JP5077168B2 - Wireless reader / writer - Google Patents

Wireless reader / writer Download PDF

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JP5077168B2
JP5077168B2 JP2008239288A JP2008239288A JP5077168B2 JP 5077168 B2 JP5077168 B2 JP 5077168B2 JP 2008239288 A JP2008239288 A JP 2008239288A JP 2008239288 A JP2008239288 A JP 2008239288A JP 5077168 B2 JP5077168 B2 JP 5077168B2
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communication
time
process
carrier
required
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JP2010072918A (en
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啓太 坪田
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株式会社デンソーウェーブ
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/40According to the transmission technology
    • Y02D70/42Near-field transmission systems, e.g. inductive or capacitive coupling

Description

  The present invention relates to a wireless reader / writer.

Conventionally, RFID systems have been widely provided as systems for performing wireless communication using electromagnetic waves as a medium. This system is generally composed of an RFID tag and a reader / writer (wireless reader / writer), and performs radio communication with an RFID tag attached to a moving body or the like using radio waves or the like by a reader / writer. It is configured to read various data or write various data to the RFID.
JP 2007-323590 A

  By the way, the wireless reader / writer used in the system may be restricted in terms of carrier output time. For example, in the Radio Law, as shown in FIG. 6A, the carrier on time is determined to be 1 s at the longest, and if it exceeds 1 s, the carrier must be turned off. In addition, there is a restriction that once the carrier is turned off, the shortest 0.1s off state must be continued. When such a restriction is imposed, there is a problem that the carrier off time arrives in the middle of the communication process and the communication process is forcibly interrupted.

  FIG. 6B is an explanatory diagram of a specific example, and shows an example in which the carrier off time arrives (that is, the carrier on time is forcibly ended) during the n-th communication process. As in this example, conventionally, the n-th communication process that has not been completed at the carrier-off start time (time t2) is forcibly interrupted at the carrier-off start time and treated as a process failure. . Then, the execution of the failed communication process has to wait until the carrier-off time ends, and must be retried after the start of carrier-on (after time t3). However, in the case of such a method, there is a problem that the n-th communication process performed halfway is wasted, causing a delay in communication process and an increase in power consumption.

  On the other hand, Patent Document 1 discloses a technique in which two RFID reader / writers are provided and carriers can be output continuously as a technique related to the above-described problem. However, in the case of the configuration of Patent Document 1, in addition to the need for two RFID reader / writers, a higher-level device that controls them is also required, which causes a problem that the device configuration becomes large and complicated.

  The present invention has been made to solve the above-described problem, and can realize a wireless reader / writer that can appropriately perform communication processing under the restriction while restricting the carrier on time, without increasing the size, It is an object of the present invention to provide a configuration that can shorten the processing time, save power, and reduce the size of the apparatus configuration.

  In order to achieve the above object, the invention according to claim 1 includes carrier output means for outputting a carrier, communication means for performing communication processing using the carrier output by the carrier output means, and the carrier output means. The carrier is configured to control the output of the carrier, the carrier output is forcibly turned off when the carrier output exceeds a predetermined allowable time, and the carrier is again turned off when the off state continues for a predetermined time. And an on / off control means that allows the output to be continued during the allowable time, when the communication means performs the communication process, a communication required time required for the communication process is estimated. And detecting whether the carrier is in an on state when the communication unit performs the communication process, and In addition, a calculation unit that calculates a continuable time until the allowable time for the ON state ends, and the communication required time estimated by the estimation unit is calculated based on the continuable time calculated by the calculation unit. A determination means for determining whether or not the communication required time is longer by the determination means. Before the time is over, the off-state that has been forwarded is continued for a certain period of time, and the communication means performs the communication processing related to the required communication time determined to be longer than the continuable time. And starting after the forwarded off state ends.

  According to a second aspect of the present invention, in the wireless reader / writer according to the first aspect, when the determination means determines that the required communication time is longer than the continuable time, the on / off control means During the off state, a carrier sense process is performed to confirm a vacant frequency used for the communication process performed after the forwarded off state.

  According to a third aspect of the present invention, in the wireless reader / writer according to the first or second aspect, the estimation unit is configured to perform the communication based on at least a data amount and a communication speed of data to be communicated in the communication process. The required time is estimated.

  According to a fourth aspect of the present invention, in the wireless reader / writer according to any one of the first to third aspects, the estimation unit determines a calculation formula for estimating the communication required time for each communication content. The communication required time is estimated based on at least communication contents of the communication processing to be performed by the communication means and the calculation formula data.

  According to a fifth aspect of the present invention, in the wireless reader / writer according to the fourth aspect, the calculation formula data includes a first calculation formula data used in an ID acquisition process and a second calculation used in a data reading process. If the communication process to be performed by the communication means is the ID acquisition process, the first calculation expression is included at least having formula data and third calculation formula data used in the data writing process When the communication process to be performed by the communication means is the data reading process, the communication required time is estimated based on the second calculation formula data. When the communication process to be performed by the communication means is the data writing process, the communication required time is estimated based on the third calculation formula data.

  According to the first aspect of the present invention, the required communication time is estimated for each communication process, and when it is determined that the estimated required communication time is longer than the continuable time in the on state, the start of the carrier off state is permitted. Prior to the end of (time allowed until forced to be turned off), it is moved forward. Then, after the OFF state, the communication process determined to be long is performed. In this way, it is possible to prevent the carrier from being turned off in the middle of the communication process while realizing a configuration that limits the continuation of the carrier output within a predetermined time. It is possible to effectively reduce the processing time and power consumption associated with communication processing that is forcibly interrupted halfway. In addition, the communication process determined to be long (that is, the communication process determined to be longer than the on-state continuation possible time) is performed after the forwarded off state ends, Necessary communication processing can be completed quickly and satisfactorily.

  The invention according to claim 2 performs the carrier sense process for the communication process performed after the off-state brought forward during the off-state brought forward. The carrier sense process is a process that is necessary before the communication process and does not require a carrier output. If such a process is performed using the off-state time that has been brought forward, Communication processing to be performed can be completed earlier.

  The invention according to claim 3 estimates the communication required time of the communication process based on the data amount and the communication speed of the data to be communicated in the communication process. In this way, the required communication time for each communication process can be estimated with higher accuracy.

  The invention of claim 4 includes calculation formula data in which a calculation formula for estimating the communication required time is determined for each communication content, and the communication processing is performed based on the communication content and the calculation formula data performed in the communication processing. Estimated communication time. In this way, since the required communication time can be calculated in consideration of the communication content, it is possible to estimate with higher accuracy.

  In the invention of claim 5, when the communication process is an ID acquisition process, the required communication time is estimated based on the first calculation formula data, and in the case of the data read process, based on the second calculation formula data. The required communication time is estimated, and in the case of the data writing process, the required communication time is estimated based on the third calculation formula data. In this way, at least the ID acquisition process, the data reading process, and the data writing process can calculate the communication required time using the calculation formula data suitable for each process, and the communication required time can be set for an important process that occurs frequently. It can be estimated with higher accuracy.

[First embodiment]
Hereinafter, a first embodiment in which the non-contact communication apparatus of the present invention is embodied will be described with reference to the drawings.
FIG. 1 is a block diagram schematically illustrating an electrical configuration of the wireless reader / writer according to the first embodiment. 2 is an explanatory diagram for explaining the relationship between carrier-on time, carrier-off time, and communication processing. FIG. 3 is an explanatory diagram for explaining the relationship between carrier-on time, carrier-off time, communication processing, and carrier sense processing. FIG. FIG. 4 is a flowchart illustrating the flow of carrier on / off control processing, and FIG. 5 is a flowchart illustrating the flow of required communication time calculation processing in the on / off control processing of FIG.

First, the electrical configuration of the wireless reader / writer 1 will be described with reference to FIG.
The wireless reader / writer 1 is configured as an RFID reader / writer that performs non-contact communication with, for example, an IC card or another RFID tag. The wireless reader / writer 1 includes a CPU 2 and storage means (not shown) such as a ROM and a RAM, and is configured to be entirely controlled by the CPU 2. In addition, the wireless reader / writer 1 is provided with a carrier oscillator 3, an amplifier 4, a transmission unit filter 5, an encoding unit 6, a modulation unit 7, a matching circuit 13, and the like as circuits constituting the transmission side. On the reception side, a reception unit filter 8, an amplifier 9, a demodulation unit 10, a binarization processing unit 11, and a decoding unit 12 are provided.

  The encoding unit 6 is connected to the CPU 2 and is configured to encode the transmission data output from the CPU 2 and output it to the modulation unit 7. For example, the modulation unit 7 performs ASK on the carrier (carrier wave) having a frequency of 950 MHz output from the carrier oscillator 3 by the encoded transmission code (modulation signal) output from the encoding unit 6 when transmitting a command to the communication target. (Amplitude Shift Keying) A modulated modulated signal is generated and output to the amplifier 4. The operation / stop of the oscillation operation of the carrier oscillator 3 is controlled by the CPU 2. The carrier oscillator 3 corresponds to an example of “carrier output means”.

  The amplifier 4 is configured to amplify an input signal (a modulated signal modulated by the modulation unit 7) with a predetermined gain, and outputs the amplified signal to the transmission unit filter 5. The transmitter filter 5 outputs the filtered transmission signal to the antenna 15 via the matching circuit 13. When a transmission signal is output to the antenna 15 in this way, the transmission signal is radiated to the outside from the antenna 15 as an electromagnetic wave.

  On the other hand, the signal received via the antenna 15 is filtered by the receiver filter 8, amplified by the amplifier 9, supplied to the demodulator 10, and demodulated. The demodulated signal waveform is binarized by the binarization processing unit 11 and then decoded by the decoding unit 12. The decrypted received data is output to the CPU 2.

Next, a characteristic configuration of the present embodiment will be described.
The wireless reader / writer 1 of the present embodiment is configured such that the maximum duration (allowable time) of the carrier-on state is determined in advance, and is controlled by the CPU 2 so that the carrier output does not continue beyond the allowable time after reset. It has become.

  Specifically, a carrier time monitoring timer 20 (hereinafter also referred to as a timer 20) is connected to the CPU 2, and it is determined whether or not the allowable time is exceeded based on a signal of the timer 20. This timer 20 indicates the remaining time (residual time) during which the carrier can be kept on, and when the carrier off state continues for a certain period of time or when the process of S8 (described later) in FIG. 4 is performed. And is configured as a countdown timer that starts when carrier output is started after reset. The timer 20 is configured to indicate the maximum duration (allowable time) at the count start time (that is, the carrier output start time), and to decrease the remaining time as time elapses from the start. The remaining time becomes zero when an allowable time (for example, 1 s) has elapsed since the start.

  The CPU 2 monitors the remaining time information output from the timer 20 and controls the carrier oscillator 3 so that the carrier is forcibly turned off when the remaining time becomes zero. In addition, after the carrier output is forcibly turned off, the carrier oscillator 3 is controlled so that the off state is continued for a certain time (for example, 0.1 s) and then the carrier is turned on again. When the carrier OFF state has elapsed for a certain time, the timer 20 is reset and the remaining time reaches the maximum duration (allowable time), so that the ON state can be continued again for the maximum duration (allowable time). The CPU 2 corresponds to an example of “on / off control means”.

  The CPU 2 corresponds to an example of “communication means” and functions to perform communication processing using the carrier output from the carrier oscillator 3. Specifically, when the carrier is on, the CPU 2, the encoding unit 6, the modulation unit 7, the amplifier 4, the transmission unit filter 5, the matching circuit 13, the antenna 15, the reception unit filter 8, the amplifier 9, and the demodulation unit 10 The binarization processing unit 11 and the compounding unit 12 cooperate to perform communication processing. These functions are as described above. Further, as shown in FIG. 2, a plurality of communication processes can be continuously executed in the on state.

In the present embodiment, the control as shown in FIGS. 4 and 5 is further performed while taking the above-described configuration.
The on / off control process of FIG. 4 is a process performed by the CPU 2 before the start of each communication process. When the process is started, it is first determined whether or not the carrier is in an on state (S1). Immediately after the start of the on / off control process, the carrier is in an off state, so the process proceeds to No in S1, switches the carrier to an on state (S7), and resets the timer 20 (S8). In the process of S8, a reset signal is output from the CPU 2 to the timer 20, and the timer 20 that has acquired the reset signal sets the remaining time (remaining carrier continuation time) to the maximum duration (allowable time, for example, 1s). The countdown starts with the set status.

  On the other hand, if it is determined in S1 that the carrier is in an on state, the process proceeds to Yes in S1, and a process of reading the remaining time (the remaining carrier continuation possible time) in which the current carrier on state can be continued is performed (S2). In this process, the remaining time is acquired from the timer 20 and stored in a memory (not shown).

  Thereafter, a communication required time calculation process is performed (S3). The process of S3 is performed according to the flow as shown in FIG. 5, for example. First, the communication content of the communication process to be performed is confirmed (S10).

  In this embodiment, a calculation formula for estimating the communication required time is determined for each communication content, and the communication required time is estimated using a calculation formula corresponding to the communication content of the communication processing to be performed. . Specifically, the first calculation formula data used in the ID acquisition process, the second calculation formula data used in the data reading process, and the third calculation formula data used in the data writing process, Is stored in a memory (not shown), and the communication process to be performed is an ID acquisition process, the process proceeds from S10 to S11, and the required communication time is estimated based on the first calculation formula data. The first calculation formula data obtains the communication required time X as X = A × B / C (first calculation formula) using the traffic A, the number of slots B used in the collision prevention process, and the communication speed C as parameters. If the communication content is ID acquisition processing and the communication amount A, the number of slots B used in the collision prevention processing, and the communication speed C are known, the communication required time X can be calculated from the first calculation formula data. .

  If the communication process to be performed is a data read process, the process proceeds from S10 to S12, and the required communication time is estimated based on the second calculation formula data. The second calculation formula data is data in which the communication amount A and the communication speed C are used as parameters, and the communication required time X is obtained by X = A / C (second calculation formula). In this case, if the communication amount A and the communication speed C are known, the communication required time X can be calculated by the second calculation formula data.

  If the communication process to be performed is a data write process, the process proceeds from S10 to S13, and the required communication time is estimated based on the third calculation formula data. The third calculation formula data is data in which the communication amount A, the communication speed C, and the tag writing required time D are used as parameters, and the communication required time X is obtained by X = A / C + D. If the communication amount A, the communication speed C, and the tag writing required time D are known, the communication required time X can be calculated from the third calculation formula data. The tag writing required time D can be stored in advance as a predetermined value, for example.

  After the process of S3, the determination process of S4 is performed. In the determination process in S4, the remaining time read in S2 (current on-time continuation possible time) is compared with the required communication time X calculated in S3, and whether or not the remaining time is equal to or longer than the required communication time. Determine whether. If the remaining time is equal to or longer than the required communication time, it is considered that the communication process is completed while the ON state is continued. In addition, after the on / off control process is completed, the communication process that is the determination target (that is, the communication process in which the communication required time is calculated in S3) is performed.

  On the other hand, if it is determined in the determination process of S4 that the remaining time is not longer than the required communication time, the process proceeds to No in S4, switches to the carrier off state without waiting for the end of the allowable time (S5), and the carrier off state is constant Wait until a time (for example, 0.1 s) elapses (S6). After a certain period of time has passed in the off state, the carrier is again switched to the carrier on state (S7), the timer 20 is reset (S8), and the process ends. S7 and S8 are as described above. Thus, in this embodiment, when it is determined that the required communication time is longer than the remaining time, the start of the carrier off state is advanced before the current on state allowable time ends, and The off state brought forward is continued for a certain period of time. Then, the communication process to be determined (that is, the communication process related to the required communication time determined to be longer than the remaining time in S4) is started after the forward-off state is completed.

  The CPU 2 corresponds to an example of “estimating means”, and has a function of estimating a communication required time required for the communication process when the communication process is performed. Further, the CPU 2 corresponds to an example of “calculation means”, and detects whether the carrier is in an on state when performing communication processing, and in the case of the on state, permits the on state. It functions to calculate the continuation time (remaining time) until the time ends. The CPU 2 corresponds to an example of “determination means”, and has a function of determining whether or not the estimated required communication time is longer than the calculated continuous time (remaining time).

  When the on / off control as described above is performed, for example, as shown in FIG. 2 (that is, the end of the (n-1) th communication process is time T4, the end of the allowable time is time T2, and the (n-1) th time. Even when the n-th communication process is performed immediately after the n-th communication process, the n-th process is performed immediately after the n-1th process. Without starting, the start of the off state can be advanced to time T4 (that is, immediately after the completion of the (n-1) th process), and the end time when the off state is continued for a certain time (for example, 0.1 s) is also the time. It is possible to advance from T3 (end time when continuing for a certain time from time T2) to time T5.

  Further, when it is determined in S4 that the required communication time is longer than the remaining time, and the OFF state is advanced as shown in FIG. 2 (that is, when the processes of S5 and S6 are performed), as shown in FIG. During the forward-off state, carrier sense processing can be performed to confirm the vacancy of the frequency used for the communication processing (n-th communication processing in FIG. 3) performed after the forward-off state. If this carrier sense process is completed, for example, by the end of the off state (time T5), the nth communication process can be started immediately after the end of the off state.

According to the configuration of the present embodiment, for example, the following effects can be obtained.
In the present embodiment, the required communication time is estimated for each communication process, and when it is determined that the estimated required communication time is longer than the continuable time of the on state, the start of the carrier off state is permitted (forcing The time allowed to be turned off automatically is advanced before the end). Then, after the OFF state, the communication process determined to be long is performed. In this way, it is possible to prevent the carrier from being turned off in the middle of the communication process while realizing a configuration that limits the continuation of the carrier output within a predetermined time. It is possible to effectively reduce the processing time and power consumption associated with communication processing that is forcibly interrupted halfway. In addition, the communication process determined to be long (that is, the communication process determined to be longer than the on-state continuation possible time) is performed after the forwarded off state ends, Necessary communication processing can be completed quickly and satisfactorily.

  In addition, carrier sense processing is performed on communication processing performed after the forward-off state during the forward-off state. The carrier sense process is a process that is necessary before the communication process and does not require a carrier output. If such a process is performed using the off-state time that has been brought forward, Communication processing to be performed can be completed earlier.

  Further, the communication required time for the communication process is estimated based on the data amount and the communication speed of the data to be communicated in the communication process. In this way, the required communication time for each communication process can be estimated with higher accuracy.

  In addition, the calculation formula data for estimating the communication required time is provided for each communication content, and the communication required time for the communication processing is calculated based on the communication content and the calculation formula data performed in the communication processing. Estimated. In this way, since the required communication time can be calculated in consideration of the communication content, it is possible to estimate with higher accuracy.

  If the communication process is an ID acquisition process, the communication required time is estimated based on the first calculation formula data. If the communication process is a data read process, the communication required time is calculated based on the second calculation formula data. In the case of the data writing process, the communication required time is estimated based on the third calculation formula data. In this way, at least the ID acquisition process, the data reading process, and the data writing process can calculate the communication required time using the calculation formula data suitable for each process, and the communication required time can be set for an important process that occurs frequently. It can be estimated with higher accuracy.

[Other Embodiments]
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  In the above embodiment, the communication required time is calculated using a calculation formula determined for each communication content. However, the communication required time may be calculated using a uniform calculation formula regardless of the communication content. For example, the communication required time may be calculated based on the communication amount and the communication speed for any communication content.

  In the said embodiment, although the example which estimates communication required time was shown, the estimation method is not limited to this. For example, the required communication time may be estimated based on the actual measurement time of communication processing that has already been performed. As an example, it is possible to use a method in which the communication amount, communication speed, and actual measurement time of each communication process are stored, and the required communication time is estimated based on the stored data. For example, when estimating the required communication time for a communication process that is going to be performed at a certain communication speed, sample data (communication amount, actual measurement time) of the communication process already performed at the same communication speed can be used. In this case, if the communication amount of the communication processing to be performed is the same or almost the same as the sample data, the actual measurement time may be used as the communication required time. If the communication amount is different from the sample data, the actual measurement time of the sample data is set. What is necessary is just to increase / decrease (for example, change in proportion to the amount of communication).

FIG. 1 is a block diagram schematically illustrating an electrical configuration of the wireless tag reader according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating the relationship between the carrier on time, the carrier off time, and the communication processing. FIG. 3 is an explanatory diagram for explaining the relationship between carrier-on time, carrier-off time, communication processing, and carrier sense processing. FIG. 4 is a flowchart illustrating the flow of the on / off control process. FIG. 5 is a flowchart exemplifying the flow of processing for calculating the required communication time in the on / off control process of FIG. FIG. 6 is an explanatory diagram for explaining a conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wireless reader / writer 2 ... CPU (Communication means, on / off control means, estimation means, calculation means, judgment means)
3 ... Carrier oscillator (carrier output means)

Claims (5)

  1. Carrier output means for outputting a carrier;
    Communication means for performing communication processing using the carrier output by the carrier output means;
    The carrier output means is configured to control the carrier output, and when the carrier output exceeds a predetermined allowable time, the carrier output is forcibly turned off, and the off state continues for a predetermined time. An on / off control means for allowing the output of the carrier to continue again in the allowable time in the case,
    A wireless reader / writer equipped with
    When the communication unit performs the communication process, an estimation unit that estimates a communication required time required for the communication process;
    When the communication means performs the communication process, it detects whether or not the carrier is in an on state, and in the case of the on state, the continuable time until the allowable time for the on state ends is determined. A calculating means for calculating;
    Determining means for determining whether the required communication time estimated by the estimating means is longer than the continuable time calculated by the calculating means;
    Have
    The on / off control means, when the determining means determines that the required communication time is longer, causes the start of the off-state of the carrier to advance before the end of the allowable time, and the off-state that has been advanced Let the state continue for a certain period of time,
    The wireless reader / writer is characterized in that the communication means starts the communication process related to the required communication time determined to be longer than the continuable time after the forwarded off state ends.
  2.   When the determination means determines that the required communication time is longer than the continuable time, the communication processing performed after the forwarded off state during the off state forwarded by the on / off control means The wireless reader / writer according to claim 1, wherein carrier sense processing is performed to check a free frequency used for the wireless communication.
  3.   3. The wireless reader according to claim 1, wherein the estimation unit estimates the required communication time based on at least a data amount and a communication speed of data to be communicated in the communication processing. lighter.
  4. The estimation means includes
    Computation formula data that defines a computation formula for estimating the required communication time for each communication content,
    The said communication required time is estimated based on the communication content of the said communication process to be performed by the said communication means, and the said calculation formula data, The Claim 1 characterized by the above-mentioned. Wireless reader / writer.
  5. The calculation formula data includes a first calculation formula data used in the ID acquisition process, a second calculation formula data used in the data reading process, and a third calculation formula data used in the data writing process. And at least
    If the communication process to be performed by the communication means is the ID acquisition process, the communication required time is estimated based on the first calculation formula data,
    When the communication process to be performed by the communication means is the data read process, the communication required time is estimated based on the second calculation formula data,
    5. The wireless communication according to claim 4, wherein when the communication process to be performed by the communication means is the data writing process, the communication required time is estimated based on the third calculation formula data. Reader / writer.
JP2008239288A 2008-09-18 2008-09-18 Wireless reader / writer Active JP5077168B2 (en)

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JP4548394B2 (en) * 2006-07-20 2010-09-22 株式会社デンソーウェーブ Data transmission equipment
JP4893211B2 (en) * 2006-10-04 2012-03-07 株式会社デンソーウェーブ RF tag system and control apparatus for RF tag reader
JP4917425B2 (en) * 2006-12-28 2012-04-18 株式会社ユニバーサルエンターテインメント Wireless IC tag reading device, its control device, and wireless IC tag reading system

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