JP4154429B2 - Transmission path evaluation system and method and information terminal thereof - Google Patents

Description

  The present invention relates to a transmission path evaluation technique, and more particularly to a transmission path evaluation technique in electric field communication using an electric field transmission medium such as a human body as a transmission path.

  In recent years, electric field communication using an electric field transmission medium such as a human body as a transmission line has attracted attention. In electric field communication, for example, as shown in FIG. 8, the portable information terminal 100 is attached to a human arm, shoulder, torso, etc. via the transceiver 5 to transmit / receive data to / from each other, and with a limb on a wall, floor, etc. It communicates with a personal computer 6 provided outside via transceivers 5a and 5b and cables installed so as to be touched.

  The transceiver 5 used for the electric field communication between the portable information terminal 100 and between the portable information terminal 100 and the personal computer 6 uses, for example, a signal detection technique based on an electro-optic technique using a laser beam and an electro-optic crystal, An electric field based on information to be transmitted is induced in a living body as an electric field transmission medium, and information is transmitted / received using the induced electric field (see, for example, Patent Document 1).

  In the development stage of a computer such as a portable information terminal incorporating such a transceiver, a human body is interposed between a portable information terminal attached to a person's arm and a data collecting apparatus having a transceiver installed on the floor. The error rate of the transmitted packet is calculated, and it is verified whether the transmission path clears the error rate required for data communication.

As shown in the block diagram of FIG. 9, the conventional portable information terminal for transmission path evaluation returns the packet received by the transceiver 5 as it is as a reply packet via the packet processing device 101 such as a computer. Thereby, the data collection device detects an error of the packet returned via the portable information terminal, and calculates the error rate of the transmission path from the number of packets returned normally and the total number of transmitted packets.
JP 2001-352298 A

  However, in the conventional transmission path evaluation system in electric field communication, the packet error detected by the data collection device occurs in the upstream path from the installation side to the mobile terminal side or in the downstream path from the mobile terminal side to the installation side. Since the error rate of each of the upstream and downstream routes cannot be calculated, there is a problem that the evaluation for each transmission channel cannot be performed.

  In view of the above problems, an object of the present invention is to evaluate upstream and downstream transmission paths in electric field communication using an electric field transmission medium as a transmission path.

 A transmission line evaluation system according to a first aspect of the present invention is a transmission line evaluation system that evaluates a transmission line for electric field communication for performing data transmission between the first and second information terminals using an electric field transmission medium as a transmission line, The first information terminal includes a first storage unit that stores an expected value of data of a packet to be received, a reception unit that receives a packet transmitted from the second information terminal, and a packet received by the reception unit If the data and the expected value match, the upstream counting means for counting this packet as being normally transmitted on the upstream path and the number of packets counted by the upstream counting means are normally transmitted on the upstream path. A reply packet generating means for adding a reply packet to the packet data and a transmitting means for transmitting the reply packet to the second information terminal. The second information terminal transmits the packet to be transmitted. The second storage means for storing the total number of data and the total number of packets to be transmitted as the total number of packets transmitted on the upstream path, and the total number of packets to be transmitted between the first information terminal, Downlink counter that counts the return packet as normally transmitted on the down path when the transmission / reception means that receives the return packet matches the data of the return packet received by the transmission / reception means and the data of the packet to be sent. Means, the total number of packets transmitted on the upstream route, the number of reply packets normally transmitted on the downstream route, and the number of packets added to each reply packet, at least one of the upstream and downstream transmission routes An error rate calculating means for calculating the error rate of the transmission path.

  In the present invention, the uplink path refers to the packet transmission path from the second information terminal to the first information terminal, and the downlink path refers to the packet transmission path from the first information terminal to the second information terminal. Sure. An information terminal is an information processing device that includes elements such as a control device, an arithmetic device, an input device, an output device, and a storage device, and that can execute various processes according to a program. Information terminals are included.

  In the present invention, the number of packets normally transmitted on the upstream path is counted by the upstream counting means provided in the first information terminal, and the number of packets is added to the reply packet by the reply packet generating means. While transmitting to the information terminal on the downlink, the number of reply packets normally transmitted on the downlink by the downlink counting means provided in the second information terminal is counted, and the error rate calculating means determines the number of packets transmitted on the uplink. By calculating the error rate of at least one of the upstream and downstream transmission paths based on the total number and the number of reply packets normally transmitted on the downstream path and the number of packets added for each reply packet, the upstream path, It is possible to evaluate the transmission path of each downstream path.

  The error rate calculation means in the transmission path evaluation system reads the total number of packets to be transmitted from the second storage means as the total number of packets transmitted on the upstream path, and the number of packets normally transmitted on the upstream path on the downstream path. The maximum value is extracted from the number of packets added for each reply packet transmitted normally, and the error rate of the upstream path from the total number of packets transmitted on this upstream path and the number of packets transmitted normally on this upstream path Is calculated.

  In the present invention, the error rate calculation means reads the total number of packets to be transmitted from the second storage means as the total number of packets transmitted on the upstream path, and the downstream path as the number of packets normally transmitted on the upstream path. The maximum value is extracted from the number of packets added for each reply packet transmitted normally in the above, and the total number of packets transmitted on this uplink route and the number of packets normally transmitted on this uplink route are errors in the uplink route. By calculating the rate, it is possible to evaluate the uplink transmission path.

  Further, the error rate calculation means in the transmission path evaluation system extracts the maximum value from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink. The error rate of the downlink is calculated from the total number of reply packets transmitted on the downlink and the number of reply packets normally transmitted on the downlink counted by the downlink counting means.

  In the present invention, the error rate calculation means extracts the maximum value from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink, It is possible to evaluate the downlink transmission path by calculating the downlink error rate from the total number of reply packets transmitted on the downlink and the number of reply packets normally transmitted on the downlink counted by the downlink counting means. It becomes.

 A transmission path evaluation method according to a second aspect of the present invention is a transmission path evaluation method for evaluating a transmission path of electric field communication for performing data transmission between the first and second information terminals using an electric field transmission medium as a transmission path, In the first information terminal, the step of storing the expected value of the data of the received packet in the first storage means, the step of receiving the packet transmitted from the second information terminal by the receiving means, When the packet data received by the receiving means and the expected value are matched by the counting means, the packet is counted as being normally transmitted on the upstream path, and the upstream packet counting means by the reply packet generating means Adding the number of packets counted by the means to the data of the packet normally transmitted on the upstream path and generating a reply packet; Transmitting the reply packet to the second information terminal, and storing the data of the packet to be transmitted and the total number of packets to be transmitted in the second storage means as the total number of packets to be transmitted on the upstream path in the second information terminal And a step of transmitting and receiving a reply packet by the total number of packets transmitted to and from the first information terminal by the transmission / reception means, and a data of the reply packet received by the transmission / reception means by the downlink counting means And, when the data of the packets to be transmitted are compared and coincide with each other, the return packet is counted as being normally transmitted on the downlink, and the total number of packets transmitted on the uplink and the downlink by the error rate calculation means Based on the number of reply packets successfully transmitted on the route and the number of packets added for each reply packet Characterized by a step of calculating the error rate of at least one transmission path of the uplink or downlink.

  In the step of the error rate calculation means in the transmission path evaluation method, the total number of packets transmitted from the second storage means is read as the total number of packets transmitted on the upstream path, and the number of packets transmitted normally on the upstream path is The maximum value is extracted from the number of packets added for each reply packet normally transmitted on the route, and the upstream route is calculated from the total number of packets transmitted on this upstream route and the number of packets normally transmitted on this upstream route. An error rate is calculated.

  Further, in the step of the error rate calculation means in the transmission path evaluation method, the maximum value is extracted from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink. Then, the error rate of the downstream path is calculated from the total number of reply packets transmitted on the downstream path and the number of reply packets normally transmitted on the downstream path counted by the downstream counting means.

  An information terminal according to a third aspect of the present invention is the first information in a transmission line evaluation system for evaluating a transmission path for electric field communication in which data transmission is performed between the first and second information terminals using the electric field transmission medium as a transmission path. A storage means for storing an expected value of data of a received packet, a receiving means for receiving a packet transmitted from the second information terminal, and data and an expected value of the packet received by the receiving means If the packet counts match, the upstream counting means counts the number of packets as normally transmitted on the upstream path, and the packet count normally transmitted on the upstream path is counted by the upstream counting means. And a reply packet generating means for generating a reply packet in addition to a transmission means and a transmitting means for transmitting the reply packet to the second information terminal.

  In the present invention, the number of packets normally transmitted on the uplink path is counted by the uplink counting means, and the packet number is added to the reply packet by the reply packet generating means and transmitted to the second information terminal on the downlink path. By doing so, the number of reply packets normally transmitted on the downlink in the second information terminal is counted, the number of packets transmitted on the uplink, the number of reply packets normally transmitted on the downlink, and this reply Based on the number of packets added for each packet, the error rate of at least one of the upstream and downstream transmission paths is calculated, and the transmission paths of the upstream and downstream paths can be evaluated.

  An information terminal according to a fourth aspect of the present invention is a second information terminal that evaluates a transmission path of electric field communication for performing data transmission between the first and second information terminals using an electric field transmission medium as a transmission path, The packet is transmitted as much as the total number of transmission packets between the storage means for storing the data of the packet to be transmitted and the total number of packets to be transmitted as the total number of packets to be transmitted on the upstream path, and the first information terminal, and then returned. Transmission / reception means for receiving the packet and downlink counting means for counting the return packet as having been normally transmitted in the downstream path when the data of the return packet received by the transmission / reception means matches the data of the packet to be transmitted And based on the total number of packets transmitted on the upstream route, the number of reply packets normally transmitted on the downstream route, and the number of packets added for each reply packet, Ri or characterized by comprising an error rate calculating means for calculating the error rate of at least one transmission path of the downlink.

  The error rate calculation means in the information terminal reads the total number of packets to be transmitted from the second storage means as the total number of packets transmitted on the upstream path, and is normal on the downstream path as the number of packets normally transmitted on the upstream path. The maximum value is extracted from the number of packets added for each reply packet transmitted to the network, and the error rate of the upstream route is calculated from the total number of packets transmitted on this upstream route and the number of packets transmitted normally on this upstream route. It is characterized by calculating.

  Further, the error rate calculation means in the information terminal extracts the maximum value from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink, The error rate of the downlink is calculated from the total number of reply packets transmitted on the downlink and the number of reply packets normally transmitted on the downlink counted by the downlink counting means.

  According to the present invention, it is possible to evaluate each uplink and downlink transmission path in electric field communication using an electric field transmission medium such as a human body as a transmission path.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram showing a configuration of a transmission path evaluation system according to the present embodiment. As shown in the figure, a transmission line evaluation system 1 includes a portable information terminal 3 as a first information terminal that is attached to a human arm via a transceiver, for example, and a second information terminal connected to a transceiver installed on the floor. It is comprised by the data collection device 4 as an information terminal.

  Here, the packet transmitted from the data collection device 4 in the upstream route is sent back as a return packet via the portable information terminal 3 using the human body 2 as the electric field transmission medium as the transmission path, and the reply packet received by the data collection device 4 To evaluate the transmission path. Here, the uplink path refers to a packet transmission path from the data collection device 4 to the portable information terminal 3, and the downlink path refers to a packet transmission path from the portable information terminal 3 to the data collection device.

 Next, the configuration of the portable information terminal 3 will be described with reference to FIG. As shown in the figure, the portable information terminal 3 includes a transceiver 5 a, a memory 8, a storage unit 9, an uplink counting unit 10, and a reply packet generation unit 11.

  The transceiver 5a functions as a reception unit that receives a packet transmitted from the transceiver 5b of the data collection device 4, and also functions as a transmission unit that transmits a return packet to the transceiver 5b.

 The memory 8 temporarily stores data of received packets received by the transceiver 5a.

  The storage unit 9 stores the expected value of the received packet data and the number of packets normally transmitted on the uplink as counter values. Here, for example, it is assumed that the expected value of the packet data is set in advance before the evaluation test.

  The uplink counting unit 10 compares the packet data received by the transceiver 5a with the expected value, and counts the packet as having been normally transmitted through the uplink path when they match. Here, the received packet data is read from the memory 8 and the expected value of the packet data is read from the storage unit 9. The counted number of packets is temporarily stored in a memory (not shown) and then written in the counter value of the storage unit 9, and the received packet data is output to the reply packet generation unit 11.

  The reply packet generation unit 11 generates a reply packet by adding the number of packets counted by the uplink counting unit 10 to the data of the packet normally transmitted through the uplink route. Here, the received packet data input from the uplink counting unit 10 is used as the reply packet data, and the number of packets written in the counter value is read from the storage unit 9 and transmitted to the packet ID of the footer unit of the reply packet. A reply packet is generated by adding it together with address information such as the destination and source. The generated reply packet is temporarily stored in a memory (not shown) and then output to the transceiver 5a.

  The memory 8, the storage unit 9, the uplink counting unit 10, and the reply packet generation unit 11 include elements such as a control device, a calculation device, an input device, an output device, and a storage device, and execute various processes according to a program. It is realized by a computer 7 capable of

  Next, the configuration of the data collection device will be described with reference to FIG. As shown in the figure, the data collection device 4 is provided outside via a transceiver 5b installed on the floor and a cable connected to the transceiver 5b, and includes a memory 12, a storage unit 13, a downlink counting unit 14, an error rate. It is comprised with the calculation part 15 and the personal computer 6 provided with the packet transmission part 16. FIG.

  The storage unit 13 stores the data of the packet to be transmitted and the number of transmitted packets as the total number of packets transmitted on the uplink path. Here, at the start of the evaluation test, for example, the data of the packet to be transmitted and the number of transmitted packets are set.

 The transceiver 5b functions as transmission / reception means for transmitting packets for the total number of packets transmitted to the portable information terminal 3 and receiving reply packets.

  The memory 12 temporarily stores the reply packet received by the transceiver 5b.

  The packet transmitter 16 outputs transmission packets to the transceiver 5b by the number of packets to be transmitted. Here, when the evaluation test is started, the data of the packet to be transmitted and the number of transmission packets are read from the storage unit 13, and the transmission packet is output to the transceiver 5b by the number of packets to be transmitted.

  The downlink counting unit 14 compares the data of the reply packet received by the transceiver 5b with the data of the packet to be transmitted and counts the reply packet as having been normally transmitted on the downlink. Here, the data of the reply packet received from the memory 12 is read out, and the data of the packet transmitted from the storage unit 13 is read out. When both are compared and matched, the reply packet is normally transmitted on the downstream path. And the counted value is temporarily stored in a memory (not shown).

  Based on the total number of packets transmitted on the upstream path, the number of reply packets normally transmitted on the downstream path, and the number of packets added for each reply packet, the error rate calculation unit 15 The error rate of one transmission path is calculated. Here, the total number of packets transmitted on the upstream path is read from the storage unit 13 and the number of reply packets normally transmitted on the downstream path counted by the downlink counter 14 and the number of packets added for each reply packet are used. To calculate the transmission path error rate.

  Here, the personal computer 6 including the memory 12, the storage unit 13, the downlink counting unit 14, the error rate calculation unit 15, and the packet transmission unit 16 includes elements such as a control device, an arithmetic device, an input device, an output device, and a storage device. It is realized by executing various processes according to a program.

  Next, a specific configuration inside the transceiver included in the portable information terminal and the data collection device will be described with reference to FIG. The transceiver 5 shown in the figure transmits and receives packets using an optical electric field sensor that induces an electric field based on information to be transmitted in the electric field transmission medium and detects the induced electric field.

  At the time of reception, the transceiver 5 detects the electric field induced and transmitted to the human body 2 with the transmission / reception electrode 18 covered with the dielectric film 17, and couples the electric field to the electric field detection optical unit 501 to generate an electric signal. It is supposed to convert. This electric signal is subjected to signal processing such as amplification and noise removal by the signal processing circuit 502, and further waveform shaping by the waveform shaping circuit 503, and then the computer 7 via the input / output (I / O) circuit 504. Is output.

  When the transceiver 5 receives transmission data from the computer 7 via the input / output (I / O) circuit 504 at the time of transmission, the transceiver 5 supplies the transmission data to the transmission / reception electrode 18 via the transmission unit 505. An electric field is induced in the human body 2 via the transmission / reception electrode 18 and the dielectric film 17, and this electric field is transmitted.

 Next, the transmission path evaluation process performed by the transmission path evaluation system 1 will be specifically described with reference to the drawings. First, a packet used for data transmission between the portable information terminal 3 and the data collection device 4 has a data structure as shown in FIG. 5, and is composed of a data body and a packet ID.

 The data stored in the data body is used for comparison with the expected value of data in the uplink counting unit 10 of the portable information terminal 3 and the downlink counting unit 14 of the data collection device 4.

 The packet ID is located in the footer portion of the packet, and stores the number of packets normally transmitted on the upstream path together with address information such as a transmission destination and a transmission source. Immediately after the start of the test, for example, a NULL code is inserted in the field indicating the number of packets in the packet ID of the packet transmitted from the data collection device 4 to the portable information terminal 3.

 Next, the process of the portable information terminal 3 will be specifically described with reference to the flowchart of FIG.

 Step 1: The expected value of the received packet data is stored in the storage unit 9 in advance. When the test is started, a counter value indicating the number of normally transmitted packets stored in the storage unit 9 is initialized to zero.

 Step 2: The packet transmitted from the data collection device 4 is received by the transceiver 5a.

  Step 3: The uplink counting unit 10 compares the packet data received by the transceiver 5a with the expected value and counts the packet as having been normally transmitted on the uplink path when they match. Here, the received packet data is read from the memory 8 and the expected value of the packet data is read from the storage unit 9. If the two match, the counter value of the storage unit 9 is incremented to match. If not, discard the data.

  Step 4: The reply packet generation unit 11 adds the number of packets counted by the uplink counting unit 10 to the data of the packet normally transmitted on the uplink route, and generates a reply packet. Here, the received packet data input from the uplink counting unit 10 is used as the reply packet data, and the number of packets written in the counter value is read from the storage unit 9 and transmitted to the packet ID of the footer unit of the reply packet. A reply packet is generated by adding it together with address information such as the destination and source.

 Step 5: A reply packet is transmitted to the data collection device 4 by the transceiver 5a.

 Next, the processing of the data collection device 4 will be specifically described with reference to the flowchart of FIG.

 Step 1: At the start of the evaluation test, the data of the packet to be transmitted and the number of transmitted packets are stored in the storage unit 13 as the total number of packets to be transmitted on the upstream path. Here, for example, the total number n of packets transmitted on the upstream route is 100. Here, the value of the counter counted by the down counter 14 is reset to zero.

 Step 2: The transceiver 5b transmits packets for the total number of packets to be transmitted to the portable information terminal 3. Here, the packet transmission unit 16 reads data of n = 100 packets from the storage unit 13, and outputs the transmission packet to the transceiver 5b.

 The packet is transmitted on the upstream path using the human body as a transmission path, and the reply packet generated by the portable information terminal 3 is transmitted on the downstream path.

 Step 3: The reply packet from the transceiver 5a of the portable information terminal 3 is received by the transceiver 5b. The received reply packet is stored in the memory 12.

 Step 4: The down counter 14 compares the data of the reply packet received by the transceiver 5b with the data of the packet to be transmitted, and counts the reply packet as being normally transmitted on the down path when they match. Here, the data of the reply packet received from the memory 12 is read out, and the data of the packet transmitted from the storage unit 13 is read out. When both are compared and matched, the reply packet is normally transmitted on the downstream path. The counter value is incremented as follows. If they do not match, the reply packet is discarded and the next reply packet is compared.

 In this way, all the reply packets received are compared and the counter value is updated. As a result, the total number k of reply packets normally transmitted in the downstream path is, for example, k = 80.

 Step 5: Based on the total number n of packets transmitted on the upstream path, the number of reply packets k transmitted normally on the downstream path, and the number of packets added to each reply packet by the error rate calculation unit 15, The error rate of the downstream transmission path is calculated.

First, calculation of the error rate ER _UP of the uplink route will be described. The total number n of packets to be transmitted n = 100 is read from the storage unit 13 as the total number n of packets transmitted on the upstream route, and is normally transmitted on the downstream route in step 4 as the number of packets m normally transmitted on the upstream route. The maximum value is extracted from the count value of the packet ID added for each reply packet. Here, for example, the maximum value of the packet ID count value is m = 90.

Therefore, the error rate ER _UP (%) of the uplink route is expressed by the following equation (1) from the total number n of packets transmitted on the uplink route and the number m of normally transmitted packets.

ER _UP = ((n−m) / n) × 100 (1)
Next, calculation of the error rate ER _DOWN of the downlink will be described. As the total number j of reply packets transmitted on the downstream path, the maximum value j = 90 is extracted from the count value of the packet ID added for each reply packet normally transmitted on the downstream path in step 4. Accordingly, the error rate ER _DOWN (%) of the downlink is calculated from the following equation (2) from the total number j of reply packets transmitted on the downlink and the number k of reply packets normally transmitted on the downlink counted by the downlink counter. ).

ER _DOWN = ((j−k) / j) × 100 (2)
By calculating the equations (1) and (2), the error rate ER _UP of the uplink route and the error rate ER _{DOWN of the} downlink route are calculated. When the equations (1) and (2) are calculated in the above example, the uplink error rate ER _UP is 10%, and the downlink error rate ER _DOWN is 11%. Is possible.

  Therefore, according to this embodiment, the number of packets normally transmitted on the uplink path is counted by the uplink counting unit 10 included in the portable information terminal 3, and the count value is added to the reply packet by the reply packet generating unit 11. On the other hand, while transmitting to the data collection device 4 through the downlink, the downlink counting unit 14 included in the data collection device 4 counts the number of reply packets normally transmitted through the downlink, and the error rate calculation unit 15 transmits the packet along the uplink. Based on the total number of packets to be transmitted, the number of reply packets normally transmitted on the downlink path, and the count value added to each reply packet, the error rates of the uplink and downlink paths can be calculated.

  This makes it possible to evaluate each of the upstream and downstream transmission paths in electric field communication using an electric field transmission medium such as a human body as the transmission path.

In addition, according to the present embodiment, the error rate calculation unit 15 reads out the total number 100 of packets to be transmitted from the storage unit 13 as the total number n of packets transmitted on the uplink route, and also transmits packets normally transmitted on the uplink route. As the number m, by extracting the maximum value from the count value of the packet ID added for each reply packet normally transmitted in the downlink in step 4, the total number n of packets transmitted in the uplink is normal The error rate ER _UP (%) of the upstream path can be calculated from the number m of packets transmitted to the network.

On the other hand, by extracting the maximum value 90 from the count value of the packet ID added for each reply packet normally transmitted in the downlink in step 4, as the total number j of the reply packets transmitted in the downlink, The error rate ER _DOWN (%) of the downstream path can be calculated from the total number j of reply packets transmitted on the downstream path and the number of reply packets normally transmitted on the downstream path counted by the downstream counting means.

  In the present embodiment, both the upstream and downstream transmission paths are calculated by the error rate calculation unit 15, but only one of the transmission paths may be calculated as necessary.

  In the above embodiment, the data collection device as the second information terminal uses a personal computer as the computer connected to the transceiver installed on the floor, and the portable information as the first information terminal. Although communication is performed with the terminal via the human body, the present invention is not limited to this. For example, the second information terminal also uses a portable information terminal, and is attached to the human body and connected to the first information terminal. May be configured to communicate with each other.

  In the above embodiment, transmission path evaluation of electric field communication was performed when a human body was used as a transmission path as an electric field transmission medium. However, the present invention is not limited to this, and not only the human body but also metals, dielectrics, etc. The present invention may be applied to transmission line evaluation of electric field communication using the electric field transmission medium as a transmission line.

It is explanatory drawing which shows the structure of the transmission-line evaluation system which concerns on this Embodiment. It is a block diagram which shows the schematic structure of the portable information terminal of FIG. It is a block diagram which shows the schematic structure of the data collection device of FIG. It is a block diagram inside the transceiver with which the portable information terminal and data collection device in a transmission-path evaluation system are each provided. It is explanatory drawing which shows the data structure of the packet used in a transmission-line evaluation system. It is a flowchart which shows the process of the portable information terminal in a transmission-path evaluation system. It is a flowchart which shows the process of the data collection device in a transmission-line evaluation system. It is explanatory drawing which shows the example in the case of attaching a portable information terminal to a person via a transceiver and performing electric field communication. It is a block diagram which shows schematic structure of the portable information terminal for the conventional transmission-line evaluation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Transmission path evaluation system 2 ... Human body 3 ... Portable information terminal 4 ... Data collection device 5, 5a, 5b ... Transceiver 6 ... Personal computer 7 ... Computer 8 ... Memory 9 ... Memory | storage part 10 ... Uplink counting part 11 ... Reply packet generation part DESCRIPTION OF SYMBOLS 12 ... Memory 13 ... Memory | storage part 14 ... Down-counting part 15 ... Error rate calculation part 16 ... Packet transmission part 17 ... Dielectric film 18 ... Transmission / reception electrode 100 ... Portable information terminal 101 ... Packet processing apparatus 501 ... Electric field detection optical part 502 ... Signal processing circuit 503... Waveform shaping circuit 504... Input / output (I / O) circuit 505.

Claims (10)

A transmission path evaluation system that evaluates a transmission path of electric field communication for performing data transmission between the first and second information terminals using an electric field transmission medium as a transmission path,
The first information terminal comprises a first storage means for storing an expected value of data of a received packet;
Receiving means for receiving a packet transmitted from the second information terminal;
When the packet data received by the receiving means and the expected value are compared and matched, the uplink counting means that counts the packet as being normally transmitted on the uplink path;
A reply packet generating means for generating a reply packet by adding the number of packets counted by the uplink counting means to data of a packet normally transmitted on the uplink path;
Transmission means for transmitting the reply packet to the second information terminal,
The second information terminal stores the data of the packet to be transmitted and the total number of packets to be transmitted as the total number of packets to be transmitted in the uplink path;
Transmission / reception means for transmitting a packet by the total number of packets to be transmitted to and from the first information terminal and receiving a reply packet;
Downlink counting means for counting the reply packet as being normally transmitted on the downlink when the data of the reply packet received by the transmission / reception means and the data of the packet to be transmitted match and match,
Based on the total number of packets transmitted on the uplink path, the number of reply packets normally transmitted on the downlink path, and the number of packets added for each reply packet, the transmission path of at least one of the uplink and downlink An transmission rate evaluation system comprising: an error rate calculation means for calculating an error rate. The error rate calculation means reads the total number of packets transmitted from the second storage means as the total number of packets transmitted on the upstream path, and transmits normally on the downstream path as the number of packets normally transmitted on the upstream path. The maximum value is extracted from the number of packets added for each returned reply packet,
The transmission path evaluation system according to claim 1, wherein an error rate of the uplink path is calculated from the total number of packets transmitted through the uplink path and the number of packets normally transmitted through the uplink path. The error rate calculation means extracts the maximum value from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink,
The downlink path error rate is calculated from the total number of reply packets transmitted on the downlink path and the number of reply packets normally transmitted on the downlink path counted by the downlink counting means. The transmission line evaluation system described. A transmission path evaluation method for evaluating a transmission path of electric field communication for performing data transmission between the first and second information terminals using an electric field transmission medium as a transmission path,
Storing the expected value of the data of the received packet in the first storage means in the first information terminal;
Receiving a packet transmitted from the second information terminal by a receiving means;
When the packet data received by the receiving unit and the expected value are compared by the uplink counting unit, the packet is counted as having been normally transmitted on the upstream path when they match.
A step of generating a reply packet by adding the number of packets counted by the uplink counting means to the data of the packet normally transmitted on the uplink path by a reply packet generating means;
Transmitting the reply packet to the second information terminal by a transmitting means,
In the second information terminal, storing the data of the packet to be transmitted and the total number of packets to be transmitted in the second storage means as the total number of packets to be transmitted in the uplink path;
Transmitting / receiving packets by the total number of packets to be transmitted to / from the first information terminal by a transmitting / receiving means, and receiving a reply packet;
A step of counting the reply packet as being normally transmitted in the downlink path when the packet of the reply packet received by the transceiver means and the data of the packet to be transmitted are matched by the downlink counting means;
Based on the total number of packets transmitted on the uplink route, the number of reply packets normally transmitted on the downlink route, and the number of packets added for each reply packet, the error rate calculation means And a step of calculating an error rate of at least one of the transmission paths. In the step by the error rate calculating means, the total number of packets transmitted from the second storage means is read as the total number of packets transmitted on the upstream path, and the number of packets normally transmitted on the upstream path is normal on the downstream path The maximum value is extracted from the number of packets added for each reply packet transmitted to
5. The transmission path evaluation method according to claim 4, wherein an error rate of the uplink path is calculated from the total number of packets transmitted through the uplink path and the number of packets normally transmitted through the uplink path. In the step by the error rate calculating means, the maximum value is extracted from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink.
6. The downlink path error rate is calculated from the total number of reply packets transmitted on the downlink path and the number of reply packets normally transmitted on the downlink path counted by the downlink counting means. The transmission path evaluation method described. A first information terminal in a transmission path evaluation system that evaluates a transmission path of electric field communication for performing data transmission between the first and second information terminals using the electric field transmission medium as a transmission path;
Storage means for storing the expected value of the received packet data;
Receiving means for receiving a packet transmitted from the second information terminal;
When the packet data received by the receiving means and the expected value are compared and matched, the uplink counting means for counting the number of packets as being normally transmitted on the uplink path;
A reply packet generating means for generating a reply packet by adding the number of packets counted by the uplink counting means to data of a packet normally transmitted on the uplink path;
An information terminal comprising: transmission means for transmitting the reply packet to the second information terminal. A second information terminal that evaluates a transmission path for electric field communication that performs data transmission between the first and second information terminals using the electric field transmission medium as a transmission path;
Storage means for storing the packet data to be transmitted and the total number of packets to be transmitted as the total number of packets to be transmitted on the upstream path;
Transmission / reception means for transmitting a packet for the total number of transmission packets with the first information terminal and receiving a reply packet;
Downlink counting means for counting the reply packet as being normally transmitted on the downlink when the data of the reply packet received by the transmission / reception means and the data of the packet to be transmitted match and match,
Based on the total number of packets transmitted on the uplink path, the number of reply packets normally transmitted on the downlink path, and the number of packets added for each reply packet, the transmission path of at least one of the uplink and downlink An information terminal comprising an error rate calculation means for calculating an error rate. The error rate calculation means reads the total number of packets transmitted from the second storage means as the total number of packets transmitted on the upstream path, and transmits normally on the downstream path as the number of packets normally transmitted on the upstream path. The maximum value is extracted from the number of packets added for each returned reply packet,
9. The information terminal according to claim 8, wherein the error rate of the uplink route is calculated from the total number of packets transmitted through the uplink route and the number of packets normally transmitted through the uplink route. The error rate calculation means extracts the maximum value from the number of packets added for each reply packet normally transmitted on the downlink as the total number of reply packets transmitted on the downlink,
10. The downlink path error rate is calculated from the total number of reply packets transmitted on the downlink path and the number of reply packets normally transmitted on the downlink path counted by the downlink counting means. The described information terminal.

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