JP6376451B2 - Communication device, communication system, communication control method, and communication control program - Google Patents

Description

The present invention relates to a communication device , a communication system, a communication control method and a communication control program , and more particularly to a radio communication system used in a mobile phone network.

  In data communication, a communication service using LTE (Long Term Evolution) has been developed. On the other hand, for voice calls, services have been provided by circuit switching using circuit switched fallback (CSFB: Circuit Switched Fallback). However, recently, introduction of voice services using LTE has been studied by means called VoLTE (registered trademark) (Voice over LTE).

  On the other hand, in packet communication in LTE, the receiving apparatus returns an acknowledgment (ack) or a negative acknowledgment (nack) to a packet for every fixed amount to the transmitting apparatus that has transmitted the packet. “ack” and “nack” are responses indicating normal reception and responses indicating normal reception, respectively. When the transmitting device receives ack or ack (ack / nack), data transmission / reception is completed.

  In voice communication such as VoLTE, the amount of information required for transmission is not large, but data is transmitted at predetermined time intervals. In this case, the terminal device, at the time interval, (a) uplink data transmission, (b) ack / nack reception for uplink data, (c) downlink data reception, (d) ack / nack for downlink data. Repeat the operation of sending. The terminal device consumes power each time transmission and reception are performed. For transmission / reception of periodic data, Patent Document 1 discloses DRX (intermittent reception) or DTX (intermittent reception) by adjusting the DRX (intermittent reception) cycle according to the communication status between the terminal device and the base station device. A communication system in which power saving is achieved by shifting to (transmission) is described. Specifically, when the transmission timing of the quality of the downlink transmission path measured by the terminal device overlaps with the transmission timing of ack / nack, the terminal device does not transmit ack / nack. Therefore, when there is a deviation in the amount of data between uplink data and downlink data as in normal data communication, power saving is effective.

Japanese Patent No. 4841630

  However, when a relatively small amount of data is transmitted at a predetermined time interval as in voice communication using VoLTE, the terminal device regularly repeats the above (a) to (d). become. Transmission timing of transmission data and transmission timing of ack / nack with respect to received data do not overlap, quality and ack / nack are transmitted separately, and the terminal starts up each time, so power saving has not been effectively done The problem that has arisen. This activation is separate from the activation at the time of data transmission / reception, and this point is also a factor that cannot sufficiently achieve power saving.

The present invention has been made in view of the above points, and provides a communication device , a communication system, a communication control method, and a communication control program capable of reducing power consumption when data is periodically transmitted and received .

The present invention has been made to solve the above problems, and one aspect of the present invention is a first response signal indicating whether or not the first data transmitted by the external device every predetermined time has been normally received. And a transmission signal processing unit that generates second data to be transmitted to the external device at the predetermined time, and the transmission timing of the first response signal and the transmission timing of the second data match. A transmission data timing calculation unit that calculates at least one of transmission timing of one response signal and transmission timing of the second data, and the transmission signal processing unit is a first response signal calculated by the transmission data timing calculation unit passing transmission timing, to determine if slower than the reference time is determined as a first response signal of the current cycle, the transmission timing of the first response signal to the time until the reference time It is a device.

  According to the present invention, power consumption can be reduced when data is periodically transmitted and received.

It is a block diagram which shows the structural example of the communication system in the 1st Embodiment of this invention. It is a block diagram which shows the structure of the terminal device which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the base station apparatus which concerns on the 1st Embodiment of this invention. It is a timing chart which shows the example of the timing which data is transmitted / received by the 1st Embodiment of this invention. It is a flowchart which shows the communication control process which concerns on the 1st Embodiment of this invention. It is a timing chart which shows the example of the timing which data is transmitted / received by the 2nd Embodiment of this invention. It is a flowchart which shows the communication control process which concerns on the 2nd Embodiment of this invention. It is a timing chart which shows the example of the timing which data is transmitted / received by the 3rd Embodiment of this invention. It is a flowchart which shows the communication control process which concerns on the 3rd Embodiment of this invention. It is a timing chart which shows another example of the timing which data is transmitted / received. It is a flowchart which shows the communication control process which concerns on the 4th Embodiment of this invention. It is a flowchart which shows the communication control process which concerns on the 5th Embodiment of this invention.

(First embodiment)
First, a first embodiment of the present invention will be described.
FIG. 1 is a block diagram illustrating a configuration example of a communication system 1 in the present embodiment.
The communication system 1 includes a terminal device 10 and a base station device 20. The communication system 1 is a wireless communication network compliant with LTE, for example.

The terminal device 10 is a communication device having a communication function for transmitting and receiving data wirelessly at regular time intervals with a communication partner device (not shown) via the base station device 20. Such a communication function is, for example, a voice communication function. The terminal device 10 is, for example, a mobile phone (including a so-called smartphone), a tablet terminal device, a wireless communication card, or the like.
The base station device 20 communicates with the terminal device 10 and the counterpart device that are located within a range (cell) where radio waves from the own device reach via a core network (not shown) in which the own device is accommodated. Relay data between them.
In the example illustrated in FIG. 1, the number of terminal apparatuses 10 and base station apparatuses 20 is one for the sake of explanation, but the present invention is not limited to this. The number of terminal devices 10 and base station devices 20 may be plural.

Next, the configuration of the terminal device 10 will be described.
FIG. 2 is a block diagram illustrating a configuration of the terminal device 10 according to the present embodiment.
The terminal device 10 includes a communication unit 11 and a control unit 12.
The communication unit 11 performs communication with the base station apparatus 20 using the LTE method. The communication unit 11 includes an LTE transmission unit 111 and an LTE reception unit 112. The LTE transmission unit 111 and the LTE reception unit 112 are each connected to an antenna.
The LTE transmission unit 111 wirelessly transmits uplink (UL) data input from the control unit 12 to the base station apparatus 20 via an antenna using the LTE scheme. In addition, the LTE transmission unit 111 transmits a response signal (ack / nack) to downlink (DL) data input from the control unit 12 to the base station apparatus 20.

The LTE receiving unit 112 receives DL data from the base station apparatus 20 via an antenna, and outputs the received DL data to the control unit 12. Note that the LTE receiving unit 112 receives a response signal (ack / nack) from the base station apparatus 20 to the UL data via an antenna, and outputs the received response signal to the control unit 12.
The communication unit 11 can perform processing related to communication control such as call connection with the base station device 20, communication start, communication end, and the like.

  The control unit 12 functions as a reception signal processing unit 121, a transmission data timing calculation unit 122, and a transmission signal processing unit 123, and executes various processes. The control unit 12 includes a processing device such as a CPU (Central Processing Unit) and a main storage device such as a RAM (Random Access Memory) and a ROM (Read Only Memory). The control unit 12 provides the functions of the above-described members by executing a predetermined control program. Further, the control unit 12 may execute a predetermined application program and provide a function related to communication such as voice communication with a counterpart device.

  The reception signal processing unit 121 performs predetermined processing on the DL data input from the LTE reception unit 112. For example, the received signal processing unit 121 performs known error detection correction on the DL data and determines the processing result. The processing result includes (i) when no error is detected, (ii) when the detected error is successfully corrected, and (iii) when the detected error is unsuccessfully corrected. The reception signal processing unit 121 outputs processing result information indicating the processing result to the transmission signal processing unit 123. Further, the control unit 12 outputs the DL data subjected to the error detection and correction process to a known communication function unit (not shown). A communication function part performs the process for exhibiting the function of communication. For example, the communication function unit decodes received data included in DL data. When the decoded signal is audio data, the control unit 12 outputs the audio data to an acoustic reproduction unit (not shown).

The transmission data timing calculation unit 122 compares the transmission timing of the response signal with respect to the DL data generated by the transmission signal processing unit 123 with the transmission timing of the UL data. The response signal is a signal indicating a response (ack / nack) corresponding to the DL data processing result by the reception signal processing unit 121.
The transmission data timing calculation unit 122 calculates the transmission timing of the UL data so that the transmission timing of the response signal with respect to the DL data matches the transmission timing of the UL data, and the UL data transmission timing is calculated at the calculated transmission timing. Correct the transmission timing. The transmission data timing calculation unit 122 outputs transmission timing information indicating the corrected transmission timing to the transmission signal processing unit 123.

When the transmission data timing calculation unit 122 calculates the transmission timing of UL data, the timing of the next DL data reception slot received by the communication unit 11 from the base station apparatus 20 and the response signal (ack / nack) for the UL data Based on the time until the reception timing, the transmission timing of the UL data is calculated.
Note that the transmission data timing calculation unit 122 is connected via the LTE reception unit 212 at the time of negotiation performed at the time of call connection from the terminal device 10 to the base station device 20 or at predetermined time intervals (for example, subframes). A DL data reception slot is received. Also, the transmission data timing calculation unit 122 outputs transmission timing information indicating the calculated transmission timing of the UL data to the transmission signal processing unit 123.

  The transmission signal processing unit 123 generates UL data including transmission data (for example, audio data) input from a communication function unit (not shown). The transmission signal processing unit 123 outputs the generated UL data to the LTE transmission unit 111 at the transmission timing indicated by the transmission timing information input from the transmission data timing calculation unit 122. Thereby, the transmission signal processing unit 123 can cause the LTE transmission unit 111 to transmit UL data at the timing calculated by the transmission data timing calculation unit 122.

  On the other hand, the transmission signal processing unit 123 generates a response signal (ack / nack) based on the processing result information input from the reception signal processing unit 121. The transmission signal processing unit 123, when the processing result information (i) when no error is detected, or (ii) when the detected error is successfully corrected, an acknowledgment (indicating that the signal has been successfully received) ack) is generated. The transmission signal processing unit 123 generates a response signal indicating a negative response (nack) indicating that the processing result information (iii) cannot be normally received when correction of the detected error has failed. The transmission signal processing unit 123 outputs the generated response signal (ack / nack) to the LTE transmission unit 111. Thereby, the transmission signal processing unit 123 can cause the LTE transmission unit 111 to transmit the generated response signal (ack / nack).

Next, the configuration of the base station apparatus 20 will be described.
FIG. 3 is a block diagram illustrating a configuration of the base station apparatus 20 according to the present embodiment.
The base station apparatus 20 includes a communication unit 21 and a control unit 22.
The communication unit 21 performs communication with the terminal device 10 using the LTE method. The communication unit 21 includes an LTE transmission unit 211 and an LTE reception unit 212. The LTE transmission unit 211 and the LTE reception unit 212 are each connected to an antenna.
The LTE transmission unit 211 wirelessly transmits the DL data input from the control unit 22 to the terminal device 10 via the antenna using the LTE scheme. In addition, the LTE transmission unit 211 transmits a response signal (ack / nack) to the UL data input from the control unit 22 to the terminal device 10.

The LTE receiving unit 212 wirelessly receives UL data from the terminal device 10 via the antenna, and outputs the received UL data to the control unit 22. Note that the LTE receiving unit 212 receives a response signal (ack / nack) to the DL data from the terminal device 10 via an antenna, and outputs the received response signal to the control unit 22.
The communication unit 21 can perform processing related to communication control such as call connection with the terminal device 10, communication start and end, and the like.

  The control unit 22 functions as a reception signal processing unit 221 and a transmission signal processing unit 223, and executes various processes. The controller 22 includes a processing device such as a CPU and a main storage device such as a RAM and a ROM. The control unit 22 provides the above-described functions by executing a predetermined control program.

  The reception signal processing unit 221 performs predetermined processing on the UL data input from the LTE reception unit 212. For example, the reception signal processing unit 221 performs known error detection correction on the UL data, and determines the processing result. The reception signal processing unit 221 outputs processing result information indicating the processing result to the transmission signal processing unit 223. In addition, the control unit 22 transmits the UL data subjected to the error detection and correction process to a counterpart device (not shown) via a core network (not shown).

The transmission signal processing unit 223 generates DL data having a predetermined data format including reception data received from a counterpart device (not shown) via a core network (not shown). The transmission signal processing unit 223 outputs the generated DL data to the LTE transmission unit 211.
On the other hand, the transmission signal processing unit 223 generates a response signal (ack / nack) based on the processing result information input from the reception signal processing unit 121 in the same manner as the transmission signal processing unit 123 (FIG. 2). The transmission signal processing unit 223 outputs the generated response signal (ack / nack) to the LTE transmission unit 211.

Next, communication control according to the present embodiment will be described.
FIG. 4 is a timing chart showing an example of timing at which data is transmitted and received according to the present embodiment.
FIGS. 4A to 4D show the reception data (DL) received by the terminal device 10 and the transmission data (UL) to be transmitted in each row, respectively. The end point of the solid arrow indicates a response signal (ack / nack) for the data indicated at the start point. The horizontal axis indicates time. Each of the series of squares forming each row represents a slot. A slot is a unit time in which data transmission / reception timing is controlled. In the example shown in FIG. 4, the period of 1 slot (slot length) is 1 ms. This 1 ms corresponds to the subframe length in the LTE scheme.
On the other hand, the transmission cycle in which UL data is transmitted and the reception cycle in which DL data is received are each 20 ms. The transmission cycle and the reception cycle are not limited to this, and can be set according to the processing unit (frame length) in the voice codec used in the terminal device 10 or the constituent devices of the core network. The slot length may be a period shorter than the transmission cycle and the reception cycle. The slot length may be 0.5 ms, for example. This 0.5 m corresponds to the slot length in the LTE system.

  FIG. 4A shows a slot of DL data received by the LTE receiving unit 112 of the terminal apparatus 10 with vertical stripes, and a response signal (ack) transmitted by the LTE transmitting unit 111 for the received DL data. / Nack) slots are indicated by horizontal stripes. The received DL data is referred to as DATA01, DATA02,. In the example shown in FIG. 4A, the response signal (ack / nack) for the received DL data is transmitted 2 ms after the time when the DL data is received.

  FIG. 4B shows the slots of the UL data transmitted by the LTE transmission unit 111 of the terminal device 10 with vertical stripes, and the response signal (ack) received by the LTE reception unit 112 with respect to the transmitted UL data. / Nack) slots are indicated by horizontal stripes. The transmitted UL data is referred to as DATA11, DATA12,. In the example shown in FIG. 4B, the response signal (ack / nack) to the transmitted UL data is received 2 ms after the time when the UL data is transmitted.

  FIG. 4C illustrates received data (DL), transmission data (UL), and operation time (active time) of the terminal device 10 when the DL data reception time and the UL data transmission time are not adjusted as in the prior art. Is shown on each line. The operation time is a time during which the terminal apparatus 10 performs an operation related to transmission / reception, that is, a slot period during which received data (DL) is received at a time and a slot period during which transmission data (UL) is transmitted at a time. Including. In the third row of FIG. 4C, the operation time is indicated by a square protrusion whose height is higher than the surroundings, and the rest time is indicated by the other part. In the example shown in FIG. 4C, since the time at which the reception data (DL) is received and the section in which the transmission data (UL) is transmitted do not overlap, the set of operation times is the period of the DL data slot, The period of the response signal (ack / nack) slot for the DL data, the period of the UL data slot, and the period of the slot of the response signal (ack / nack) for the UL data are simply combined.

  FIG. 4D shows reception data (DL), transmission data (UL), and operation time (active time) of the terminal device 10 in each row when the transmission timing of UL data is adjusted according to the present embodiment. As described above, the transmission data timing calculation unit 122 transmits the UL data so that the timing of the next DL data reception slot matches the reception timing of the response signal (ack / nack) for the current UL data. Calculate timing. A dashed arrow indicates that the transmission timing of UL data is adjusted from the timing indicated at the starting point to the timing indicated at the ending point.

Of the received data (DL) shown in FIG. 4D, a rectangle filled with a lattice pattern indicates a slot in which a response signal (ack / nack) for DL data and UL data is received. These slots indicate that the transmission timings of DATA11, DATA12, and DATA13 are adjusted to match the reception timings of the response signals (ack / nack) and DATA02, DATA03, and DATA04, respectively.
The portion indicated by shading in the third row indicates a slot that is no longer operating time due to adjustment of transmission timing. In this example, at the reception timing of the response signal (ack / nack) for each of DATA01, DATA02, and DATA03 before adjustment, the terminal device 10 does not perform an operation related to transmission / reception. Therefore, the power consumption related to the operation is reduced.

In addition, the reception timing in the transmission destination device of the transmission partner changes by adjusting the transmission timing of the UL data. However, the transmission destination device typically includes an audio codec that decodes audio data received as UL data and a fluctuation buffer that supplies UL data to the audio codec at predetermined time intervals. The audio data is decompressed by decoding, and the timing supplied to the audio codec by the fluctuation buffer is adjusted. Since changes in reception timing are absorbed in these processes, there is no particular problem in practical use.
For example, when audio data is transmitted / received every 20 ms, the fluctuation buffer stores the audio data in the destination device, and the audio codec decompresses the supplied audio data every 20 ms. Therefore, as in the above-described example, even if the transmission timing of UL data is delayed by several ms, the phenomenon that the expanded audio data is temporarily interrupted (so-called sound interruption) does not occur.

FIG. 5 is a flowchart showing a communication control process according to the present embodiment.
(Step S <b> 101) The LTE receiving unit 112 receives DL data from the base station apparatus 20. Thereafter, the process proceeds to step S102.
(Step S <b> 102) The reception signal processing unit 121 performs predetermined processing on the DL data received by the LTE reception unit 112. Thereafter, the process proceeds to step S103.
(Step S103) The transmission signal processing unit 123 generates a response signal (ack / nack) based on the processing result for the DL data. Thereafter, the process proceeds to step S104.
(Step S104) The LTE transmission unit 111 transmits a response signal (ack / nack) to the DL data to the base station apparatus 20. Thereafter, the process proceeds to step S105.

(Step S105) The transmission signal processing unit 123 generates UL data. Thereafter, the process proceeds to step S106.
(Step S106) The LTE transmission unit 111 transmits UL data to the base station apparatus 20 at the timing calculated by the transmission data timing calculation unit 122. Thereafter, the process proceeds to step S107.

(Step S107) The transmission data timing calculation unit 122 compares the transmission timing of the response signal to the DL data generated by the transmission signal processing unit 123 with the transmission timing of the UL data. Thereafter, the process proceeds to step S108.
(Step S108) The transmission data timing calculation unit 122 determines whether or not both the transmission timing of the response signal to the DL data and the transmission timing of the UL data match. If it is determined that they match (YES in step S108), the process proceeds to step S110. If it is determined that they do not match (NO in step S108), the process proceeds to step S109.
(Step S109) The transmission data timing calculation unit 122 calculates the transmission timing of the UL data so that the transmission timing of the response signal to the DL data matches the transmission timing of the UL data with the transmission timing of the response signal (ack / nack). The UL data transmission timing is corrected to the calculated transmission timing. Then, it progresses to step S110.

(Step S110) The LTE receiving unit 112 receives DL data from the base station apparatus 20. Then, it progresses to step S111.
(Step S <b> 111) The LTE receiving unit 112 transfers the received DL data to the received signal processing unit 121. Thereafter, the process proceeds to step S112.
(Step S112) The control unit 12 determines whether or not to end the call based on a control signal generated by execution of the communication application in the own unit or received from the counterpart device. The control signal for instructing the end of conversation may be generated by a user operation input. If it is determined that the call is to be ended, the processing shown in FIG. 5 is terminated.

As described above, the terminal device 10 according to the present embodiment includes the first data that the base station device 20 transmits every predetermined time and the second data that is transmitted to the base station device 20 every predetermined time (for example, (UL data) is provided with an LTE receiver 112 that receives a second response signal (for example, a response signal to UL data) indicating whether or not the base station apparatus 20 has successfully received the data. In addition, the terminal apparatus 10 receives a first response signal (for example, a response signal for DL data) indicating whether or not the first data (for example, DL data) transmitted by the base station apparatus 20 every predetermined time has been normally received. The base station apparatus 20 includes a transmission signal processing unit 123 that generates the second data every predetermined time. Further, the terminal device 10 includes a transmission data timing calculation unit 122 that calculates the transmission timing of the second data so that the reception timing of the second response signal matches the reception timing of the first data.
According to this configuration, since the reception timing of the second response signal matches the reception timing of the first data in the terminal device 10, the reception of the second response signal and the reception of the first data are asynchronous. The number of receptions decreases. Therefore, power consumption related to reception can be reduced.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and description is used.
However, in the communication system 1 according to the present embodiment, the transmission data timing calculation unit 122 of the terminal device 10 stands by until the next UL data is generated. The transmission data timing calculation unit 122 determines the transmission timing of the response signal (ack / nack) for the DL data generated by the transmission signal processing unit 123 to be equal to the transmission timing of the next UL data. Then, the transmission signal processing unit 123 causes the LTE transmission unit 111 to transmit the response signal (ack / nack) to the base station apparatus 20 at the transmission timing determined by the transmission data timing calculation unit 122.

Next, communication control according to the present embodiment will be described.
FIG. 6 is a timing chart showing an example of timing at which data is transmitted and received according to the present embodiment.
FIG. 6A shows the same DL data reception slot as that shown in FIG. 4A and the transmission slot of the response signal (ack / nack) for the DL data. FIG. 6 (b) shows the same DL data transmission as shown in FIG. 4 (b) and the reception slot of the response signal (ack / nack) for the DL data. FIG. 6C shows the same reception data (DL), transmission data (UL), and operation time (active time) of the terminal device 10 as shown in FIG. 4C in each row.

  FIG. 6D shows received data (DL), transmission data (UL), and operation time of the terminal device 10 when the transmission timing of a response signal (ack / nack) for DL data is adjusted according to the present embodiment. (active time) is shown in each line. The transmission data timing calculation unit 122 transmits the response signal (ack / nack) so that the timing of the UL data transmission slot of the next cycle matches the transmission timing of the response signal (ack / nack) for the DL data of the current cycle. Calculate the transmission timing.

  Of the transmission data (UL) shown in FIG. 6D, a square filled with a lattice pattern indicates a slot in which a response signal (ack / nack) for the UL data and DL data is transmitted. In these slots, the transmission timings of response signals (ack / nack) for DATA01, DATA02, and DATA03 in FIG. 6D are adjusted so as to match the transmission timings of DATA11, DATA12, and DATA13, respectively. Indicates. The portion indicated by shading in the third row indicates a slot that is no longer operating time due to adjustment of transmission timing. In this example, the terminal apparatus 10 does not perform an operation related to transmission / reception at the transmission timing of the response signal (ack / nack) for each of DATA01, DATA02, and DATA03 before adjustment. Therefore, the power consumption related to the operation is reduced as compared with that before adjustment of the transmission timing.

In the above description, the case of adjusting the transmission timing of the response signal (ack / nack) for DL data has been described as an example, but the present invention is not limited thereto. The transmission data timing calculation unit 122 may calculate the UL data transmission timing so that the transmission timing of the UL data in the next cycle matches the transmission timing of the response signal (ack / nack) for the DL data in the current cycle. Good. In this case, the transmission signal processing unit 123 causes the LTE transmission unit 111 to transmit the UL data to the base station apparatus 20 at the transmission timing determined by the transmission data timing calculation unit 122. Also in this case, the power consumption in the terminal device 10 can be reduced.
Note that, as described above, even if the UL data transmission timing is adjusted, a phenomenon in which the decompressed audio data is temporarily interrupted in the transmission destination device does not occur.

FIG. 7 is a flowchart showing communication control processing according to the present embodiment.
The communication control process according to the present embodiment includes steps S101 to S103, S105, S110 to S112 (FIG. 5), S204, S206, S208, and S209.
In the process shown in FIG. 7, after steps S101 to S103 are completed, step S105 is performed, and then the process proceeds to step S204.

(Step S204) Based on the transmission timing calculated by the transmission data timing calculation unit 122, the transmission signal processing unit 123 matches the transmission timing of the response signal (ack / nack) to the DL data with the transmission timing of the UL data. Thereafter, the process proceeds to step S206.
(Step S206) The LTE transmission unit 111 transmits a response signal (ack / nack) and UL data for DL data to the base station apparatus 20. Thereafter, the process proceeds to step S208.

(Step S208) The transmission data timing calculation unit 122 determines whether or not the transmission timings of the response signal (ack / nack) and DL data for the UL data match. If it is determined that they match (YES in step S208), the process proceeds to step S110. If it is determined that they do not match (NO in step S208), the process proceeds to step S209.

(Step S209) The transmission data timing calculation unit 122 calculates the transmission timing of the response signal (ack / nack) for DL data such that the transmission timings of both the response signal (ack / nack) and UL data for the DL data match. . The transmission data timing calculation unit 122 corrects the transmission timing of the response signal (ack / nack) to the calculated transmission timing. Then, it progresses to step S110.

As described above, in the terminal device 10 according to the present embodiment, the first response signal (for example, DL data) indicating whether or not the first data transmitted by the base station device 20 every predetermined time has been normally received. And a transmission signal processing unit 123 that generates second data (for example, UL data) to be transmitted to the base station apparatus 20 every predetermined time. Further, the terminal device 10 calculates transmission data for calculating at least one of the transmission timing of the first response signal and the transmission timing of the second data so that the transmission timing of the first response signal matches the transmission timing of the second data. A timing calculation unit 122 is provided.
According to this configuration, since the transmission timing of the first response signal matches the transmission timing of the second data in the terminal device 10, the transmission of the first response signal and the transmission of the first data are asynchronous. The number of transmissions decreases. Therefore, power consumption related to transmission can be reduced.

(Third embodiment)
Next, a third embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and description is used.
However, in the communication system 1 according to the present embodiment, the transmission data timing calculation unit 122 of the terminal device 10 stands by until the next UL data is generated. The transmission data timing calculation unit 122 determines the transmission timing of the response signal (ack / nack) for the DL data generated by the transmission signal processing unit 123 to be equal to the transmission timing of the next UL data. Further, the transmission data timing calculation unit 122 determines that the transmission timing of the UL data generated by the transmission signal processing unit 123 includes the reception timing of the response signal (ack / nack) for the next DL data and the reception timing for the next DL data. Set to be equal.
The transmission signal processing unit 123 causes the LTE transmission unit 111 to transmit a response signal (ack / nack) and UL data to the base station apparatus 20 at the transmission timing determined by the transmission data timing calculation unit 122.

Next, communication control according to the present embodiment will be described.
FIG. 8 is a timing chart showing an example of timing at which data is transmitted and received according to the present embodiment.
FIG. 8A shows the same DL data reception slot as that shown in FIG. 4A and the response signal (ack / nack) transmission slot for the DL data. FIG. 8 (b) shows the same DL data transmission as shown in FIG. 4 (b) and a reception slot for a response signal (ack / nack) to the DL data. FIG. 8C shows reception data (DL), transmission data (UL), and operation time (active time) of the terminal device 10 in each row, which is the same as that shown in FIG.

  FIG. 8D shows reception data (DL), transmission data (UL), and operation time (active time) of the terminal device 10 in each row when the transmission timing of UL data is adjusted according to the present embodiment. The transmission data timing calculation unit 122 responds to the DL data so that the timing of the UL data transmission slot of the next cycle and the transmission timing of the response signal (ack / nack) for the DL data of the current cycle match. (nack) transmission timing is calculated. In addition, the transmission data timing calculation unit 122 calculates the transmission timing for the UL data so that the reception timing of the response signal (ack / nack) for the UL data in the next cycle is equal to the reception timing for the DL data in the next cycle. To do.

  Of the transmission data (UL) shown in FIG. 8D, the squares indicated by the end points of the two dashed arrows are the response signals (ack / nack) for DATA01, DATA02, and DATA03, and DATA11, DATA12, A slot in which DATA 13 is transmitted. Also, among the received data (DL) shown in FIG. 8D, the squares filled with the lattice pattern receive the response signals (ack / nack) for DATA02, DATA03, DATA04, and DATA11, DATA12, DATA13, respectively. Indicates the slot to be played. In these slots, the transmission timings of response signals (ack / nack) for DATA01, DATA02, and DATA03 respectively match the transmission timings of DATA11, DATA12, and DATA13, and the transmission timings of these slots are DATA11, DATA12, It shows that the reception timing of the response signal (ack / nack) for each of DATA 13 and the reception timing of DATA 02, DATA 03, and DATA 04 are adjusted to be equal to each other. The portion indicated by shading in the third row indicates a slot that is no longer operating time due to adjustment of transmission timing. In this example, the terminal apparatus 10 performs an operation related to transmission / reception at the transmission timing of the response signal (ack / nack) to each of DATA01, DATA02, and DATA03 before adjustment and at the transmission timing of DATA11, DATA12, and DATA13 before adjustment. Absent. Therefore, the power consumption related to the operation is further reduced.

FIG. 9 is a flowchart showing communication control processing according to the present embodiment.
The communication control process according to the present embodiment includes steps S101-S103, S105, S110-S112 (FIG. 5), S204, S206 (FIG. 7), and S307-S309.
In the process shown in FIG. 7, after steps S101 to S103 are completed, steps S105, S204, and S206 are executed, and then the process proceeds to step S307.

(Step S307) The transmission data timing calculation unit 122 compares the reception timings of the response signal (ack / nack) for the current period UL data and the next period DL data. Thereafter, the process proceeds to step S308.
(Step S308) When the transmission data timing calculation unit 122 determines that the reception timings of the response signal (ack / nack) for the current period UL data and the DL data for the next period are the same (YES in Step S308) The process proceeds to step S110. If it is determined that they do not match (NO in step S308), the process proceeds to step S309.

(Step S309) The transmission data timing calculation unit 122 matches the reception timing of the response signal (ack / nack) for the current period UL data and the next period DL data, and the response signal for the DL data of the current period. The transmission timing of UL data is calculated so that the transmission timing of (ack / nack) and UL data coincide. The transmission data timing calculation unit 122 corrects the UL data transmission timing to the calculated transmission timing. Then, it progresses to step S110.

As described above, in the terminal device 10 according to the present embodiment, the transmission data timing calculation unit 122 further determines whether or not the base station device 20 has successfully received the second data (for example, UL data). The transmission timing of the second data is calculated so that the reception timing of the second response signal (for example, a response signal for UL data) shown matches the reception timing of the first data (for example, DL data).
According to this configuration, since the reception timing of the second response signal and the reception timing of the first data match in the terminal device 10, the transmission timing of the first response signal and the transmission timing of the second data simply match The number of transmissions is further reduced. Therefore, the power consumption related to transmission can be further reduced.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and description is used.

  In the communication system 1 according to the above-described embodiment, the transmission signal processing unit 123 of the terminal device 10 makes the transmission timing of the response signal (ack / nack) for the generated DL data equal to the transmission timing of the next UL data. May be adjusted. Moreover, when the response signal with respect to the transmitted UL data indicates a negative response “nack”, the transmission signal processing unit 123 may retransmit the UL data to the base station device 20 via the LTE transmission unit 111.

  The received signal processing unit 221 of the base station apparatus 20 sends a response signal (ack / nack) to the retransmitted DL data and a response signal (ack / ack) to the DL data of the next cycle for the DL data periodically transmitted. discriminating time β is set. For this reason, the transmission timing of the response signal (ack / nack) for the DL data may be adjusted to be delayed from the determination time β.

  For example, as shown in FIG. 10D, it is assumed that DATA11, DATA12, and DATA13 are transmitted to the base station apparatus 20 simultaneously with response signals (ack / nack) to DATA01, DATA02, and DATA03. In the example shown in FIG. 10D, the terminal device 10 receives the response signals (ack / nack) for DATA11, DATA12, and DATA13, and receives the data 02, DATA03, and DATA04, which are DL data of the next cycle. Delayed from the timing. Therefore, the base station apparatus 20 may not correctly determine whether the received response signal (ack / nack) is a response signal corresponding to DL data of any cycle. Also, the timing at which DATA02, DATA03, and DATA04, which are DL data of the next cycle, are received differs from the timing at which a response signal (ack / nack) for UL data is received. In the example shown in FIG. 10D, since the operation related to reception is performed for each of the response signals (ack / nack) for DL data and UL data, the operation time is not reduced and the power consumption is not reduced.

Therefore, the transmission signal processing unit 123 of the terminal device 10 according to the present embodiment performs a response signal (ack / nack) for DL data rather than a transmission time (hereinafter referred to as a reference time α) corresponding to the determination time β in the cycle. It is determined whether or not the transmission timing after the adjustment is late. The reference time α is a time earlier than the determination time β by a time corresponding to a propagation delay between the terminal device 10 and the base station device 20 and a processing delay.
If the transmission signal processing unit 123 determines that it is later than the reference time α, the transmission signal processing unit 123 does not adjust the transmission timing of the response signal (ack / nack) for the DL data.
Thereby, the reception signal processing unit 221 of the base station apparatus 20 correctly determines what response data (ack / nack) the response signal (ack / nack) received from the terminal apparatus 10 corresponds to. Can do.
Note that the transmission signal processing unit 123 may receive data indicating the reference time α from the reception signal processing unit 221 of the base station apparatus 20, or the time when the reception signal processing unit 121 receives the initial transmission DL data. It may be determined according to the reception cycle.

FIG. 11 is a flowchart showing communication control processing according to the present embodiment.
The communication control process according to the present embodiment includes steps S101-S103, S105, S110-S112 (FIG. 5), S204, S206 (FIG. 7), S307-S309 (FIG. 9), S404, and S405. It progresses to step S404 after the process of step S101-S105.

(Step S404) The transmission signal processing unit 123 determines whether or not the response signal (ack / nack) for the DL data adjusted based on the transmission timing calculated by the transmission data timing calculation unit 122 is later than the reference time α. . If it is determined to be late (YES in step S404), the process proceeds to step S405. If it is determined not to be late (NO in step S404), the process proceeds to step S204.

(Step S405) The transmission signal processing unit 123 causes the LTE transmission unit 111 to transmit the response signal (ack / nack) without adjusting the transmission timing of the response signal (ack / nack) for the DL data. Thereafter, the process proceeds to step S206. When step S405 is executed, the LTE transmission unit 111 does not transmit the response signal (ack / nack) again in step S206. In this case, in step S307, the transmission data timing calculation unit 122 transmits the response signal (ack / nack) to the current period UL data transmitted in step S405 without adjusting the transmission timing and the next period DL. Compare the transmission timing of both data. Thereafter, the process proceeds to step S308.

The communication control process shown in FIG. 11 is an example in which S404 and S405 are added to the process shown in FIG. 9, but S404 and S405 may be added to the process shown in FIG.
In the communication control process, step S404 is not necessarily executed every time. This is because, in voice communication or the like, UL data and DL data are transmitted and received at predetermined time intervals. The process of step S404 may be performed at least immediately after the connection-destination base station apparatus 20 is changed by handover at the time of connection with the base station apparatus 20.

As described above, in the terminal device 10, the transmission signal processing unit 123 determines that the transmission timing of the first response signal (for example, the response signal for DL data) calculated by the transmission data timing calculation unit 122 is the first cycle of the current period. If it is later than the reference time α determined as one response signal, the transmission timing of the first response signal is set to the time up to the reference time.
According to this configuration, the base station device 20 reliably ensures that the first response signal in the current cycle received from the terminal device 10 is not mistaken for the first response signal in the subsequent cycle, and the first response signal in the current cycle. It can be determined that it is a signal. Therefore, the received signal processing unit 221 of the base station apparatus 20 can correctly execute retransmission control based on the first response signal.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. About the same structure as embodiment mentioned above, the same code | symbol is attached | subjected and description is used.
As described above, in the communication system 1, the transmission signal processing unit 123 of the terminal device 10 may adjust the response signal (ack / nack) for DL data, and this adjustment causes the reception signal processing unit of the base station device 20 to adjust. 221 determines whether or not the response signal (ack / nack) for the DL data has been received within the reception time up to the determination time β described above.

When the reception signal processing unit 221 determines that the response signal cannot be received within the reception time for the first time, the transmission signal processing unit 223 sends the DL data of the next cycle to the terminal device 10 to the LTE transmission unit 211. Send it.
In the subsequent cycle, when the reception signal processing unit 221 determines that the response signal has been received within the reception time, the terminal device 10 is caused to transmit data corresponding to the response signal. The data corresponding to the response signal is DL data of the next period when the response signal indicates an affirmative response (ack), and when the response signal indicates a negative response (nack), DL data of the current cycle.
Further, the reception signal processing unit 221 may determine that the response signal has not been repeatedly received a predetermined number of times (for example, twice) within the reception time. In that case, the received signal processing unit 221 is the same as the DL data of the cycle (initial transmission) for the first time that it was determined that the response signal could not be received, as in the case where the response signal indicates a negative response (nack). Retransmit DL data.

FIG. 12 is a flowchart showing communication control processing according to the present embodiment.
(Step S501) The transmission signal processing unit 223 of the base station apparatus 20 sets a counter C for the number of retransmissions to an initial value of 0. Thereafter, the process proceeds to step S502.
(Step S502) The LTE transmission unit 211 transmits DL data of the cycle. Thereafter, the process proceeds to step S503.

(Step S503) The reception signal processing unit 121 of the terminal device 10 performs a predetermined process on the DL data received by the LTE reception unit 112. Thereafter, the process proceeds to step S504.
(Step S504) The transmission signal processing unit 123 generates a response signal (ack / nack) based on the processing result for the DL data. The LTE transmission unit 111 transmits the generated response signal (ack / nack) to the base station apparatus 20. Thereafter, the process proceeds to step S505.

(Step S505) The reception signal processing unit 221 of the base station device 20 determines whether or not the response signal (ack / nack) to the DL data from the terminal device 10 has not been received within the reception time that is not later than the determination time β. judge. If it is determined that reception has failed (YES in step S505), the process proceeds to step S507. If it is determined that the signal has been received (NO in step S505), the process proceeds to step S506.

(Step S506) The received signal processing unit 221 determines whether or not the received response signal indicates a negative response (nack). If it is determined that a negative response (nack) is indicated (YES in step S506), the process proceeds to step S509. When it is determined that an affirmative response (ack) is indicated (NO in step S506), the counter C is reset to 0, and the process proceeds to step S510.
(Step S507) The reception signal processing unit 221 increments the counter C by one. Thereafter, the process proceeds to step S508.
(Step S508) The reception signal processing unit 221 determines whether or not the counter C is 2 or more. If it is determined that the number is 2 or more (YES in step S508), the process proceeds to step S511. If it is determined that the value is 1 or less (NO in step S508), the process proceeds to step S510.

(Step S509) The received signal processing unit 221 determines to retransmit DL data of the current cycle in the next cycle. Thereafter, the process proceeds to step S512.
(Step S510) The reception signal processing unit 221 determines to transmit DL data of that cycle in the next cycle. Thereafter, the process proceeds to step S512.
(Step S511) The received signal processing unit 221 determines to retransmit the same DL data as the initially transmitted DL data in the next cycle. For example, when the counter C is 3, DL data three cycles before is retransmitted. Thereafter, the process proceeds to step S512.

(Step S512) The control unit 22 determines whether or not to end the call based on the control signal received from the terminal device 10 or the counterpart device. If it is determined that the call is to be ended (YES in step S512), the process shown in FIG. 12 is terminated.

When the counter C exceeds a predetermined upper limit (for example, 10), in step S512, the reception signal processing unit 221 may determine to transmit DL data of that cycle in the next cycle. The reception signal processing unit 221 may further reset the counter C to 0. This is because when the transmission data is audio data, the contents are changed each time, so that past data becomes useless.
In the above description, the case where the reception signal processing unit 221 determines to retransmit the initial DL data when the counter C is 2 or more as the predetermined number in step S508 is described as an example. It is not restricted to 1 and 3 or more may be sufficient.

As described above, the base station apparatus 20 according to the present embodiment includes the transmission signal processing unit 223 that generates the first data (for example, DL data) to be transmitted to the terminal apparatus 10 every predetermined time, and the first data. The LTE receiving unit 212 receives a first response signal (for example, a response signal to DL data) indicating whether or not the terminal apparatus 10 has successfully received the signal. When the transmission signal processing unit 223 cannot receive the first response signal by the determination time β determined as the first response signal of the current cycle, the transmission signal processing unit 223 first data (for example, initial transmission DL data) related to the first response signal. To the terminal device 10.
According to this configuration, the base station device 20 retransmits the first data without misidentifying the first response signal in the current cycle received from the terminal device 10 as the first response signal in the subsequent cycle. Can be controlled.

  If the number of times the first response signal cannot be continuously received by the determination time β is less than the predetermined number, the transmission signal processing unit 223 transmits the first data of the current period to the terminal device 10. May be. Thereby, even when the transmission signal processing unit 223 temporarily cannot receive the first response signal by the determination time β, the terminal device 10 can continuously acquire the first data of the period at that time. .

(Modification)
The embodiments of the present invention have been described in detail above with reference to the drawings. However, the specific configuration is not limited to the above-described one, and various design changes and the like can be made without departing from the scope of the present invention. Is possible.

In the above-described embodiment, the case where UL data and DL data are directly transmitted and received between the terminal apparatus 10 and the base station apparatus 20 is described as an example, but the present invention is not limited thereto. UL data and DL data may be transmitted and received between the terminal device 10 and the base station device 20 via other relay devices.
In the above-described embodiment, the communication device that processes UL data and DL data is the terminal device 10 and the base station device 20, but the present invention is not limited thereto. The communication device provided with the communication unit 11 and the control unit 12 is not limited to the terminal device 10, but other types of communication devices, for example, a base station device, a relay device, an application server device, and the like that are separate from the base station device 20. There may be. In addition, the communication device including the communication unit 21 and the control unit 22 is not limited to the base station device 20, and may be a terminal device, a relay device, an application server device, or the like that is different from the terminal device 10, for example.

The embodiment described above can also be implemented in the following manner.
(1) A first response signal indicating whether or not the first data transmitted by the external device every predetermined time has been normally received, and a transmission signal for generating second data transmitted to the external device every predetermined time A transmission unit that calculates at least one of the transmission timing of the first response signal and the transmission timing of the second data so that the transmission timing of the first response signal matches the transmission timing of the second data. A communication device comprising a data timing calculation unit.

(2) The transmission data timing calculation unit further matches a reception timing of a second response signal indicating whether the external device has successfully received the second data and a reception timing of the first data. As described above, (1) the communication device that calculates the transmission timing of the second data.

(3) When the transmission timing of the first response signal calculated by the transmission data timing calculation unit is later than a reference time determined as the first response signal of the current cycle, the transmission signal processing unit The communication device according to (1) or (2), wherein a signal transmission timing is set to a time until the reference time.

(4) a first response signal transmitted by the external device every predetermined time, and a second response signal indicating whether or not the external device has successfully received the second data transmitted to the external device every predetermined time. A first response signal indicating whether or not the first data has been normally received, a transmission signal processing unit for generating second data at the predetermined time in the external device, and the first A communication device comprising: a transmission data timing calculation unit that calculates a transmission timing of the second data so that a reception timing of two response signals matches a reception timing of the first data.

(5) A transmission signal processing unit that generates first data to be transmitted to an external device every predetermined time, and reception that receives a first response signal indicating whether or not the external device has successfully received the first data. And the transmission signal processing unit receives the first data related to the first response signal when the first response signal cannot be received by the determination time determined as the first response signal of the current period. A communication device that retransmits to the external device.

(6) A communication system including a first communication device and a second communication device, wherein the first communication device includes a first response signal indicating whether or not the first data has been successfully received. The transmission signal processing unit that generates second data to be transmitted to the second communication device at predetermined time intervals, and the transmission timing of the first response signal and the transmission timing of the second data match. A transmission data timing calculation unit that calculates at least one of a transmission timing of the first response signal and a transmission timing of the second data, and the second communication device receives the first response signal and the second data. A communication system comprising: a receiving unit that receives data; a transmission signal processing unit that generates the first data every predetermined time; and a transmission unit that transmits the first data.

(7) A communication control method for a communication device, the first response signal indicating whether or not the first data transmitted from the external device every predetermined time has been normally received, and the external device every predetermined time The transmission timing of the first response signal and the second data so that the transmission signal processing process for generating the second data to be transmitted matches the transmission timing of the first response signal and the transmission timing of the second data. And a transmission data timing calculation process for calculating at least one of the transmission timings.

(8) A communication control method for a communication device, wherein the external device can normally receive the first data transmitted from the external device every predetermined time and the second data transmitted to the external device every predetermined time. A receiving process for receiving a second response signal indicating whether or not the first data has been successfully received; a second response signal indicating whether or not the first data has been normally received; A transmission signal processing step to generate, and a transmission data timing calculation step of calculating the transmission timing of the second data so that the reception timing of the second response signal matches the reception timing of the first data. Communication control method.

(9) A first response signal indicating whether or not the first data transmitted from the external device every predetermined time has been normally received to the computer of the communication device and a second response signal transmitted to the external device every predetermined time The transmission timing of the first response signal and the transmission timing of the second data are matched so that the transmission signal processing process for generating data matches the transmission timing of the first response signal and the transmission timing of the second data. A communication control program for executing a transmission data timing calculation process for calculating at least one.

(10) Whether or not the external device has successfully received the first data transmitted to the computer of the communication device every predetermined time and the second data transmitted to the external device every predetermined time. A receiving process for receiving the second response signal, a first response signal indicating whether or not the first data has been normally received, and a transmission signal for generating the second data at the predetermined time in the external device. Communication for executing a processing step and a transmission data timing calculation step for calculating the transmission timing of the second data so that the reception timing of the second response signal matches the reception timing of the first data Control program.

Note that a part of the terminal device 10 and the base station device 20, for example, the control units 12 and 22 may be realized by a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.
Moreover, you may implement | achieve part or all of the terminal device 10 and the base station apparatus 20 in embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the terminal apparatus 10 and a part of the base station apparatus 20 may be individually made into a processor, or part or all of them may be integrated into a processor. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to the advancement of semiconductor technology, an integrated circuit based on the technology may be used.

1 ... communication system,
DESCRIPTION OF SYMBOLS 10 ... Terminal device, 11 ... Communication part, 111 ... LTE transmission part, 112 ... LTE reception part,
12 ... control unit, 121 ... reception signal processing unit, 122 ... transmission data timing calculation unit,
123 ... transmission signal processing unit,
20 ... Base station device, 21 ... Communication unit, 211 ... LTE transmission unit, 212 ... LTE reception unit,
22 ... Control unit, 221 ... Reception signal processing unit, 223 ... Transmission signal processing unit

Claims (5)

A first response signal indicating whether or not the first data transmitted by the external device every predetermined time has been normally received; and a transmission signal processing unit for generating second data transmitted to the external device every predetermined time; ,
A transmission data timing calculation unit that calculates at least one of the transmission timing of the first response signal and the transmission timing of the second data so that the transmission timing of the first response signal matches the transmission timing of the second data. and, with a,
The transmission signal processing unit transmits the first response signal when the transmission timing of the first response signal calculated by the transmission data timing calculation unit is later than a reference time determined as the first response signal of the current cycle. A communication device that determines the timing to the time until the reference time . The transmission data timing calculator is
Further, the transmission timing of the second data is set so that the reception timing of the second response signal indicating whether or not the external device has successfully received the second data matches the reception timing of the first data. The communication device according to claim 1 to calculate. A communication system including a first communication device and a second communication device, wherein the first communication device receives a first response signal indicating whether or not the first data has been normally received; A transmission signal processing unit that generates second data to be transmitted to each of the two communication devices every predetermined time, and the first response so that the transmission timing of the first response signal matches the transmission timing of the second data. A transmission data timing calculation unit that calculates at least one of a signal transmission timing and a transmission timing of the second data, and the transmission signal processing unit transmits the first response signal calculated by the transmission data timing calculation unit If the timing is later than the reference time determined as the first response signal of the current period, the transmission timing of the first response signal is set to the time up to the reference time, and the second communication device A communication unit comprising: a receiving unit that receives the first response signal and the second data; a transmission signal processing unit that generates the first data every predetermined time; and a transmission unit that transmits the first data. system. A communication control method for a communication device,
A first response signal indicating whether or not the first data transmitted by the external device every predetermined time has been normally received; and a transmission signal processing step for generating second data transmitted to the external device every predetermined time; ,
A transmission data timing calculation process for calculating at least one of the transmission timing of the first response signal and the transmission timing of the second data so that the transmission timing of the first response signal and the transmission timing of the second data match. And having
In the transmission signal processing process, when the transmission timing of the first response signal calculated in the transmission data timing calculation process is later than a reference time determined as the first response signal of the current period, The transmission timing is set to the time up to the reference time.
Communication control method . To computer of communication equipment,
A first response signal indicating whether or not the first data transmitted by the external device every predetermined time has been normally received; and a transmission signal processing procedure for generating second data transmitted to the external device every predetermined time; ,
Transmission data timing calculation procedure for calculating at least one of the transmission timing of the first response signal and the transmission timing of the second data so that the transmission timing of the first response signal matches the transmission timing of the second data And execute
In the transmission signal processing procedure, when the transmission timing of the first response signal calculated in the transmission data timing calculation procedure is later than a reference time determined as the first response signal of the current cycle, The transmission timing is set to the time up to the reference time.
Communication control program .

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