the transmission data format at the time of applying embodiment of this invention to a mobile communication system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Communication system 10,20 Communication apparatus, 11 Repeat control part, 12 Communication content data acquisition part, 13 Communication control data addition part, 14 Repeat part, 15 Encoding part, 16 Modulation / transmission part, 21 Reception / demodulation part , 22 Decoding unit, 23 Communication content data acquisition unit, 24 Main body partial communication control data acquisition unit, 25 Duplicate partial communication control data acquisition unit, 26 Error detection unit, 27, 29 Communication control data acquisition unit, 28 Communication Data storage unit for control.

Claims (6)

A communication system in which a first communication device and a second communication device are connected for communication,
The first communication device is:
First communication data acquisition means for acquiring first communication data including first communication control data;
A first communication data main body portion constituted by the first communication data, and a first communication data overlapping portion constituted by including the first communication control data in the first communication data. First transmission data generating means for generating transmission data;
Transmitting means for transmitting the first transmission data;
Including
The second communication device is:
Receiving means for receiving first transmission data transmitted by the first communication device;
First communication data part obtaining means for obtaining the first communication data body part and the first communication data overlapping part from the first transmission data received by the receiving means;
By comparing the first communication control data included in the first communication data main body portion with the first communication control data included in the first communication data overlapping portion, the first communication First communication control data error detecting means for detecting an error in the control data;
Including
The first communication device is:
Second communication data acquisition means for acquiring second communication data including second communication control data having a predetermined relationship with the first communication control data;
Second transmission data generating means for generating second transmission data including the second communication data;
Further including
The transmission means transmits the second transmission data;
The receiving means receives the second transmission data transmitted by the first communication device;
The second communication device is:
Based on the first communication control data included in the first transmission data received by the receiving means and the predetermined relationship, according to the error detection result of the first communication control data error detecting means, Second communication control data acquisition means for acquiring second communication control data;
The second communication control data acquired by the second communication control data acquisition means and the second communication control data included in the second transmission data received by the receiving means are compared with each other. A second communication control data error detecting means for detecting an error in the second communication control data;
including,
A communication system characterized by the above. The communication system according to claim 1,
The second communication control data acquisition means is included in the first transmission data received by the reception means when the error detection result of the first communication control data error detection means indicates that there is no error. Obtaining the second communication control data based on the first communication control data and the predetermined relationship.
A communication system characterized by the above. A communication system in which a first communication device and a second communication device are connected for communication,
The first communication device is:
Acquisition means for acquiring first data and second data having a predetermined relationship with the first data;
Transmitting means for transmitting the first data a plurality of times;
Including
The second communication device is:
Receiving means for receiving each of the first data transmitted by the first communication device a plurality of times;
An error detection means for detecting an error in the first data by comparing a plurality of the first data received by the receiving means;
Including
The transmission means transmits the second data,
The receiving means receives the second data transmitted by the first communication device;
The second communication device is:
Second data acquisition means for acquiring the second data based on the first data received by the reception means and the predetermined relationship in accordance with a detection result of the error detection means;
Further including
The error detecting means detects an error in the second data by comparing the second data received by the receiving means with the second data acquired by the second data acquiring means. To
A communication system characterized by the above. Receiving means for receiving first transmission data including first communication control data from a counterpart device;
First communication control data acquisition means for acquiring the first communication control data from the first transmission data received by the reception means;
In the acquisition, when the first transmission control data is duplicated in the first transmission data, by comparing the duplicated first communication control data with each other, First communication control data error detecting means for detecting an error in the first communication control data;
Based on the error detection result of the first communication control data error detection means, based on the first communication control data included in the first transmission data received by the reception means, the second communication control data is Second communication control data acquisition means for acquiring;
Comparing the second communication control data acquired by the second communication control data acquisition means with the second communication control data included in the second transmission data received from the counterpart device A second communication control data error detecting means for detecting an error in the second communication control data,
A communication device comprising: In a data processing method in a communication device that receives transmission data including communication control data from a counterpart device,
A receiving step of receiving first transmission data including first communication control data from the counterpart device;
A first communication control data acquisition step of acquiring the first communication control data from the received first transmission data;
In the acquisition, when the first transmission control data is duplicated in the first transmission data, by comparing the duplicated first communication control data with each other, A first communication control data error detection step for detecting an error in the first communication control data;
According to an error detection result in the first communication control data error detection step, second communication control data is acquired based on the first communication control data included in the received first transmission data. A second communication control data acquisition step to
Comparing the second communication control data acquired in the second communication control data acquisition step with the second communication control data included in the second transmission data received from the counterpart device. A second communication control data error detection step for detecting an error in the second communication control data,
A data processing method comprising: As a result of error detection in the first communication control data acquisition step, if no error is detected, request the counterpart device not to include communication control data redundantly in the transmission data.
The data processing method according to claim 5, wherein:

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