JP2006109301A - Transmitter and receiver, and wireless system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless transmitter and wireless receiver, and a wireless system, in which probability to omit, in transmission, data with high significance, such as emergency contact can be suppressed or a correction rate can be improved on a receiving side by switching, in accordance with significance of data to be transmitted, a transmission rate in transmission on a transmitter side, the number of times of transmitting the data, or the quantity of parities to be added for error correction. <P>SOLUTION: This wireless system includes: a transmitter comprised of a data acknowledgement unit for acknowledging transmission data, a transmission rate switching unit for switching the transmission rate in transmission in accordance with a data significance flag from the data acknowledgement unit and a transmitter antenna for wireless data outputting; and a receiver comprised of a data receiving unit for separating received data into a header and data, and a means for accumulating the separated data in a buffer and outputting them to the outside. Thus, the transmission rate in transmission is switched in accordance with data, thereby transmitting data with high significance, such as emergency contact in an aircraft while suppressing probability to omit such data in transmission. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless transmission device, a wireless reception device, and a wireless system thereof capable of reliably transmitting and receiving highly important information such as emergency communication in an aircraft in a communication system such as an aircraft. It is.

  Conventionally, in the mobile communication field such as a mobile phone, as a high-speed IMT-2000 packet transmission system (for example, as shown in the conventional example of Patent Document 1), the peak transmission speed of the downlink is increased. A method called HSDPA (High Speed Downlink Packet Access) for the purpose of low transmission delay and high throughput has been studied.

  As a technology for configuring HSDPA, 3GPP (3rd Generation Partnership Project) TR25.848 “Physical layer aspects of UTRA High Speed Downlink Packet Access” is referred to as AMC (Ad Coded Amplification). Is disclosed.

  This AMC technique is a technique for adaptively and rapidly changing adaptive modulation parameters such as the number of modulation levels and the error correction coding rate in accordance with fluctuations in channel quality. In the AMC technique, the higher the channel quality, the higher the transmission rate by using a larger modulation multi-level number and coding rate. Specifically, the mobile station (receiver) measures the downlink propagation path environment at any time, and notifies the base station of an adaptive modulation request CQI (Channel Quality Indicator) based on this measurement result. This CQI value corresponds to a set of adaptive modulation parameters. Based on this CQI, the base station determines a mobile device to which transmission data is to be transmitted and an optimal adaptive modulation parameter, and transmits the transmission data.

  On the other hand, when video or audio or data is transmitted or received via wireless transmission, IEEE. Devices defined in 802.11a / b / g are used.

IEEE. In 802.11a / b / g, similarly to mobile communications such as mobile phones, the radio wave status of the mobile device (receiving device) is fed back to the base station (transmitting device), and the transmission side modulation is performed according to the result. The technique of changing the method is used as link adaptation.
JP 2004-180154 A

  However, in the conventional apparatus, even if adaptive modulation is performed in consideration of the radio wave condition on the receiving apparatus side as described above, the adaptive modulation parameter is uniformly determined based on the propagation path environment. When transmitting data, there is a problem that the adaptive modulation parameter is not always corrected.

  In general, the radio wave condition is changing every moment, and it is highly possible that the radio wave condition is greatly different even immediately after feedback from the receiving side, and it is not always effective even when the adaptive modulation parameter is corrected. Had.

  Furthermore, when the data transmission from the transmission device is multicast transmission, there is no mechanism for transmitting information on the radio wave condition such as CQI from the reception side to the transmission side, and thus there is a problem that the parameter cannot be changed by the conventional feedback method. It was.

  In general, when data transmission from a transmission device is multicast transmission, there is no mechanism for requesting retransmission of lost packets on the transmission path from the reception side to the transmission side. There is no way to do it.

  As a countermeasure, when trying to reduce transmission errors during wireless transmission, the transmission rate is lowered, so that the transmission efficiency becomes very poor. On the other hand, when the transmission rate is lowered uniformly, the transmission band is narrowed for providing video and audio services, and the transmission band cannot be effectively used, and the service is limited.

  The present invention has been made in view of the above points, and according to the importance of data to be transmitted, the transmission speed at the time of transmission on the transmission device side, the number of times of data transmission, or the amount of parity added for error correction To provide a wireless transmission device, a wireless reception device, and a wireless system that can suppress the probability that data with high importance such as emergency contact will be lost during transmission, or can increase the correction rate on the reception side For the purpose.

In order to solve the above problem, a first wireless system of the present invention is provided in a wireless area.
A data confirmation unit for confirming transmission data, a data input from the data confirmation unit, a transmission rate switching unit for switching a transmission rate at the time of transmission according to the importance of the data, and data from the transmission rate switching unit by wireless A transmitting antenna for outputting, a receiving antenna for receiving data from the transmitting antenna, a data receiving unit for separating data from the receiving antenna into a header and data, and separated data And a means for storing the data in a buffer and outputting the same to the outside.

  With this configuration, by switching the transmission speed according to the transmission data, it is possible to suppress the probability that data with high importance such as emergency contact in an aircraft or the like is lost during transmission.

The second wireless system according to the present invention includes a data confirmation unit for confirming transmission data, data received from the data confirmation unit in a wireless area, and the number of data transmissions during transmission according to the importance of the data. A data transmission frequency switching unit for switching, a transmission antenna for wirelessly outputting data from the data transmission frequency switching unit, and a reception antenna for receiving data from the transmission antenna, A receiving device comprising: a data separating unit that separates data from the receiving antenna into a header and data and rearranges the data order; and a means for storing the rearranged data in a buffer and outputting the data to the outside. It is characterized by being configured.

  With this configuration, high-priority data such as emergency contact in an aircraft has been lost during transmission by distributing the data so that the same number of times the data is repeatedly transmitted according to the transmission data is not continuously transmitted. In this case, the correction rate on the receiving side can be increased without re-transmission.

  The third wireless system of the present invention receives a data confirmation unit for confirming transmission data and data from the data confirmation unit in a wireless area, and adds the data to the data at the time of transmission according to the importance of the data. An error correction addition processing unit that switches redundancy of error correction; a wireless transmission antenna for wirelessly outputting data from the error correction addition processing unit; and a data transmission from the transmission antenna. A receiving apparatus comprising: a receiving antenna for receiving; an error correcting unit that performs error correction of missing data using data from the receiving antenna; and means for storing data after error correction in a buffer and outputting the data to the outside It is comprised by these.

  With this configuration, by changing the redundancy of error correction added to the data according to the transmission data, high-priority data such as emergency contact in an aircraft etc. is received without being retransmitted when it is lost during transmission It is possible to increase the correction rate on the side.

  As described above, according to the wireless transmission device, the wireless reception device, and the wireless system of the present invention, it is possible to suppress the probability of loss during transmission by switching the transmission rate according to highly important data such as emergency contact. An excellent effect is obtained.

  In addition, according to the wireless transmission device, the wireless reception device, and the wireless system of the present invention, the number of times data is repeatedly transmitted is changed according to highly important data such as emergency contact, and the same data is not continuously transmitted. Dispersing the signals in the above manner provides an excellent effect that when a loss occurs during transmission, the correction rate on the receiving side can be increased without re-transmission.

  Furthermore, according to the wireless transmission device and the wireless reception device and the wireless system of the present invention, when lost during transmission by changing the redundancy of error correction to be added to the data according to highly important data such as emergency contact, An excellent effect is obtained in that the correction rate on the receiving side can be increased without re-transmission.

  Further, according to the present invention, in a transmission method that does not transmit information on the radio wave condition such as CQI from the receiving side and does not request retransmission of missing data as in the wireless multicast transmission method, the present invention can be applied to highly important data such as emergency contact. Accordingly, by changing the parameters at the time of transmission, it is possible to obtain an excellent effect that loss packets on the transmission path can be reduced or the correction rate on the receiving side can be increased.

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

(Embodiment 1)
FIG. 1 is a configuration diagram of a wireless transmission device, a wireless reception device, and a wireless system in the present application. In FIG. 1, reference numeral 100 denotes a person who provides a service, and in this embodiment, an example of a crew member in an airplane or the like is used. Reference numeral 101 denotes a device for inputting Passenger Announcement (hereinafter referred to as PA), which is a PA input unit for reproducing video and audio such as a hand microphone, a wireless microphone, or a VTR in the present embodiment. Reference numeral 102 denotes a device that accumulates video, audio, games, or the like, or converts it into a predetermined format, and is a server in this embodiment. Reference numeral 103 denotes a device that transmits an entertainment environment such as an AV service or a game and emergency communication to passengers in the aircraft, and is a transmission device in the present embodiment. Reference numeral 104 denotes a function in the transmission apparatus, and in this embodiment, a data confirmation unit that confirms input data from the server. Reference numeral 105 denotes a function in the transmission apparatus. In this embodiment, a transmission rate switching unit that switches a wireless transmission rate in accordance with data and parameters from the data confirmation unit.

  Reference numeral 106 denotes a function in the transmission apparatus. In the present embodiment, the transmission antenna unit 106 transmits the output from the transmission rate switching unit to the outside. Reference numeral 107 denotes a function in the receiving apparatus. In this embodiment, the receiving antenna unit 107 receives data from the transmitting apparatus.

  Reference numeral 108 denotes a device that receives data from the transmission device and outputs the data to the outside. In this embodiment, the reception device 108 is used. Reference numeral 109 denotes a function in the receiving apparatus, which is a data receiving unit that separates received data into a header and data. Reference numeral 110 denotes a device that outputs sound to the outside of the receiving apparatus, and in the present embodiment, is a headphone or a speaker. Reference numeral 111 denotes a device that outputs an image to the outside of the receiving apparatus, and is a projector or a monitor in this embodiment.

  The wireless transmission device, wireless reception device, and wireless system of the present invention will be described with reference to FIG.

  Normally, passengers enjoy entertainment such as AV services and games such as audio and video from the server 102 using headphones 110 and a monitor 111 via a wireless transmission path.

  However, if there is a risk that the aircraft will fluctuate greatly due to airflow during the flight, the crew member 100 will send a hand from the PA input unit 101 to the server 102 in order to prompt the passenger to sit on the seat or attach the seat belt. An interrupt command is transmitted by a power source such as a microphone or a SW, and emergency communication is started.

  Upon receiving the interrupt command and emergency contact data (for example, information such as video and audio), the server 102 immediately divides the interrupt command and the emergency contact data into a predetermined data format (for example, data into a predetermined data size). The data importance level flag is assigned to each divided data), and the data is immediately transmitted to the transmitting apparatus 103.

  In the transmission device 103, the received data is input to the data confirmation unit 104, and the data confirmation unit 104 confirms the importance flag of the data, and generates a parameter for wireless transmission according to the importance. Further, the parameter and data generated by the data confirmation unit 104 are transmitted to the transmission rate switching unit 105. The transmission rate switching unit 105 switches the transmission rate according to the parameters, converts the data into a wireless data format, and transmits the transmission antenna. The data is transmitted to the outside of the transmission device 103 via 106.

  The data reception unit 109 of the reception device 108 that has received the data from the transmission antenna 106 via the reception antenna 107 decodes the data, and does not pass through a buffer (high importance data) depending on the importance. Preferentially, the signal is output to the headphone 110 and the monitor 111, which are the output destinations of the receiving device 108, for the passenger.

  Next, the operation of the transmitting apparatus 103 will be described in detail with reference to FIGS.

  FIG. 4 is a configuration diagram of the data confirmation unit 104 of the transmission device 103 in the present application. In FIG. 4, reference numeral 401 denotes a data reception buffer for receiving audio / video viewing data, emergency communication, and the like from the server 102. A data analysis unit 402 analyzes the importance of data from the data reception buffer 401. Reference numeral 403 denotes a parameter generation unit that generates a parameter at the time of transmission by referring to an internal parameter table in accordance with the result of the data analysis unit.

  FIG. 5 is an example of a parameter table in the present application. In FIG. 5, the contents of the service are classified in advance according to the importance, and each parameter is referred to according to the importance.

  Usually, a passenger receives entertainment content from the server 102 from the transmission device 103 via a wireless path, and enjoys audio and video viewing data or a game using the headphones 110 and the monitor 111. Data processing in this case will be described.

  The data reception buffer 401 buffers data (entertainment content) from the server 102 and transmits it to the data analysis unit 402 at regular intervals. The data analysis unit 402 that has received the data analyzes the data that has been converted into a predetermined data format in advance, detects the importance flag in the data, and the result of the importance flag (entertainment content = The importance 4) is transmitted to the parameter generator 403.

  The parameter generation unit 403 generates necessary parameters with reference to the parameter table of FIG. Since the importance flag is “4” this time, the parameter in the “4” column of importance is referred to.

  That is, in this case, the parameter generation unit 403 transmits transmission parameters such as “48 Mbps” as the transmission rate, “64-QAM” as the modulation scheme, and “2/3” as the coding rate.

  The data confirmation unit 104 transmits the generated parameters and data to the transmission rate switching unit 105. The transmission rate switching unit 105 sets the transmission rate, modulation method, and coding rate according to the received parameters, converts the input data into the set transmission format, and uses the data modulated by the transmission antenna 106. Output to the outside of the transmitter 103.

  As described above, since the importance level of entertainment / content data is lower than that of emergency contact, a parameter that can acquire as much transmission band as possible is set as a service form.

  On the other hand, data processing when an emergency call occurs while a passenger enjoys viewing data or a game will be described.

  The data reception buffer 401 buffers data (video or audio for emergency contact use) from the server 102 and transmits it to the data analysis unit 402 at regular intervals. The data analysis unit 402 that has received the data analyzes the data that has been converted into a predetermined data format in advance, detects the importance flag in the data, and the result of the importance flag (emergency broadcast = important Degree 1) is transmitted to the parameter generation unit 403.

  The parameter generation unit 403 generates necessary parameters with reference to the parameter table of FIG. Since the importance flag is “1” this time, the parameter in the “1” column of importance is referred to.

  That is, in this case, the transmission parameter such as “6 Mbps” as the transmission rate, “BPSK” as the modulation scheme, and “1/2” as the coding rate is transmitted from the parameter generation unit 403. The data confirmation unit 104 transmits the generated parameters and data to the transmission rate switching unit 105. The transmission rate switching unit 105 sets the transmission rate, modulation method, and coding rate according to the received parameters, converts the input data into the set transmission format, and uses the data modulated by the transmission antenna 106. Output to the outside of the transmitter 103.

  As mentioned above, the emergency contact data is the most important, so by setting a parameter that can transmit data more reliably by reducing the transmission speed and making it a more error-resistant transmission method .

  As described above, by generating parameters such as transmission rate, modulation method, and coding rate when transmitting according to the importance of data (service) for wireless transmission, the probability is higher in one transmission and passengers It is possible to deliver emergency contact.

  Also, the effectiveness (real-time property) of parameter correction at the time of transmission, which has been a conventional problem, can be realized by changing the parameters at the time of transmission according to the importance of data (service) for wireless transmission.

  Furthermore, by generating parameters such as the transmission rate, modulation method, and coding rate according to the importance of the data to be transmitted, once there is no feedback or retransmission request of the radio wave condition at the time of multicast transmission, which was a problem of the conventional method, It is possible to deliver emergency contact to passengers with a higher probability of transmission.

  Also, by generating parameters such as transmission rate, modulation method, and coding rate according to the importance of the data to be transmitted, a transmission method that meets the service needs of the data to be transmitted can be realized. Can be used effectively.

  Note that in this embodiment, the use method in an aircraft is described as an example, but the present invention is not limited to an aircraft, and is not limited to an aircraft, but a room such as an audiovisual room, a movie theater, or a train (vehicle), or baseball The same effect can be expected even in outdoor areas where soccer, racing, and racetracks are limited.

  In the present embodiment, the emergency contact of the crew member is performed via a wire. However, the present embodiment is not limited to a wire connection, and the same effect can be expected even when an equivalent emergency contact is transmitted via a wireless connection.

  In this embodiment, the PA input unit is transmitted via the server. However, the present invention is not limited to this, and the same effect can be expected even if the PA input unit is directly input to the transmission device without passing through the server.

  Further, in the present embodiment, explanation is given in the state where the importance flag setting of data and service is set in advance, but setting in advance is not limited to the aircraft company, and information and services that passengers want ( The same effect can be expected even when a mechanism capable of setting the importance level according to importance 1 is implemented.

  In this embodiment, the emergency contact is mainly described as an in-flight announcement by the crew, but the present invention is not limited to the announcement. For example, the same effect can be obtained in the case of data from a VTR such as an escape route or an entry procedure. Can be expected.

  In this embodiment, the transmission rate, modulation method, and coding rate are described as parameters at the time of transmission as an example, but the parameters are not limited to these, and even when any of these is applied The same effect can be expected, and the same effect can be expected even when all parameters that can be set at the time of wireless transmission such as transmission power are taken into account.

  Further, in the present embodiment, as an example, according to the importance of data, parameters at the time of transmission (transmission rate and modulation scheme, coding rate) are fixed values, but are not necessarily limited to fixed values, A similar effect can be expected even when a parameter having a margin more than a preset fixed value (a transmission parameter value with a lower transmission error) is considered and the value is set.

  Further, in the present embodiment, as an example, according to the importance of data, parameters at the time of transmission (transmission rate and modulation scheme, coding rate) are fixed values, but are not necessarily limited to fixed values, In the case of unicast transmission, parameters with more margins are prepared from information on radio wave conditions such as CQI from the receiving side (a parameter table that takes into account the relationship between radio wave conditions and transmission rate, modulation method, coding rate, etc. in advance). The same effect can be expected even if set.

  In this embodiment, as an example, the parameters at the time of transmission (transmission rate, modulation method, coding rate) are changed in conjunction with each other according to the importance of the data. However, the relationship between the parameter values is independent. Are not necessarily linked. However, the maximum value of the transmission rate is determined by the modulation method. For example, in the case of 11a, the transmission rate is assumed to be “54 Mbps” and “48 Mbps” in the case of “64-QAM modulation”, and when the same data is transmitted, the transmission rate of “54 Mbps” is higher in the data rate. Therefore, the probability of transmission error decreases as the probability of dropping due to a radio-specific burst error decreases.

(Embodiment 2)
FIG. 2 is a configuration diagram of a wireless transmission device, a wireless reception device, and a wireless system in the present application. In FIG. 2, reference numeral 100 denotes a person who provides a service, and in this embodiment, an example of a crew member in an airplane or the like is used. Reference numeral 101 denotes a device for inputting Passenger Announcement (hereinafter referred to as PA), which is a PA input unit for reproducing video and audio such as a hand microphone, a wireless microphone, or a VTR in the present embodiment. Reference numeral 102 denotes a device that accumulates video, audio, games, and the like, or converts it into a predetermined format, and is a server in this embodiment. Reference numeral 103 denotes a device that transmits an entertainment environment such as an AV service or a game and emergency communication to passengers in the aircraft, and is a transmission device in the present embodiment. Reference numeral 104 denotes a function in the transmission apparatus, and in this embodiment, a data confirmation unit that confirms input data from the server. 201 is a function in the transmission apparatus. In this embodiment, the same data is repeatedly transmitted according to the data and parameters from the data confirmation unit, and further, the data transmission frequency switching is performed so that the same data is not continuously transmitted. Part. Reference numeral 107 denotes a function in the receiving apparatus. In this embodiment, the receiving antenna unit 107 receives data from the transmitting apparatus.

  Reference numeral 108 denotes a device that receives data from the transmission device and outputs the data to the outside. In this embodiment, the reception device 108 is used. Reference numeral 202 denotes a function in the receiving apparatus, which is a data separating unit that separates received data into a header and data, rearranges the data in the correct order, and transmits the data to the buffer. Reference numeral 110 denotes a device that outputs sound to the outside of the receiving apparatus, and in the present embodiment, is a headphone or a speaker. Reference numeral 111 denotes a device that outputs an image to the outside of the receiving apparatus, and is a projector or a monitor in this embodiment.

  The radio transmission apparatus, radio reception apparatus, and radio system of the present invention will be described with reference to FIG.

  Normally, passengers enjoy entertainment such as AV services and games such as audio and video from the server 102 using headphones 110 and a monitor 111 via a wireless transmission path.

  However, if there is a risk that the aircraft will fluctuate greatly due to airflow during the flight, the crew member 100 will send a hand from the PA input unit 101 to the server 102 in order to prompt the passenger to sit on the seat or attach the seat belt. An interrupt command is transmitted by a power source such as a microphone or a SW, and emergency communication is started.

  Upon receiving the interrupt command and emergency contact data (for example, information such as video and audio), the server 102 immediately divides the interrupt command and the emergency contact data into a predetermined data format (for example, data into a predetermined data size). The data importance level flag is assigned to each divided data), and the data is immediately transmitted to the transmitting apparatus 103.

  In the transmission device 103, the received data is input to the data confirmation unit 104, the importance level flag of the data is confirmed by the data confirmation unit 104, and the number of repetitions of the same data when wirelessly transmitted according to the importance level The dispersion parameter is distributed so that the same data is not continuously transmitted. Further, the parameter and data generated by the data confirmation unit 104 are transmitted to the data transmission frequency switching unit 201. The data transmission frequency switching unit 201 repeatedly transmits the same data at a predetermined interval according to the parameter while distributing the same data at a predetermined interval. Then, the data is converted into a wireless data format and transmitted to the outside of the transmission device 103 via the transmission antenna 106.

  The data separation unit 202 of the reception apparatus 108 that has received the data from the transmission antenna 106 via the reception antenna 107 is the same as the missing data multiplexed in another location when, for example, data is lost in the wireless transmission path. By interpolating the missing data using data and discarding duplicate data, the data is rearranged in the correct data order, depending on its importance (high importance data) without using the buffer it holds Preferentially, the signal is output to the headphone 110 and the monitor 111, which are the output destinations of the receiving device 108, for the passenger.

  However, if there is no data identical to the missing data in another location, the system waits for a predetermined time and transmits the next data after the missing data.

  Next, the operation of the transmitting apparatus 103 will be described in detail with reference to FIGS. 4, 6, and 7. FIG.

  FIG. 4 is a configuration diagram of the data confirmation unit 104 of the transmission device 103 in the present application. In FIG. 4, reference numeral 401 denotes a data reception buffer for receiving audio / video viewing data, emergency communication, and the like from the server 102. A data analysis unit 402 analyzes the importance of data from the data reception buffer 401. Reference numeral 403 denotes a parameter generation unit that generates a parameter at the time of transmission by referring to an internal parameter table in accordance with the result of the data analysis unit.

  FIG. 6 is an example of a parameter table in the present application. In FIG. 6, the contents of the service are classified in advance according to importance, and parameters are referred to according to the importance.

  FIG. 7 is an example when the same data in the present application is repeatedly transmitted a predetermined number of times at predetermined intervals.

  Usually, a passenger receives entertainment content from the server 102 from the transmission device 103 via a wireless path, and enjoys audio and video viewing data or a game using the headphones 110 and the monitor 111. Data processing in this case will be described.

  The data reception buffer 401 buffers data (entertainment content) from the server 102 and transmits it to the data analysis unit 402 at regular intervals. The data analysis unit 402 that has received the data analyzes the data that has been converted into a predetermined data format in advance, detects the importance flag in the data, and the result of the importance flag (entertainment content = The importance 4) is transmitted to the parameter generator 403.

  The parameter generation unit 403 generates necessary parameters with reference to the parameter table of FIG. Since the importance flag is “4” this time, the parameter in the “4” column of importance is referred to. That is, in this case, the parameter generation is performed when the parameter is multiplexed, such as “1” as the number of repetitions of the same data, “1” as the block unit as the unit of data dispersion, and “1” as the data dispersion. Transmitted from the unit 403.

  The data confirmation unit 104 transmits the generated parameters and data to the data transmission number switching unit 201. The data transmission frequency switching unit 201 repeatedly transmits the same data a predetermined number of times according to the received parameter, and after dispersing the same data at a predetermined interval so that the same data is not continuously transmitted, converts it to a predetermined transmission format, The data modulated by the transmission antenna 106 is output to the outside of the transmission device 103.

  Here, a data transmission method of the data transmission number switching unit 201 will be described.

  In the case of the current parameter, as shown in [a] of FIG. 7, since the number of repetitions is “1”, the same data is performed once (no repetition), and since the block unit is “1”, one data unit, data Therefore, only original data is transmitted.

  As described above, since the importance level of entertainment / content data is lower than that of emergency contact, a parameter that can acquire as much transmission band as possible is set as a service form.

  On the other hand, data processing when an emergency call occurs while a passenger enjoys viewing data or a game will be described.

  The data reception buffer 401 buffers data (video or audio for emergency contact use) from the server 102 and transmits it to the data analysis unit 402 at regular intervals. The data analysis unit 402 that has received the data analyzes the data that has been converted into a predetermined data format in advance, detects the importance flag in the data, and the result of the importance flag (emergency broadcast = important Degree 1) is transmitted to the parameter generation unit 403.

  The parameter generation unit 403 generates necessary parameters with reference to the parameter table of FIG. Since the importance flag is “1” this time, the parameter in the “1” column of importance is referred to. That is, in this case, the parameter at the time of transmission such as “10” as the number of repetitions of the same data, “20” as the block unit as the unit of data dispersion, and “100” as the data dispersion is the parameter generation. Transmitted from the unit 403.

  The data confirmation unit 104 transmits the generated parameters and data to the data transmission number switching unit 201. The data transmission frequency switching unit 201 repeatedly transmits the same data a predetermined number of times according to the received parameter, and after dispersing the same data at a predetermined interval so that the same data is not continuously transmitted, converts it to a predetermined transmission format, The data modulated by the transmission antenna 106 is output to the outside of the transmission device 103.

  Here, a data transmission method of the data transmission number switching unit 201 will be described.

  In the case of the current parameter, as shown in FIG. 7B, since the number of repetitions is “10”, after data 1 is repeatedly transmitted 10 times, data 2 is repeatedly transmitted 10 times. This process is repeated up to the data 20 (because the block unit is “20”). The data unit from data 1 to data 20 is the minimum unit A to be distributed, and the data dispersion degree “100” is transmitted 100 times repeatedly.

  In this way, the same data is repeatedly transmitted a predetermined number of times, and the same data is distributed at predetermined intervals so that the same data is not continuously transmitted. Since the number of repetitions is “10”, data can be interpolated even if up to nine identical data are lost. In addition, since the discontinuity is “100” as a continuous omission, interpolation is possible even when a maximum of 10 × 20 × 99 = 19800 data is lost. That is, the data transmission frequency switching unit 201 transmits a data amount 1000 times the maximum normal data in this example.

  As mentioned above, the importance of emergency contact data is the highest, so the transmission band is effectively used without reducing the transmission speed, the same data is repeatedly transmitted multiple times, and the same data is not transmitted continuously. The parameters are set so that the data can be transmitted more reliably by distributing the data to each other.

  As described above, the transmission band and the modulation method are not changed according to the importance of data (service) for wireless transmission, but the transmission band is utilized to the maximum, and the same data is transmitted multiple times according to the data to be transmitted. By repeatedly transmitting and further distributing the data, highly important data can be distributed to passengers with higher probability in one transmission.

  Also, the effectiveness (real-time property) of parameter correction at the time of transmission, which has been a conventional problem, can be realized by changing the parameters at the time of transmission according to the importance of data (service) for wireless transmission.

  Furthermore, by repeatedly transmitting the same data multiple times depending on the importance of the data to be transmitted and further distributing the data, there is no need for feedback of radio wave conditions or retransmission requests during multicast transmission, which was a problem of the conventional method. It is possible to deliver emergency contact to passengers with higher probability with one transmission.

  Note that in this embodiment, the use method in an aircraft is described as an example, but the present invention is not limited to an aircraft, and is not limited to an aircraft, but a room such as an audiovisual room, a movie theater, or a train (vehicle), or baseball The same effect can be expected even in outdoor areas where soccer, racing, and racetracks are limited.

  In the present embodiment, the emergency contact of the crew member is performed via a wire. However, the present embodiment is not limited to a wire connection, and the same effect can be expected even when an equivalent emergency contact is transmitted via a wireless connection.

  Further, in the present embodiment, explanation is given in the state where the importance flag setting of data and service is set in advance, but setting in advance is not limited to the aircraft company, and information and services that passengers want ( The same effect can be expected even when a mechanism capable of setting the importance level according to importance 1 is implemented.

  In this embodiment, the emergency contact is mainly described as an in-flight announcement by the crew, but the present invention is not limited to the announcement. For example, the same effect can be obtained in the case of data from a VTR such as an escape route or entry procedures. Can be expected.

  Further, in this embodiment, as an example, the description is given in terms of the number of repetitions of the same data as the transmission parameter and the block unit, which is a unit to be distributed, and the data distribution degree. However, the parameters are not limited to these. The same effect can be expected when either of the above is applied.

  In the present embodiment, as an example, the parameters at the time of transmission (number of repetitions, block units, and degree of dispersion) are set to fixed values according to the importance of the data. However, the values are not necessarily limited to fixed values. The same effect can be achieved even if the parameter is set in consideration of a parameter that has more margin than the fixed value (a transmission method with a lower transmission error (the number of repetitions and the degree of dispersion is larger)). I can expect.

  In the present embodiment, as an example, parameters at the time of transmission (repetition count and block unit, degree of dispersion) are given according to data, but these values are not limited to the values shown in the example, Even in the case of data with low importance, the same effect can be expected by giving a parameter for repeatedly transmitting the same data. Furthermore, in the case of a transmission method without retransmission such as multicast transmission, more effect can be expected by giving parameters even for data of low importance.

  Also, in this embodiment, as an example, the parameters at the time of transmission (the number of repetitions and the unit of block, and the degree of dispersion) are set to fixed values according to the data, but are not necessarily limited to fixed values, and are not limited to unicast transmission. In this case, a parameter with more margin (a parameter table taking into account the relationship between the radio wave status, the number of repetitions, and the degree of dispersion is prepared in advance) from information on the radio wave status such as CQI from the receiving side and CRC error. The same effect can be expected even when set in consideration.

  Furthermore, the parameter table needs to be designed in consideration of the data size and transmission band to be actually transmitted.

(Embodiment 3)
FIG. 3 is a configuration diagram of a wireless transmission device, a wireless reception device, and a wireless system in the present application. In FIG. 3, reference numeral 100 denotes a person who provides a service, and in the present embodiment, it is an example of a crew member in an airplane or the like. Reference numeral 101 denotes a device for inputting Passenger Announcement (hereinafter referred to as PA), which is a PA input unit for reproducing video and audio such as a hand microphone, a wireless microphone, or a VTR in the present embodiment. Reference numeral 102 denotes a device that accumulates video, audio, games, and the like, or converts it into a predetermined format, and is a server in this embodiment. Reference numeral 103 denotes a device that transmits an entertainment environment such as an AV service or a game and emergency communication to passengers in the aircraft, and is a transmission device in the present embodiment. Reference numeral 104 denotes a function in the transmission apparatus, and in this embodiment, a data confirmation unit that confirms input data from the server. Reference numeral 301 denotes a function in the transmission apparatus. In this embodiment, an error correction addition processing unit that adds error correction according to a predetermined format in accordance with data and parameters from the data confirmation unit. Reference numeral 107 denotes a function in the receiving apparatus. In this embodiment, the receiving antenna unit 107 receives data from the transmitting apparatus.

  Reference numeral 108 denotes a device that receives data from the transmission device and outputs the data to the outside. In this embodiment, the reception device 108 is used. Reference numeral 302 denotes a function in the receiving apparatus, which is an error correction unit that corrects the missing data from the parity data added to the received data. Reference numeral 110 denotes a device that outputs sound to the outside of the receiving apparatus, and in the present embodiment, is a headphone or a speaker. Reference numeral 111 denotes a device that outputs an image to the outside of the receiving apparatus, and is a projector or a monitor in this embodiment.

  The radio transmission apparatus, radio reception apparatus, and radio system of the present invention will be described with reference to FIG.

  Normally, passengers enjoy entertainment such as AV services and games such as audio and video from the server 102 using headphones 110 and a monitor 111 via a wireless transmission path.

  However, if there is a risk that the aircraft will fluctuate greatly due to airflow during the flight, the crew member 100 will send a hand from the PA input unit 101 to the server 102 in order to prompt the passenger to sit on the seat or attach the seat belt. An interrupt command is transmitted by a power source such as a microphone or a SW, and emergency communication is started.

  Upon receiving the interrupt command and emergency contact data (for example, information such as video and audio), the server 102 immediately divides the interrupt command and the emergency contact data into a predetermined data format (for example, data into a predetermined data size). The data importance level flag is assigned to each divided data), and the data is immediately transmitted to the transmitting apparatus 103.

  In the transmission device 103, the received data is input to the data confirmation unit 104, the data confirmation unit 104 confirms the importance flag of the data, and the parity data amount to be added to the data according to the importance and data interleaving Generate a long parameter.

  Further, the parameter and data generated by the data confirmation unit 104 are transmitted to the error correction addition processing unit 301. The error correction addition processing unit 301 adds a parity that has been arithmetically processed to the data according to the parameter, and performs data interleaving processing. The data is converted into a wireless data format and transmitted to the outside of the transmitting apparatus 103 via the transmitting antenna 106.

  The error correction unit 302 of the reception apparatus 108 that has received the data from the transmission antenna 106 via the reception antenna 107, for example, when data is missing in the wireless transmission path, performs arithmetic interpolation of the missing data using parity data, Depending on the importance level (high importance level data) is preferentially output to the headphone 110 and the monitor 111 which are the output destinations of the receiving device 108 to the passenger without passing through the buffer held.

  However, if the missing data cannot be interpolated even after performing the arithmetic processing, it waits for a predetermined time and transmits the next data after the missing data.

  Next, the operation of the transmitting apparatus 103 will be described in detail with reference to FIGS.

  FIG. 4 is a configuration diagram of the data confirmation unit 104 of the transmission device 103 in the present application. In FIG. 4, reference numeral 401 denotes a data reception buffer for receiving audio / video viewing data, emergency communication, and the like from the server 102. A data analysis unit 402 analyzes the importance of data from the data reception buffer 401. Reference numeral 403 denotes a parameter generation unit that generates a parameter at the time of transmission by referring to an internal parameter table in accordance with the result of the data analysis unit.

  FIG. 8 is an example of a parameter table in the present application. In FIG. 8, the contents of the service are classified in advance according to importance, and parameters are referred to according to the importance.

  Usually, a passenger receives entertainment content from the server 102 from the transmission device 103 via a wireless path, and enjoys audio and video viewing data or a game using the headphones 110 and the monitor 111. Data processing in this case will be described.

  The data reception buffer 401 buffers data (entertainment content) from the server 102 and transmits it to the data analysis unit 402 at regular intervals. The data analysis unit 402 that has received the data analyzes the data that has been converted into a predetermined data format in advance, detects the importance flag in the data, and the result of the importance flag (entertainment content = The importance 4) is transmitted to the parameter generator 403.

  The parameter generation unit 403 generates necessary parameters with reference to the parameter table of FIG. Since the importance flag is “4” this time, the parameter in the “4” column of importance is referred to.

  That is, in this case, the parameter generation unit 403 provides parameters for error correction such as “4: 1” as the ratio of data to be transmitted and parity for error correction and “20” as the data interleave length. Sent.

  The data confirmation unit 104 transmits the generated parameters and data to the error correction addition processing unit 301. According to the received parameter, the error correction addition processing unit 301 adds error correction (parity data) obtained by performing 20% arithmetic processing on 80% of the data, and after distributing the data according to the interleave length, converts the data into a predetermined transmission format. The data is converted and output to the outside of the transmitting apparatus 103 as data modulated by the transmitting antenna 106.

  As described above, since the importance level of entertainment / content data is lower than that of emergency contact, a parameter that can acquire as much transmission band as possible is set as a service form.

  On the other hand, data processing when an emergency call occurs while a passenger enjoys viewing data or a game will be described.

  The data reception buffer 401 buffers data (video or audio for emergency contact use) from the server 102 and transmits it to the data analysis unit 402 at regular intervals. The data analysis unit 402 that has received the data analyzes the data that has been converted into a predetermined data format in advance, detects the importance flag in the data, and the result of the importance flag (emergency broadcast = important Degree 1) is transmitted to the parameter generation unit 403.

  The parameter generation unit 403 generates necessary parameters with reference to the parameter table of FIG. Since the importance flag is “1” this time, the parameter in the “1” column of importance is referred to. That is, in this case, the parameter generation unit 403 transmits parameters for error correction such as “1: 1” as the data to be transmitted and the parity ratio and “200” as the interleave length.

  The data confirmation unit 104 transmits the generated parameters and data to the error correction addition processing unit 301. The error correction addition processing unit 301 adds error correction (parity data) calculated by 50% of the data to 50% according to the received parameter, and after distributing the data according to the interleave length, converts the data into a predetermined transmission format. The data is converted and output to the outside of the transmitting apparatus 103 as data modulated by the transmitting antenna 106.

  As mentioned above, the importance of emergency contact data is the highest, so the transmission bandwidth is effectively used without reducing the transmission speed, error correction (parity data) is added to the data to be transmitted, and the interleave length is followed. By distributing the data, parameters that can transmit the data more reliably are set.

  As explained above, the transmission bandwidth and the modulation method are not changed according to the importance of the data (service) of the wireless transmission, but the transmission band is utilized to the maximum, and the data according to the importance of the wireless transmission data. By generating a parameter for changing the amount of data parity to be added and the interleave length, it is possible to realize emergency delivery to passengers with higher probability in one transmission.

  Also, the effectiveness (real-time property) of parameter correction at the time of transmission, which has been a conventional problem, can be realized by changing the parameters at the time of transmission according to the importance of data (service) for wireless transmission.

  Furthermore, by changing the parity amount and interleave length for error correction added to the data depending on the importance of the data to be transmitted, when there is no feedback or retransmission request of the radio wave status at the time of multicast transmission, which was a problem of the conventional method, With a single transmission, the probability is higher and it is possible to deliver emergency contact to passengers.

  Note that in this embodiment, the use method in an aircraft is described as an example, but the present invention is not limited to an aircraft, and is not limited to an aircraft, but in an audiovisual room, a movie theater, a train (vehicle), or a baseball The same effect can be expected even in outdoor areas where soccer, racing, and racetracks are limited.

  In the present embodiment, the emergency contact of the crew member is performed via a wire. However, the present embodiment is not limited to a wire connection, and the same effect can be expected even when an equivalent emergency contact is transmitted via a wireless connection.

  Further, in this embodiment, the explanation is made in the state where the importance flag setting of data and service is set in advance, but setting the preset is not limited to the aircraft company, and information and services that the passenger wants The same effect can be expected even when a mechanism capable of setting the importance level according to (importance 1 is essential) is implemented.

  In this embodiment, the emergency contact is mainly described as an in-flight announcement by the crew, but the present invention is not limited to the announcement. For example, the same effect can be obtained in the case of data from a VTR such as an escape route or entry procedures. Can be expected.

  In this embodiment, as an example, data, parity ratio, and interleave length are described as parameters when error correction is added, but the parameters are not limited to these, and any of these is applied. But the same effect can be expected.

  In the present embodiment, as an example, parameters (data, parity ratio, and interleave length) at the time of error correction are set to fixed values according to the data. However, the parameters are not necessarily limited to fixed values, but are set fixed values. The same effect can be expected even when the parameter is set taking into consideration the parameter having a margin more than the value (a method with a higher error correction capability (increasing the amount of parity data and increasing the interleave length)).

  In this embodiment, as an example, parameters (data, parity ratio, and interleave length) at the time of error correction are fixed values according to data. However, the parameters are not necessarily limited to fixed values, and are not limited to unicast transmission. In this case, a parameter with more margin (a parameter table taking into consideration the relationship between the radio wave status, the parity amount, and the interleave length is prepared in advance) from information on the radio wave status such as CQI from the receiving side and CRC error. The same effect can be expected even when set in consideration.

  In this embodiment, as an example, parameters for error correction (data, parity ratio, and interleave length) are given according to the importance of data. However, in consideration of the data size and transmission band to be actually transmitted. It is necessary to design the parameter table.

  Further, by combining any one of the embodiments shown in 1 to 3 of the present embodiment, it is possible to expect an effect that the correction capability is higher with respect to an error during transmission.

  In the embodiments shown in the first to third embodiments, the parameters are switched by the importance flag. However, the parameters are not limited to the importance flag, and the announcement SW and the microphone ON / OFF are not limited. The same effect can be expected even when the parameter is switched by a signal such as OFF.

  Since the wireless transmission device, the wireless reception device, and the wireless system according to the present invention can be easily switched in accordance with data, the wireless transmission device, the wireless reception device, and the wireless system are useful for, for example, a system that distributes an emergency broadcast on an airplane or the like.

Configuration diagram of radio transmission apparatus, radio reception apparatus, and radio system in Embodiment 1 of the present invention Configuration diagram of radio transmission apparatus, radio reception apparatus, and radio system in Embodiment 2 of the present invention Configuration diagram of radio transmission apparatus, radio reception apparatus, and radio system in Embodiment 3 of the present invention Configuration diagram of data confirmation unit in Embodiments 1 to 3 of the present invention The figure which shows an example of the parameter table which the data confirmation part in Embodiment 1 of this invention holds. The figure which shows an example of the parameter table which the data confirmation part in Embodiment 2 of this invention holds. The figure which shows the data multiplexing example of the data transmission frequency switch part in Embodiment 2 of this invention The figure which shows an example of the parameter table which the data confirmation part in Embodiment 3 of this invention holds.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Crew 101 PA input part 102 Server 103 Transmission apparatus 104 Data confirmation part 105 Transmission speed switching part 106 Transmission antenna 107 Reception antenna 108 Reception apparatus 109 Data reception part 110 Headphone 111 Monitor 201 Data transmission frequency switching part 202 Data separation part 301 Error correction Additional processing unit 302 Error correction unit

Claims (17)

Within the wireless area,
A data confirmation unit for confirming transmission data;
Input the data from the data confirmation unit, a transmission rate switching unit that switches the transmission rate at the time of transmission according to the importance of the data,
A transmission antenna for wirelessly outputting data from the transmission rate switching unit;
A transmission device comprising: Within the wireless area,
A data confirmation unit for confirming transmission data;
A data transmission number switching unit that receives data from the data confirmation unit and switches the number of data transmissions at the time of transmission according to the importance of the data;
A transmission antenna for wirelessly outputting data from the data transmission frequency switching unit;
A transmission device comprising: Within the wireless area,
A data confirmation unit for confirming transmission data;
An error correction addition processing unit that receives data from the data confirmation unit and switches redundancy of error correction to be added to data at the time of transmission according to the importance of the data;
A wireless transmission antenna for wirelessly outputting data from the error correction addition processing unit;
A transmission device comprising: The transmission apparatus according to any one of claims 1 to 3, further comprising a server that accumulates data inside the apparatus or inside the apparatus, or converts the data into a predetermined format and transmits the data. The server comprises an emergency contact input unit comprising means for inputting important information such as emergency contact inside or outside, and means for notifying that the information is important or giving an interrupt. The transmission device according to claim 4. The data confirmation unit includes a data reception unit that receives data or an important notification signal from the server, a data analysis unit that analyzes whether the received data is to realize a predetermined service within a predetermined time, and By referring to the parameter table held internally from the result of the data analysis unit or the important notification signal, determining a parameter adapted to the transmission data, and providing a parameter generation unit having a function of transmitting the data and the parameter, thereby transmitting 4. The transmission apparatus according to claim 1, wherein a transmission parameter most suitable for the data to be transmitted is generated. The parameter table is data obtained by adding importance of data set in advance, a transmission rate when wirelessly transmitting according to the importance of data, a modulation method used during transmission, or error correction during transmission. 7. The transmission apparatus according to claim 6, wherein one of the parameters of the coding rate is held and at least one of the parameters is generated according to the importance of data to be transmitted. The parameter table is a parameter that determines the importance of data set in advance and the number of times of duplication of data when wirelessly transmitting according to the importance of the data. One of the parameters of the degree of dispersion for transmitting data to be repeatedly transmitted at a predetermined interval so that the data is not continuously transmitted is held, and at least one of the parameters according to the importance of the data to be transmitted The wireless system according to claim 6, wherein: The parameter table is used for rearranging the order of data blocks and the data parity ratio indicating the ratio of the original data and the error correction parity according to the importance of the data set in advance and the importance of the data. 7. The transmission apparatus according to claim 6, wherein any one parameter of interleave length to be used is held, and at least one of the parameters is generated according to the importance of data to be transmitted. The transmission rate switching unit receives data and parameters from the data confirmation unit, and sets at least one of a transmission rate, a modulation scheme, and a coding rate as a parameter at the time of transmission according to the parameters, and wirelessly The transmission apparatus according to claim 1, wherein the transmission apparatus performs transmission. The data transmission frequency switching unit receives data and parameters from the data confirmation unit, repeatedly transmits the same data a predetermined number of times at predetermined intervals according to the parameters, and performs wireless transmission The transmission device according to claim 2. The error correction addition processing unit receives data and parameters from the data confirmation unit, sets a data parity ratio and an interleave length used for error correction according to the parameters, and adds error correction information to the data The transmission apparatus according to claim 3, wherein the transmission apparatus performs wireless transmission later. A transmission device according to claim 1;
A receiving antenna for receiving data from the transmitting antenna;
A data receiver for separating data from the receiving antenna into a header and data;
Means for storing the separated data in a buffer and outputting the data to the outside;
A receiving device comprising:
A wireless system comprising: A transmission device according to claim 2;
A receiving antenna for receiving data from the transmitting antenna;
A data separator that separates data from the receiving antenna into a header and data and rearranges the data order;
Means for storing the sorted data in a buffer and outputting the data to the outside;
A receiving device comprising:
A wireless system comprising: A transmission device according to claim 3;
A receiving antenna for receiving data from the transmitting antenna;
An error correction unit that performs error correction of missing data using data from the receiving antenna, means for accumulating data after error correction in a buffer and outputting the data to the outside;
A receiving device comprising:
A wireless system comprising: The receiver includes a data separator that receives data from the transmitter, separates multiplexed data, interpolates missing data from other multiplexed areas, rearranges the data order, and outputs the data to the outside. 16. The wireless system according to claim 13, wherein the data is output to the outside without passing through an internal buffer according to the importance of the data. The receiving device includes an error correction unit that receives data from the transmitting device, uses data that has been subjected to error correction addition processing, and performs correction calculation processing of missing data, and includes internal data depending on the importance of the data 16. The wireless system according to claim 13, wherein the wireless system outputs the signal to the outside without passing through a buffer held by the device.

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