JP2006013897A - Transmission system, transmission control method thereof, communication device and transmission right management unit deciding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that data transmission between communication devices delays due to the deterioration of a transmission path status between a transmission right management device and each of communication devices, in a coaxial transmission system for performing time division multiple communication. <P>SOLUTION: The system is provided with the communication device 111, the transmission right management unit deciding device 12 and a transmission path 13. The device 111 has a transmission path state checking unit 143 for checking the state of the transmission path with the other communication device 112, a transmission path state holding unit 145 for holding the result of the transmission state checking, a transmission path information transmission control unit 144 for causing to transmit the transmission path state checking result to the device 12, and a transmission right management unit 149 for managing and assigning a transmission time band between each of communication devices. The device 12 has a transmission path information receiving unit 151 for receiving the transmission path state checking result from each of the communication devices, a transmission right management unit deciding unit 154 for deciding one communication device 111 for operating the unit 149 on the basis of the transmission path state checking result, and a transmission right management unit information transmitting unit 152 for transmitting the information of the decided one communication devices 111 to all the communication device 111 and 112. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transmission system that performs demand assignment time division multiple access (TDMA) communication, a transmission control method for the transmission system, a communication device, and a transmission right management unit determination device. For example, the present invention relates to a transmission system that performs transmission and reception between communication devices while sharing a transmission band, a transmission control method for the transmission system, a communication device, and a transmission right management unit determination device.

  Hereinafter, an embodiment of a transmission system including a communication device that performs conventional demand assignment TDMA communication and a transmission right management device that gives a transmission right will be described with reference to the drawings.

  TDMA communication is widely known as a communication method in which a transmission band is divided in time to form a time slot for information transmission, and the time slot is assigned to a communication apparatus that transmits information. In this communication method, a TDMA frame, which is a basic cycle of a transmission path, is divided in time into a number of time slots, and each communication device transmits information to the other communication device using one of these time slots. To do. Then, the partner communication device selects a time slot addressed to itself from among a number of time slots and receives information.

  In TDMA communication, when a plurality of communication devices use the same time slot at the same time, a plurality of signals collide with each other and correct information cannot be transmitted. For this reason, it is necessary to prevent a time slot in use by any one communication apparatus from being used by another communication apparatus.

  In demand assignment TDMA communication, as a countermeasure, each communication device issues a transmission request to the transmission right management device every time information transmission occurs, and the transmission right management device selects an empty slot and sends the transmission right to each communication device. (See, for example, Patent Document 1). Thereby, the collision of a plurality of signals is avoided.

  FIG. 10 is a configuration diagram of a communication system that performs demand-assigned TDMA communication according to a conventional example.

  This communication system includes communication devices 511 to 51n, a transmission right control device 52, and a coaxial transmission line 53 that connects the communication devices 511 to 51n and the transmission right control device 52.

  FIG. 11 is a time frame of the communication system shown in FIG.

  The time frame includes a transmission request period 61 in which the communication devices 511 to 51n transmit a transmission request, a transmission right notification period 62 in which transmission right information assigned by the transmission right control device 52 is transmitted, and the communication devices 511 to 51n in other communication devices. 511 to 51n and a frame of an information transmission period 63 for transmitting information. An information transmission period with another communication apparatus assigned to one communication apparatus constitutes one frame, and an information transmission period 63 is composed of a plurality of frames indicating the information transmission period in each communication apparatus. Yes. Here, a frame indicating an information transmission period between the communication device 511 and the communication device 512 assigned to the communication device 511 is set to 64.

  FIG. 12 shows a configuration of transmission request information of the communication system shown in FIG.

  The transmission request information includes transmission destination information 71 (communication device ID or the like) and transmission source information 72 (communication device ID or the like).

  FIG. 13 shows a configuration of allocation information of the communication system shown in FIG.

  The allocation information includes transmission destination information 81 (communication device ID or the like) of the allocated transmission right, transmission source information 82 (communication device ID or the like) of the allocated transmission right, and allocated transmission period information 83. ing.

  In the following, operations in the communication devices 511 and 512 and the transmission right control device 52 when transmission is performed from the communication device 511 to the communication device 512 in the communication system illustrated in FIG. 10 will be described.

  The communication device 511 generates transmission request information from the transmission destination information 71 (communication device ID or the like) of the communication device 512 that is the transmission destination and the transmission source information 72 of the own communication device 511 that is the transmission source. Then, during the transmission request period 61, the transmission request information is transmitted to the transmission right control device 52 through the coaxial transmission line 53.

  The transmission right control device 52 receives the transmission information from each of the communication devices 511 to 51n from the coaxial transmission line 53, and extracts the transmission request information from the transmission information received in the transmission request period 61 shown in FIG. Then, from the transmission destination information 71 (in this case, the communication device 512) and the transmission source information 72 (in this case, the communication device 511), the communication devices 511 to 51n (in this case) so that transmissions between the plurality of communication devices do not collide with each other. Performs transmission right assignment processing to the communication device 511).

  Then, the transmission right control device 52 generates transmission right information to the communication devices 511 to 51n configured by the transmission destination information 81, the transmission source information 82, and the transmission period information 83 from the assigned transmission right, and transmits the transmission right. In the notification period 62, the transmission right information is transmitted to the communication devices 511 to 51n through the coaxial transmission line 53.

  The communication device 511 receives the transmission right information from the coaxial transmission line 53 during the transmission right notification period 62. Then, in the information transmission period 64 between the communication apparatus 511 and the communication apparatus 512 within the information transmission period 63 assigned by the transmission destination information 81, the transmission source information 82, and the transmission period information 83, the coaxial transmission line 53 is connected to the communication apparatus 512. Send transmission information through

  The communication device 512 receives the transmission right information from the coaxial transmission line 53 during the transmission right notification period 62. The transmission information from the communication device 511 is transmitted during the information transmission period 64 between the communication device 511 and the communication device 512 within the information transmission period 63 assigned by the transmission destination information 81, the transmission source information 82, and the transmission period information 83. Receive.

In this way, the communication device 511 transmits a transmission request to the transmission right control device 52, and the transmission right control device 52 determines the transmission right so that transmissions between the communication devices do not collide with each other based on the transmission request. By performing the assignment, information can be transmitted between the communication devices.
JP-A-2-183644

  However, when the conventional transmission control method described above is used in a demand assign TDMA communication system, if the transmission path state between the transmission right control device and the communication device is bad, the transmission right control device responds to a transmission request from the communication device. As a result, transmission of information between communication devices is delayed. In the case of data that requires immediacy, such as video data, data cannot be transmitted at the time to be transmitted, and reproduction data may be lost.

  Further, when the conventional transmission control method is used, when the transmission path state between the transmission right control device and the communication device deteriorates during the operation of the communication system, the transmission right control is performed for the transmission request from the communication device. There is also a problem that transmission of the transmission right assigned by the apparatus is delayed, and as a result, transmission efficiency is lowered. In particular, in a system using a coaxial cable including a distributor, a change in the transmission path state with time is large, and such a problem is likely to occur.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and provides a transmission system capable of performing immediate communication and performing data communication with high transmission efficiency, a transmission control method for the transmission system, a communication device, and a transmission right management unit determination device. The purpose is to provide.

In order to solve the above-described problem, the first aspect of the present invention provides:
A plurality of communication devices having a transmission right management unit that manages and assigns a transmission unit, a reception unit, and a time zone for transmitting and receiving signals between the communication devices;
Of the plurality of communication devices, a transmission right management unit determination device that determines one communication device that operates the transmission right management unit;
A transmission path for communicating each of the plurality of communication devices and the transmission right management unit determination device,
Each of the plurality of communication devices is
A transmission line state inspection unit that inspects a transmission line state between each of the other communication devices using the transmission unit and the reception unit;
A transmission line state holding unit for holding a transmission line state inspection result inspected by the transmission line state inspection unit;
A transmission path information transmission control unit that transmits the transmission path state inspection result to the transmission right management unit determination apparatus using the transmission unit;
The transmission right management unit determination device includes:
A transmission path information receiving unit that receives a transmission path state inspection result from each of the plurality of communication devices;
A transmission right management unit determining unit that determines the one communication device that operates the transmission right management unit based on the transmission path state inspection result;
The transmission system includes a transmission right management unit information transmission unit that transmits information of the determined one communication device to all the communication devices.

The second aspect of the present invention
When the transmission path information transmission control unit transmits the transmission path state inspection result to the transmission right management unit determination device, the transmission channel information transmission control unit is also transmitted to another communication device.
The transmission right management unit of the determined one communication device allocates a time zone for transmitting and receiving signals between the communication devices using the transmission path state inspection result received from each communication device. It is a transmission system.

The third aspect of the present invention provides
The transmission right management unit information transmission unit transmits a transmission path state inspection result received from each of the plurality of communication devices to the determined one communication device,
The transmission right management unit of the determined one communication device uses the transmission path state inspection result received from the transmission right management unit information transmission unit, and assigns a time zone for transmitting and receiving signals between the communication devices. 1 is a transmission system according to a first aspect of the present invention;

The fourth invention relates to
The transmission system according to the first aspect of the present invention, wherein any one of the plurality of communication devices also serves as the transmission right management unit determination device.

The fifth aspect of the present invention relates to
When power is supplied to the communication device,
The transmission line state inspection unit inspects the transmission line state,
The transmission path information transmission control unit transmits the transmission path state inspection result to the transmission right management unit determination device,
The transmission right management unit determination unit is the transmission system according to the first aspect of the present invention, which re-determines the one communication device that operates the transmission right management unit.

The sixth invention relates to
The transmission line state inspection unit inspects the transmission line state every predetermined time,
The transmission path information transmission control unit then transmits the transmission path state inspection result to the transmission right management unit determination device,
The transmission right management unit determination unit is the transmission system according to the first aspect of the present invention, which re-determines the one communication device that operates the transmission right management unit.

The seventh invention relates to
Each of the plurality of communication devices further includes a transmission error measurement unit that measures a transmission error amount during information transmission with another communication device,
The transmission path state inspection unit inspects the transmission path state when a transmission error amount with a communication apparatus in which the transmission right management unit is operating exceeds a preset transmission error amount,
The transmission path information transmission control unit transmits the transmission path state inspection result to the transmission right management unit determination device,
The transmission right management unit determination unit is the transmission system according to the first aspect of the present invention, which re-determines the one communication device that operates the transmission right management unit.

The eighth invention relates to
The transmission path state between each of the other communication devices is a communication speed with each of the other communication devices,
The transmission right management unit determination unit determines the communication device having the largest total communication speed with each of the other communication devices as the one communication device that operates the transmission right management unit. It is the transmission system of this invention.

The ninth invention relates to
The transmission path state between each of the other communication devices is a communication speed with each of the other communication devices,
The transmission right management unit determination unit compares the slowest communication speeds among the communication speeds between the respective communication devices and the communication device having the largest value of the slowest communication speed. Is the transmission system according to the first aspect of the present invention, in which the transmission right management unit is determined to be the one communication device.

The tenth aspect of the present invention is
A plurality of communication devices having a transmission right management unit that manages and assigns a transmission unit, a reception unit, and a time zone for transmitting and receiving signals between the communication devices;
A transmission path for communicating each of the plurality of communication devices with each other,
Each of the plurality of communication devices is
A transmission line state inspection unit that inspects a transmission line state between each of the other communication devices using the transmission unit and the reception unit;
A transmission line state holding unit for holding a transmission line state inspection result inspected by the transmission line state inspection unit;
The transmission path state inspection result is transmitted to all other communication devices using the transmission section, a transmission path information transmission control section,
From each of all other communication devices, a transmission path information acquisition unit that acquires a transmission path state inspection result using the reception unit;
A transmission right management unit determining unit that determines which transmission right management unit of any communication device operates based on the acquired transmission path state inspection result on the same basis in any communication device. System.

The eleventh aspect of the present invention is
Each of a plurality of communication devices connected to the transmission path inspects the transmission path status with other communication apparatuses;
Each of the plurality of communication devices transmits a transmission path state inspection result obtained by inspecting the transmission path state to a transmission right management unit determination apparatus connected to the transmission path;
The transmission right management unit determination device allocates a time zone for transmitting and receiving signals between the communication devices out of the plurality of communication devices, based on the transmission path state inspection result received from each of the plurality of communication devices. Determining one communication device to be performed;
A transmission control method for a transmission system, comprising: the transmission right management unit determining apparatus transmitting information of the determined one communication apparatus to all the communication apparatuses.

The twelfth aspect of the present invention is
It is a communication apparatus of the transmission system of 1st this invention.

The thirteenth aspect of the present invention is
It is a transmission right management part determination apparatus of the transmission system of 1st this invention.

The fourteenth aspect of the present invention is
Of the communication device of the transmission system of the first aspect of the present invention;
The transmitter,
The receiver,
The transmission right management unit that manages and assigns time zones for transmitting and receiving signals between the communication devices,
The transmission path state inspection unit that inspects the transmission path state between each other communication device,
The transmission line state holding unit for holding the transmission line state inspection result inspected by the transmission line state inspection unit,
It is a program for causing a computer to function as the transmission path information transmission control unit that transmits the transmission path state inspection result to the transmission right management unit determining apparatus.

The fifteenth aspect of the present invention is
A recording medium carrying the program of the fourteenth aspect of the present invention, which is a recording medium usable by a computer.

The sixteenth aspect of the present invention
The transmission right management unit determining device of the first aspect of the present invention,
The transmission path information receiving unit that receives a transmission path state inspection result from each of the plurality of communication devices,
The transmission right management unit determining unit that determines the one communication device that operates the transmission right management unit based on the transmission path state inspection result;
A program for causing a computer to function as the transmission right management unit information transmission unit that transmits information of the determined one communication device to all communication devices.
Gram.

The seventeenth aspect of the present invention provides
A recording medium carrying the program of the sixteenth aspect of the present invention, which is a recording medium usable by a computer.

  According to the present invention, it is possible to provide a transmission system, a transmission system transmission control method, a communication apparatus, and a transmission right management unit determination apparatus that can perform immediate communication and perform data communication with high transmission efficiency.

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

(Embodiment 1)
FIG. 1 is a configuration block diagram of a coaxial transmission system according to Embodiment 1 of the present invention.

  The coaxial transmission system according to the first embodiment includes communication devices 111 to 11n, a transmission right management unit determination device 12, and a coaxial transmission line 13 that connects the communication devices 111 to 11n. The coaxial transmission line is an example of the transmission line of the present invention.

  The communication devices 111 to 11n respectively receive signals from the other communication devices 111 to 11n via the coaxial transmission path 13, and transmit signals to the other communication apparatuses 111 to 11n to the coaxial transmission path 13. The transmission unit 142, the transmission line state inspection unit 143 that inspects the transmission line state between the communication devices 111 to 11n other than the own communication device, and the transmission line state inspection unit 143 that instructs the transmission line state inspection unit 143 to inspect the transmission line state. A transmission line state inspection control unit 144 to perform, and a transmission line state holding unit 145 for holding information on the result of the transmission line state inspected by the transmission line state inspection unit 143 are provided. Also, the transmission path state information is generated from the information of the communication apparatus inspected by the transmission path state inspection unit 143 and the transmission path state between each of the other communication apparatuses held by the transmission path state holding unit 145. A transmission path state information generation unit 146 is provided. The transmission path state information generation unit 146 is an example of the transmission path information transmission control unit of the present invention.

  Each of the communication devices 111 to 11n includes a transmission right management unit 149 that manages and assigns a time zone for communication between the communication devices. In the coaxial transmission system according to the first embodiment, one coaxial communication device is determined as a communication device that manages the transmission right, and the transmission right management unit 149 of the communication device is operated, whereby the coaxial transmission according to the first embodiment is performed. Realizes demand-assigned TDMA communication in a transmission system.

  The transmission right management unit determination device 12 receives a signal from each of the communication devices 111 to 11n via the coaxial transmission line 13, and sends a signal to each of the communication devices 111 to 11n to the coaxial transmission line 13. A management unit information transmission unit 152 for transmission and a transmission path state table creation unit 153 for creating a transmission path state table between the communication devices 111 to 11n are provided. Further, based on the transmission path state table created by the transmission path state table creation unit 153, the communication apparatuses 111 to 11n that determine that the transmission path state with the communication apparatus other than the own communication apparatus is the best are transmitted right management sections. 149 includes a transmission right management unit determining unit 154 that determines one communication device that operates 149.

  FIG. 2 shows a configuration of transmission path state information of the coaxial transmission system according to the first embodiment.

  The transmission path state information includes communication apparatus information 21 (communication apparatus ID and the like) and inter-communication apparatus transmission path state information 22.

  In the following, operations in each of the communication devices 111 to 11n and the transmission right management unit determination device 12 when determining a communication device that operates the transmission right management unit 149 in the coaxial transmission system of the first embodiment will be described. .

  FIG. 3 shows a procedure for determining a communication apparatus for operating the transmission right management unit 149 in the coaxial transmission system according to the first embodiment.

  FIG. 4 is a transmission path state table created by the transmission path state table creation unit 153 of the transmission right management unit determination apparatus 12. Here, the transmission speed (unit: bps) between the communication apparatuses is used as an example of the transmission path state. In addition, here, four communication devices are configured.

  First, when the power of the communication devices 111 to 11n is supplied (S11), between each other communication device (or the communication devices 112 to 11n when the communication device to which the power is supplied is the communication device 111). The transmission path state is inspected (S12). Then, the result information of the transmission line state checked by the transmission line state inspection unit 143 is held in the transmission line state holding unit 145 (S13).

  Next, the transmission path state information generation unit 146 includes communication apparatus information 21 (communication apparatus ID or the like) indicating the communication apparatus inspected by the transmission path state inspection unit 143, and the transmission path held by the transmission path state holding unit 145. The transmission path state information as shown in FIG. 2 composed of the communication apparatus transmission path state information 22 based on the state result information is generated (S14).

  Then, using the transmission unit 142, the transmission path state information generated by the transmission path state information generation unit 146 is transmitted to the transmission right management unit determination apparatus 12 via the coaxial transmission path 13 (S15).

  In the transmission right management unit determination device 12, the transmission path information reception unit 151 receives the transmission path state information transmitted from each of the communication apparatuses 111 to 11 n via the coaxial transmission path 13. Then, the transmission path state table creation unit 153 creates the transmission path state table (FIG. 4) shown in FIG. 4 (S16).

  Then, the transmission right management unit determination unit 154 operates the transmission right management unit 149 for a communication device that determines that the transmission line state with the communication device other than the own communication device is the best based on the transmission line state table. The communication device (in the case of FIG. 4, the communication device 112) is determined (S17).

  Then, the management unit information transmission unit 152 transmits information (communication device ID, etc.) of one communication device that operates the transmission right management unit 149 determined by the transmission right management unit determination unit 154 to each communication through the coaxial transmission line 13. It transmits to the devices 111 to 11n.

  Thereafter, the transmission right management unit 149 of the one communication device (communication device 112 in the case of FIG. 4) decided to operate the transmission right management unit 149 operates, and the communication device 112 is connected between the communication devices 111 to 11n. The time zone for communication is managed, and the time zone for communication between each of the communication terminals 111 to 11n is assigned according to a transmission request from another communication device.

  Here, an example of a method for inspecting a transmission line state performed by the transmission line state inspection unit 143 will be described for a case where the communication apparatus 111 performs as an inspection source.

  The communication device 111 uses the transmission unit 142 to transmit the inspection information having the highest modulation efficiency (modulation method and transmission bandwidth) from the transmission line state inspection unit 143 according to the instruction of the transmission line state inspection control unit 144. Through the communication device 112-11n.

  In the communication devices 112 to 11 n, the inspection information is received from the coaxial transmission path 13 by the receiving unit 141. Then, the transmission path state inspection unit 143 checks whether there is an error in the received information. If there is no error in the information, “inspection is completed”, and if the information is in error, “inspection is incomplete” The inspection result information is transmitted to the communication device 111 using the transmission unit 142.

  Next, the communication device 111 receives the inspection result information from the communication devices 112 to 11n by the receiving unit 141. When the inspection result information is “inspection complete”, the transmission line state inspection unit 143 causes the transmission line state holding unit 145 to hold the modulation efficiency at the time when the inspection is completed as the transmission line state. In the case of “inspection incomplete”, in accordance with an instruction from the transmission path state inspection control unit 144, the transmission path state inspection unit 143 sends inspection information with reduced modulation efficiency to the communication devices 112 to 11n using the transmission unit 142. Send. The communication device 111 repeatedly performs this inspection process until receiving the inspection result information of “inspection complete”.

  The inspection method shown here is an example, and any method can be used as long as appropriate modulation efficiency can be detected. In this example, the transmission path state information is modulation efficiency, but the transmission rate per unit time may be used as long as the information can express the transmission path state.

  Next, an example of a method for determining that the transmission path state with the communication device other than the own communication device is the best in the transmission right management unit determination unit 154 will be described.

  In the description of the first embodiment, the communication device having the highest total transmission speed with each of the other communication devices has the best transmission path state with the communication device other than the own communication device. It is judged that it is a proper communication device. In the case of the contents of the transmission path state table shown in FIG. 4, the total values of the transmission speeds with respect to the communication terminal of the inspection source with other communication apparatuses are 160 bps, 190 bps, 165 bps, 140 bps and the value when the inspection source is the communication device 112 is the largest, so it is determined that “the communication device 112 is the communication device with the best transmission path state with the communication device other than the own communication device”. ing.

  The method of determining that the transmission path state with the communication device other than the own communication device is the best is not limited to the above method, and may be determined by an appropriate method according to the transmission system. For example, among the transmission rates with other communication devices, the slowest transmission rates are compared, and the communication device with the fastest transmission rate is referred to as “the communication device with the best transmission path state with the communication device other than the own communication device”. You may make it judge that it is. Based on this determination method, in the case of the numerical values shown in FIG. 4, the communication device 112 or the communication device 113 whose slowest transmission speed with another communication device is 50 bps is “transmission with a communication device other than its own communication device”. It is determined that the communication device has the best road condition.

  Also, it is a condition that the communication device of the inspection destination excludes the communication device of the transmission source including the communication device that cannot communicate, and the determination is made in consideration of the amount of information transmitted between the communication devices. Also good.

  As described above, in the coaxial transmission system according to the first embodiment, each communication device inspects the state of the transmission path between the communication devices at the time when power is supplied, and the communication device holds and transmits the inspection result. To the right management unit determination device, and the transmission right management unit determination device manages the transmission right of the communication device with the best transmission path state with the communication device other than the own communication device based on the transmission path information between the communication devices. By determining the communication device as one communication device, the transmission quality between the transmission right management device and each communication device is improved, and the transmission right is efficiently allocated to the transmission request from each communication device, Communication with high transmission efficiency can be performed between communication devices.

(Embodiment 2)
FIG. 5 is a block diagram showing the configuration of the coaxial transmission system according to Embodiment 2 of the present invention. In addition, the same number is attached | subjected to the part of the structure which has the same function as the coaxial transmission system of Embodiment 1 of this invention, and the description is abbreviate | omitted.

  Each of the communication devices 111 to 11n includes a transmission path state inspection time measuring unit 31 in addition to the configuration of the communication device of the first embodiment. The transmission line state inspection time measuring unit 31 measures the time when the transmission line state inspection control unit 144 gives an instruction to start the transmission line state inspection to the transmission line state inspection unit 143.

  The transmission path state information of the coaxial transmission system of the second embodiment has the same configuration as the transmission path state information of the first embodiment shown in FIG.

  In the following, operations in each of the communication devices 111 to 11n and the transmission right management unit determination device 12 when determining a communication device that operates the transmission right management unit 149 in the coaxial transmission system of the second embodiment will be described. .

  FIG. 6 shows a procedure for determining a communication apparatus for operating the transmission right management unit 149 in the coaxial transmission system according to the second embodiment.

  The configuration of the transmission path state table created by the transmission path state table creating unit 153 of the transmission right management unit determining apparatus 12 of the coaxial transmission system according to the second embodiment is the same as that shown in FIG. It has the same structure as the table.

  First, at the time when the power of the communication devices 111 to 11n is supplied, or when the time measured by the transmission path state inspection time measuring unit 31 reaches the inspection interval time (S31), each of the other communication devices (power If the communication device that has been supplied or has reached the inspection interval time is the communication device 111, the state of the transmission path with the communication devices 112 to 11n) is checked (S32).

  Here, the inspection interval time is a preset length of time, and when the state where the power of the communication device is supplied continues, the inspection interval time is changed at every predetermined inspection interval time. The transmission path state with the other communication device is inspected.

  Then, the result information of the transmission line state checked by the transmission line state inspection unit 143 is held in the transmission line state holding unit 145 (S33).

  Next, the transmission path state information generation unit 146 includes communication apparatus information 21 (communication apparatus ID or the like) indicating the communication apparatus inspected by the transmission path state inspection unit 143, and the transmission path held by the transmission path state holding unit 145. The transmission path state information as shown in FIG. 2 composed of the communication apparatus transmission path state information 22 based on the state result information is generated (S34).

  Then, using the transmission unit 142, the transmission path state information generated by the transmission path state information generation unit 146 is transmitted to the transmission right management unit determination apparatus 12 via the coaxial transmission path 13 (S35).

  In the transmission right management unit determination device 12, the transmission path information reception unit 151 receives the transmission path state information transmitted from each of the communication apparatuses 111 to 11 n via the coaxial transmission path 13. Then, the transmission path state table creation unit 153 creates a transmission path state table configured as shown in FIG. 4 (S36).

  Then, the transmission right management unit determination unit 154 operates the transmission right management unit 149 for a communication device that determines that the transmission line state with the communication device other than the own communication device is the best based on the transmission line state table. The communication device (in the case of FIG. 4, the communication device 112) is determined (S37).

  Then, the management unit information transmission unit 152 transmits information (communication device ID, etc.) of one communication device that operates the transmission right management unit 149 determined by the transmission right management unit determination unit 154 to each communication through the coaxial transmission line 13. It transmits to the devices 111 to 11n.

  Note that the same method as that described in Embodiment 1 can be used as the method of inspecting the transmission line state performed by the transmission line state inspection unit 143.

  In the coaxial transmission system according to the second embodiment, the transmission path state is periodically inspected, and the transmission right management unit of the communication apparatus having the best transmission path state with the communication apparatus other than the own communication apparatus is operated at that time. Therefore, in a system in which a change in the transmission path state with time is large, an efficient transmission right management unit of the communication apparatus can be operated according to the transmission path state, which is more efficient than in the case of the first embodiment. Communication can be realized.

  As described above, in the coaxial transmission system according to the second embodiment, each communication device inspects the transmission path state between the communication devices at the time when the power is supplied or every predetermined inspection interval time. The communication result is held by the communication device and transmitted to the transmission right management unit determination device, and the transmission right management unit determination device determines the transmission path state with the communication device other than the own communication device based on the transmission path information between the communication devices. Is determined as the one communication device that operates the transmission right management unit, the transmission quality between the transmission right management device and each communication device is improved, and transmission in response to a transmission request from each communication device. Rights are efficiently allocated, and communication with high transmission efficiency can be performed between communication apparatuses.

(Embodiment 3)
FIG. 7 is a configuration block diagram of the coaxial transmission system according to the third embodiment of the present invention. In addition, the same number is attached | subjected to the part of the structure which has the same function as the coaxial transmission system of Embodiment 1 of this invention, and the description is abbreviate | omitted.

  Each of the communication devices 111 to 11n includes a transmission error measurement unit 41, a transmission path inspection threshold holding unit 42, and an error inspection control unit 43 in addition to the configuration of the communication device of the first embodiment.

  The transmission error measurement unit 41 measures an information transmission error during information transmission with the communication device in which the transmission right management unit 149 is operating. The transmission path inspection threshold holding unit 42 holds a threshold for a transmission error with a communication device other than the own communication device. The error inspection control unit 43 compares the information transmission error value measured by the transmission error measurement unit 41 with the transmission error threshold value held by the transmission line inspection threshold value holding unit 42 to determine the transmission line state. Based on the determination result, the transmission line state inspection unit 143 instructs the transmission line state inspection control unit 144 to start inspection of the transmission line state.

  Here, the transmission error threshold held in the transmission path inspection threshold holding section 42 is a predetermined value that is determined in advance to determine that the transmission path state is bad, and the information transmission error value is the threshold value. Is exceeded, it is determined that the transmission path condition has deteriorated.

  The transmission path state information of the coaxial transmission system according to the third embodiment has the same configuration as the transmission path state information according to the first embodiment shown in FIG.

  In the following, operations in each of the communication devices 111 to 11n and the transmission right management unit determination device 12 when determining the communication device that operates the transmission right management unit 149 in the coaxial transmission system according to the third embodiment will be described. .

  FIG. 8 shows a procedure for determining a communication apparatus for operating the transmission right management unit 149 in the coaxial transmission system according to the third embodiment.

  The configuration of the transmission path state table created by the transmission path state table creation unit 153 of the transmission right management unit determination device 12 in the coaxial transmission system of the third embodiment is the same as that shown in FIG. This is the same configuration as the table.

  The transmission error measurement unit 41 of the communication devices 111 to 11n measures an information transmission error during information transmission with the communication device in which the transmission right management unit 149 is operating (S41). For example, when the transmission right management unit 149 of the communication device 112 is operating, the transmission error measurement unit 41 of the communication device 111 indicates a transmission error during the transmission while the communication device 111 is communicating with the communication device 112. taking measurement.

  Next, the error inspection control unit 43 compares the transmission error value measured by the transmission error measuring unit 41 with the transmission error threshold value held in advance in the transmission line inspection threshold value holding unit 42, and A determination is made (S42). When the error value measured by the transmission error measurement unit 41 exceeds the threshold, the error inspection control unit 43 causes the transmission line state inspection unit 143 to start the transmission line state inspection. An instruction is issued to the control unit 144 (S43).

  Then, the result information of the transmission line state checked by the transmission line state inspection unit 143 is held in the transmission line state holding unit 145 (S44).

  Next, the transmission path state information generation unit 146 includes communication apparatus information 21 (communication apparatus ID or the like) indicating the communication apparatus inspected by the transmission path state inspection unit 143, and the transmission path held by the transmission path state holding unit 145. The transmission path state information as shown in FIG. 2 composed of the communication apparatus transmission path state information 22 based on the state result is generated (S45).

  Then, using the transmission unit 142, the transmission line state information generated by the transmission line state information generation unit 146 is transmitted to the transmission right management unit determination device 12 via the coaxial transmission line 13 (S46).

  In the transmission right management unit determination device 12, the transmission path information reception unit 151 receives the transmission path state information transmitted from each of the communication apparatuses 111 to 11 n via the coaxial transmission path 13. Then, the transmission path state table creation unit 153 creates a transmission path state table configured as shown in FIG. 4 (S47).

  Then, the transmission right management unit determination unit 154 operates the transmission right management unit 149 for a communication device that determines that the transmission line state with the communication device other than the own communication device is the best based on the transmission line state table. The communication device is determined (S48).

Then, the management unit information transmission unit 152 transmits information (communication device ID, etc.) of one communication device that operates the transmission right management unit 149 determined by the transmission right management unit determination unit 154 to each communication through the coaxial transmission line 13. It transmits to the devices 111 to 11n.

  Note that the same method as that described in Embodiment 1 can be used as the method of inspecting the transmission line state performed by the transmission line state inspection unit 143.

  Further, in the error inspection control unit 43, the determination of the transmission path state performed by comparing the information transmission error value measured by the transmission error measuring unit 41 and the threshold value is performed by using an instantaneous information transmission error value. Alternatively, the determination may be made by accumulating information transmission error values. The transmission path state may be determined separately for transmission and reception, or may be determined together. And the threshold value which determines a transmission-line state should just set an appropriate value according to these determination methods. For example, the threshold value may be an instantaneous error value, an accumulated error value, or a transmission / reception threshold value may be provided separately.

  Also, here, when the transmission state between communication devices deteriorates and the transmission path state is inspected, the transmission line states between communication devices other than the deterioration of the transmission state are not checked. When the transmission state between devices deteriorates, it is judged that there is a problem in the transmission state between all communication devices, and the transmission path state between other communication devices other than the deteriorated transmission state is also checked. May be.

  As described above, in the coaxial transmission system according to the third embodiment, each communication apparatus measures an information transmission error value in communication with the communication apparatus in which the transmission right management unit operates, and the information transmission error Is compared with a transmission error threshold value set in advance, and when the transmission error value exceeds the threshold value, the transmission line state between the communication devices is inspected, and the inspection result is transmitted to the communication device. Is held and transmitted to the transmission right management unit determination device, and the transmission right management unit determination device performs communication with the best transmission path state with a communication apparatus other than the own communication apparatus based on the transmission path information between the communication apparatuses. By determining the device as one communication device that operates the transmission right management unit, the transmission quality between the transmission right management device and each communication device is improved, and the transmission right is efficiently allocated to the transmission request from each communication device. Between communication devices. Efficient communication can be performed.

  In the coaxial transmission systems of the first to third embodiments, the transmission right management unit determination device 12 is provided separately from the communication devices 111 to 11n. However, any one of the communication devices is a transmission right management unit determination device. It may be configured to serve as both.

(Embodiment 4)
FIG. 9 is a configuration block diagram of the coaxial transmission system according to the fourth embodiment of the present invention. In addition, the same number is attached | subjected to the part of the structure which has the same function as the coaxial transmission system of Embodiment 1 of this invention, and the description is abbreviate | omitted.

  The coaxial transmission system according to the fourth embodiment has a configuration that does not require a transmission right management unit determination device, and each of the communication devices 111 to 11n has a transmission path state in addition to the configuration of the communication device according to the first embodiment. The difference from the coaxial transmission system of the first embodiment is that a table creation unit 47 and a transmission right management unit determination unit 48 are provided.

  The transmission path state table creation unit 47 and the transmission right management unit determination unit 48 are respectively included in the transmission path state table creation unit 153 and the transmission right management included in the transmission right management unit determination apparatus 12 of the first embodiment shown in FIG. The same processing as that performed by the unit determination unit 154 is performed. That is, in the fourth embodiment, each of the communication devices 111 to 11n has the function of the transmission right management unit determining device 12 of the first embodiment.

  Here, the transmission right management unit determination unit 48 provided in each of the communication devices 111 to 11n determines one communication device that operates the transmission right management unit 149 based on the same determination criterion. Therefore, based on the same transmission path state table, one communication apparatus determined by any communication apparatus becomes the same communication apparatus.

  Next, an operation in each of the communication devices 111 to 11n when determining a communication device for operating the transmission right management unit 149 in the coaxial transmission system according to the fourth embodiment will be described.

  In the coaxial transmission system according to the fourth embodiment, the procedure for determining the communication device for operating the transmission right management unit 149 is the same as the procedure shown in FIG. 3 described in the first embodiment, and will be described with reference to FIG. To do.

  In the first embodiment, the transmission right management unit determining device 12 determines one communication device for operating the transmission right management unit 149, whereas in the case of the fourth embodiment, each communication device is determined. Each of 111-11n does.

  First, when the power of the communication devices 111 to 11n is supplied (S11), between each other communication device (or the communication devices 112 to 11n when the communication device to which the power is supplied is the communication device 111). The transmission path state is inspected (S12). Then, the result information of the transmission line state checked by the transmission line state inspection unit 143 is held in the transmission line state holding unit 145 (S13).

  Next, the transmission path state information generation unit 146 includes communication apparatus information 21 (communication apparatus ID or the like) indicating the communication apparatus inspected by the transmission path state inspection unit 143, and the transmission path held by the transmission path state holding unit 145. The transmission path state information as shown in FIG. 2 composed of the communication apparatus transmission path state information 22 based on the state result information is generated (S14).

  Then, when transmitting the transmission path state information generated by the transmission path state information generation unit 146 using the transmission unit 142 via the coaxial transmission path 13, the communication apparatus 112 To all communication devices of ~ 11n) (S15).

  And each communication apparatus 111-11n receives the transmission line state information transmitted from the other communication apparatuses 111-11n via the coaxial transmission line 13 using the receiving part 141. FIG. Then, the transmission path state table creation unit 47 creates a transmission path state table configured as shown in FIG. 4 (S16).

Then, the transmission right management unit determination unit 154 operates the transmission right management unit 149 for a communication device that determines that the transmission line state with the communication device other than the own communication device is the best based on the transmission line state table. The communication device is determined (S17). Here, the transmission right management unit determination unit 154 of each of the communication devices 111 to 11n determines one communication device that operates the transmission right management unit 149 based on the same determination criterion, and thus is the same in any communication device 111 to 11n. Is determined as one communication device. (In the case of FIG. 4, in any communication device, the communication device 112 is determined as one communication device that operates the transmission right management unit 149.)
Thereafter, the transmission right management unit 149 of the communication apparatus determined as the one communication apparatus that operates the transmission right management unit 149 operates, and the one communication apparatus performs time division transmission of the coaxial transmission system according to the fourth embodiment. Rights control will be performed.

  In the case of the first to third embodiments, the transmission right management unit determination device 12 transmits information of one communication device that operates the determined transmission right management unit 149 to each communication device. In form 4, since the same communication apparatus is determined as one communication apparatus by each communication apparatus 111-11n, it is not necessary to transmit the information of the determined one communication apparatus to another communication apparatus. Therefore, in the fourth embodiment, it is not necessary to provide the transmission right management unit determining device 12 as compared with the first to third embodiments, and the processing for determining the communication device that operates the transmission right management unit 149 is performed. Can be done quickly.

  In addition, although each embodiment demonstrated the coaxial transmission system, it is not restricted to the system connected with a coaxial cable. Any system that performs demand-assigned TDMA communication by wired connection can be applied to other systems. Therefore, for example, the transmission path may be an optical fiber.

  With the transmission system of the present invention, based on the transmission path information between the communication apparatuses, the communication apparatus having the best transmission path state with the communication apparatus other than the own communication apparatus is determined as the communication apparatus in which the transmission right management unit operates. As a result, the transmission quality between the communication device that operates the transmission right management unit and each communication device is improved, the transmission right is efficiently allocated to the transmission request from each communication device, and the transmission efficiency between the communication devices is high. Data communication is possible, and real-time communication such as VoIP can be realized.

  The program of the present invention includes a transmission unit, a reception unit, a transmission right management unit, a transmission path state inspection unit, a transmission path state holding unit, and a transmission path information transmission control unit of the communication device of the transmission system of the present invention described above. A program for causing a computer to execute functions, and a program that operates in cooperation with the computer.

  The recording medium of the present invention includes a transmission unit, a reception unit, a transmission right management unit, a transmission line state inspection unit, a transmission line state holding unit, and a transmission line information transmission control unit of the communication device of the transmission system of the present invention described above. This is a recording medium carrying a program for causing the computer to execute the above functions, and is a recording medium that can be read by the computer and used in cooperation with the computer.

  The program of the present invention executes the functions of the transmission path information receiving unit, the transmission right management unit determining unit, and the transmission right management unit information transmitting unit of the transmission right management unit determining apparatus of the transmission system of the present invention described above by a computer. A program that operates in cooperation with a computer.

  Further, the recording medium of the present invention provides the functions of the transmission path information receiving unit, transmission right management unit determining unit, and transmission right management unit information transmitting unit of the transmission right management unit determining apparatus of the transmission system of the present invention described above by a computer. A recording medium carrying a program to be executed, readable by a computer, and a recording medium in which the read program is used in cooperation with the computer.

  Further, one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

  Further, the recording medium includes a ROM and the like.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

  As described above, the configuration of the present invention may be realized by software or hardware.

  The transmission right management unit operates by determining the communication device with the best transmission line state with the communication device other than the own communication device as the communication device on which the transmission right management unit operates based on the transmission path information between the communication devices. Transmission quality between communication devices and each communication device is improved, transmission rights are efficiently allocated to transmission requests from each communication device, and data communication with high transmission efficiency is possible between communication devices. By providing a simple communication environment, it is possible to adapt to applications in which it is indispensable to efficiently transmit high-quality and large-capacity images such as high-quality images.

Configuration block diagram of coaxial transmission system according to Embodiment 1 of the present invention The figure which shows the structure of the transmission line state information of Embodiment 1 of this invention. The figure which shows the procedure which determines the communication apparatus with which the transmission right management part of Embodiment 1 and 4 of this invention operate | moves. The figure which shows the transmission-line state table between the communication apparatuses 111-114 of Embodiment 1 of this invention. Configuration block diagram of coaxial transmission system according to Embodiment 2 of the present invention The figure which shows the procedure which determines the communication apparatus with which the transmission right management part of Embodiment 2 of this invention operate | moves. Configuration block diagram of coaxial transmission system according to Embodiment 3 of the present invention The figure which shows the procedure which determines the communication apparatus with which the transmission right management part of Embodiment 3 of this invention operate | moves. Configuration block diagram of coaxial transmission system according to embodiment 4 of the present invention Configuration diagram of a communication system for performing conventional demand-assigned TDMA communication The figure which shows the time frame of the conventional example The figure which shows the structure of the transmission request information of a prior art example The figure which shows the structure of the allocation information of a prior art example

Explanation of symbols

111 to 11n, 511 to 51n Communication device 12 Transmission right management unit determining device 13, 53 Coaxial transmission path 141, 45 Receiving unit 142, 46 Transmission unit 143 Transmission path state inspection unit 144 Transmission path state inspection control unit 145 Transmission path state holding Unit 146 transmission path state information generation unit 151 transmission path information reception unit 152 management unit information transmission unit 153, 47 transmission path state table creation unit 154, 48 transmission right management unit determination unit 21 communication device information 22 inter-communication device transmission path state information 31 Transmission path state inspection time measurement section 41 Transmission error measurement section 42 Transmission path inspection threshold holding section 43 Error inspection control section 52 Transmission right control apparatus 61 Transmission request period 62 Transmission right notification period 63 Information transmission period 64 Assigned to communication apparatus 511 Information transmission period 71, 81 transmission destination information 72, between communication device 511 and communication device 512 2 source information 83 transmission period information

Claims (17)

A plurality of communication devices having a transmission right management unit that manages and assigns a transmission unit, a reception unit, and a time zone for transmitting and receiving signals between the communication devices;
Of the plurality of communication devices, a transmission right management unit determination device that determines one communication device that operates the transmission right management unit;
A transmission path for communicating each of the plurality of communication devices and the transmission right management unit determination device,
Each of the plurality of communication devices is
A transmission line state inspection unit that inspects a transmission line state between each of the other communication devices using the transmission unit and the reception unit;
A transmission line state holding unit for holding a transmission line state inspection result inspected by the transmission line state inspection unit;
A transmission path information transmission control unit that transmits the transmission path state inspection result to the transmission right management unit determination apparatus using the transmission unit;
The transmission right management unit determination device includes:
A transmission path information receiving unit that receives a transmission path state inspection result from each of the plurality of communication devices;
A transmission right management unit determining unit that determines the one communication device that operates the transmission right management unit based on the transmission path state inspection result;
A transmission system comprising: a transmission right management unit information transmitting unit configured to transmit information of the determined one communication device to all communication devices. When the transmission path information transmission control unit transmits the transmission path state inspection result to the transmission right management unit determination device, the transmission channel information transmission control unit is also transmitted to another communication device.
The transmission right management unit of the determined one communication device allocates a time zone for transmitting and receiving a signal between the communication devices using a transmission path state inspection result received from each communication device. Transmission system. The transmission right management unit information transmission unit transmits a transmission path state inspection result received from each of the plurality of communication devices to the determined one communication device,
The transmission right management unit of the determined one communication device uses the transmission path state inspection result received from the transmission right management unit information transmission unit, and assigns a time zone for transmitting and receiving signals between the communication devices. The transmission system according to claim 1.   The transmission system according to claim 1, wherein any one of the plurality of communication devices also serves as the transmission right management unit determination device. When power is supplied to the communication device,
The transmission line state inspection unit inspects the transmission line state,
The transmission path information transmission control unit transmits the transmission path state inspection result to the transmission right management unit determination device,
The transmission system according to claim 1, wherein the transmission right management unit determination unit re-determines the one communication device that operates the transmission right management unit. The transmission line state inspection unit inspects the transmission line state every predetermined time,
The transmission path information transmission control unit then transmits the transmission path state inspection result to the transmission right management unit determination device,
The transmission system according to claim 1, wherein the transmission right management unit determination unit re-determines the one communication device that operates the transmission right management unit. Each of the plurality of communication devices further includes a transmission error measurement unit that measures a transmission error amount during information transmission with another communication device,
The transmission path state inspection unit inspects the transmission path state when a transmission error amount with a communication apparatus in which the transmission right management unit is operating exceeds a preset transmission error amount,
The transmission path information transmission control unit transmits the transmission path state inspection result to the transmission right management unit determination device,
The transmission system according to claim 1, wherein the transmission right management unit determination unit re-determines the one communication device that operates the transmission right management unit. The transmission path state between each of the other communication devices is a communication speed with each of the other communication devices,
The transmission right management unit determination unit determines the communication device having the largest total communication speed with each other communication device as the one communication device that operates the transmission right management unit. The transmission system according to 1. The transmission path state between each of the other communication devices is a communication speed with each of the other communication devices,
The transmission right management unit determination unit compares the slowest communication speeds among the communication speeds between the respective communication devices and the communication device having the largest value of the slowest communication speed. The transmission system according to claim 1, wherein the transmission right management unit is determined to be the one communication device that operates the transmission right management unit. A plurality of communication devices having a transmission right management unit that manages and assigns a transmission unit, a reception unit, and a time zone for transmitting and receiving signals between the communication devices;
A transmission path for communicating each of the plurality of communication devices with each other,
Each of the plurality of communication devices is
A transmission line state inspection unit that inspects a transmission line state between each of the other communication devices using the transmission unit and the reception unit;
A transmission line state holding unit for holding a transmission line state inspection result inspected by the transmission line state inspection unit;
The transmission path state inspection result is transmitted to all other communication devices using the transmission section, a transmission path information transmission control section,
From each of all other communication devices, a transmission path information acquisition unit that acquires a transmission path state inspection result using the reception unit;
A transmission right management unit determining unit that determines which transmission right management unit of any communication device operates based on the acquired transmission path state inspection result on the same basis in any communication device. system. Each of a plurality of communication devices connected to the transmission path inspects the transmission path status with other communication apparatuses;
Each of the plurality of communication devices transmits a transmission path state inspection result obtained by inspecting the transmission path state to a transmission right management unit determination apparatus connected to the transmission path;
The transmission right management unit determination device allocates a time zone for transmitting and receiving signals between the communication devices out of the plurality of communication devices, based on the transmission path state inspection result received from each of the plurality of communication devices. Determining one communication device to be performed;
A transmission control method for a transmission system, comprising: a step in which the transmission right management unit determination apparatus transmits information of the determined one communication apparatus to all communication apparatuses.   The communication apparatus of the transmission system according to claim 1.   The transmission right management part determination apparatus of the transmission system of Claim 1. The communication device of the transmission system according to claim 1.
The transmitter,
The receiver,
The transmission right management unit that manages and assigns time zones for transmitting and receiving signals between the communication devices,
The transmission path state inspection unit that inspects the transmission path state between each other communication device,
The transmission line state holding unit for holding the transmission line state inspection result inspected by the transmission line state inspection unit,
A program for causing a computer to function as the transmission path information transmission control unit that transmits the transmission path state inspection result to the transmission right management unit determining apparatus.   15. A recording medium carrying the program according to claim 14 and usable by a computer. The transmission right management unit determining device of the transmission system according to claim 1,
The transmission path information receiving unit that receives a transmission path state inspection result from each of the plurality of communication devices,
The transmission right management unit determining unit that determines the one communication device that operates the transmission right management unit based on the transmission path state inspection result;
A program for causing a computer to function as the transmission right management unit information transmission unit that transmits information of the determined one communication device to all communication devices.   A recording medium carrying the program according to claim 16, which can be used by a computer.

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