JP2014150460A - Half-duplex communication network, and data communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress decrease in data arrival rate by managing communications even when the amount of traffic in a communication network increases.SOLUTION: There is provided a half-duplex communication network comprising: a host device; a plurality of terminal devices under control of the host device; and a circuit control device configured to set a circuit between the host device and the terminal device. When data communications are performed between the host device and the terminal device, the circuit control device creates a communication plan for performing data communications, and notifies at least the terminal device of the communication plan, and the host device and the terminal device perform data communications in accordance with the communication plan.

Description

  The present invention relates to a half-duplex communication network in which voice communication and data communication are performed, and a data communication method.

  There is a data communication method (media access control method) for realizing a half-duplex communication network in which voice communication and data communication are performed. However, since voice communication has a higher priority than data communication, there is an inconvenience that data communication fails when a collision between voice communication and data communication occurs.

  Japanese Patent Application Laid-Open No. 2008-113379 discloses a communication control device that avoids such communication collision. This communication control device includes an adapter and a signal control unit so that a plurality of communication terminals that perform half-duplex communication and a voice automatic response device that outputs voice data perform half-duplex communication. The data storage unit of the adapter stores the voice data when the voice data is input from the voice automatic response device, and the signal control unit communicates with the communication terminal according to the voice data input from the voice automatic response device. The data transmission right acquisition request for transmitting the voice data is made, and when the data transmission right acquisition notification is received, the voice data stored in the data storage unit is transmitted.

JP 2008-113379 A

  However, in the configuration according to Japanese Patent Application Laid-Open No. 2008-113379, since the data transmission right is acquired for each communication terminal, voice transmission from other communication terminals may occur during transmission of data communication. In such a case, since voice communication is given priority, data communication fails. That is, the configuration according to Japanese Patent Application Laid-Open No. 2008-113379 has a problem that the data arrival rate is remarkably lowered when the traffic of the communication network increases.

  Therefore, a main object of the present invention is to provide a half-duplex communication network and a data communication method that manage communication to suppress a decrease in data arrival rate even if the traffic of the communication network increases.

  In order to solve the above problems, an invention relating to a half-duplex communication network in which voice communication and data communication are performed includes a host system device, a plurality of terminal devices under the host system device, a host system device, and a terminal device. A line control device for setting the communication line, and when data communication is performed between the host system device and the terminal device, the line control device creates a communication plan for performing data communication, and The plan is notified to at least the host system device and the terminal device, and the host system device and the terminal device perform data communication according to the communication plan.

  The invention relating to a data communication method in a half-duplex communication network in which voice communication and data communication are performed includes: a line control procedure for setting a line between a higher-level device and a terminal device; and a higher-level device and a terminal device. Communication plan creation procedure for creating a communication plan for performing data communication when data communication is performed between them, a notification procedure for notifying the communication plan to at least the host system device and the terminal device, host system device and terminal The apparatus includes a communication procedure for performing data communication according to the communication plan.

  According to the present invention, since a communication plan is created and data communication is performed based on this communication plan, it is possible to suppress a decrease in the data arrival rate even if the traffic of the communication network increases.

1 is a block diagram of a communication network system according to the present invention. It is a figure which shows the procedure which registers the positional information on the target terminal device to an area registration server. It is a figure which shows the operation | movement procedure with a high-order apparatus and a terminal device. It is a figure which shows an example of the communication plan at the time of a data communication start. It is a figure which shows an example of the communication timing at the time of data communication start. It is a figure which shows an example of the communication timing by the voice communication start during data communication. It is a figure which shows an example of the communication plan at the time of data communication resumption. It is a figure which shows an example of the communication timing at the time of data communication resumption.

  An embodiment of the present invention will be described. FIG. 1 is a block diagram of a half-duplex communication network system 2 according to the present invention. The half-duplex communication network 2 includes a radio network controller 11, a terminal device 12 (12aa to 12bb), an area registration server 14, a base station radio device 15 (15a and 15b), a mobile station 16 (16aa to 16bb), and an upper system. A device 18 and a communication network 19 (19a, 19b) are included.

  In FIG. 1, the base station radio device 15 and the communication network 19 subordinate to the radio network controller are exemplified as two cases, and two mobile stations 16 and terminal devices 12 are connected to each communication network 19. Although cases are illustrated, it is added in advance that the present invention is not limited to such numbers.

  In the case of downlink communication (communication from the host system apparatus 18 to the terminal apparatus 12), the radio network controller 11 selects the base station radio apparatus 15 corresponding to the terminal apparatus 12, and the host system apparatus 18 transfers to the terminal apparatus 12. Line control is performed so that voice or data can be transmitted.

  Further, in the case of uplink communication (communication from the terminal device 12 to the higher system device 18), the radio network controller 11 receives the voice or data received from the terminal device 12 via the base station radio device 15 as the upper system device 18. Line control is performed so that data can be transmitted to the network.

  In the case of performing downlink data communication, the radio network controller 11 temporarily stores the data in the transmission queue even if there is a data communication request from the host system device 18, and after confirming the end of the voice communication, Communicate.

  The host system device 18 performs voice or data communication with the terminal device 12 via the wireless line control device 11. The terminal device 12 performs voice or data communication with the host system device 18 via the mobile station 16 or the like.

  As shown in FIG. 2, each time the upstream communication is started in the communication between the host system device 18 and the terminal device 12, the area registration server 14 sends a communication type to the area registration server 14. (Speech communication / data communication, etc.), information of the transmission source (terminal device 12), the receiving base station such as the base station wireless device 15 to be relayed is registered. FIG. 2 is a diagram illustrating a procedure for registering position information of the target terminal device 12 in the area registration server 14.

  The base station wireless device 15 converts the communication method between the wireless line control device 11 and the communication network 19. The mobile station 16 transmits / receives voice or data of the terminal device 12 to / from the communication network 19.

  Next, a communication procedure between the host system device 18 and the terminal device 12 shown in FIG. 3 will be described. In FIG. 3, mobile stations 16aa and 16ab and terminal devices 12aa and 12ab under the communication network 19a are taken as an example.

  Phase 1, 2: The radio network controller 11 controls the line so that the terminal apparatus 12aa can make a voice call with the host system apparatus 18 via the mobile station 16a and the base station radio apparatus 15a. Further, the terminal apparatus 12ba performs line control so that voice communication can be performed with the host system apparatus 18 via the mobile station 16b and the base station radio apparatus 15b.

  Phase 3, 4: When detecting the end of voice communication, the radio network controller 11 inquires the area registration server 14 about the presence or absence of the terminal device 12 that performs data communication. In the area registration server 14, the position information is registered as described with reference to FIG. In response to this inquiry, the area registration server 14 returns information (the presence / absence of data communication, address, etc.) of the terminal device 12 that performs data communication to the radio network controller 11.

  Phase 5: Next, the radio network controller 11 determines whether or not there is data (the number of untransmitted data) stored in the transmission queue for downlink communication at this time, and a terminal device that performs data communication obtained from the area registration server 14 A communication plan related to data communication is created from the presence / absence information of the twelve. At this time, a communication plan is created for each of the communication networks 19a and 19b.

  Phase 6: The radio network controller 11 notifies the terminal device 12 of the created communication plan. Then, the radio network controller 11 and the terminal device 12 execute data communication while performing time synchronization based on the communication plan. In the following description, the timing at which data communication can be performed is described as a slot.

  If the voice communication is not started even after the data communication based on the communication plan is completed, the radio network controller 11 creates a communication plan again and notifies the terminal device 12 to perform the data communication based on the new communication plan.

  This communication plan will be described with reference to FIGS. FIG. 4 is a diagram illustrating an example of a communication plan at the start of data communication. FIG. 5 is a diagram illustrating an example of communication timing at the start of data communication.

  The communication plan includes elements of “message No.”, “data communication restart flag”, “number of downlink slots”, “number of uplink allocation slots”, “designated transmission source”, and “number of uplink free slots”.

  This “message No” indicates the number of the communication plan, and is set to a value incremented by 1 each time the communication plan is transmitted.

  The “data communication resume flag” is normally set to “0”, but when the data communication is resumed after the data communication is interrupted, the number of the communication plan that planned the interrupted data communication is set. The For example, in the case of a communication plan with message No. 2, “2” is set. The resumption of data communication is resumed from the communication with the interrupted terminal device 12, and the terminal device for which transmission has been completed is excluded. Note that “message No” is not incremented when communication is resumed.

  The “number of downlink slots” indicates the number of slots that can be transmitted by the host system device 18 and is set according to a table set in advance based on the number of untransmitted data and the like that the host system device 18 has.

  Communication data transmitted from the host system device 18 to the terminal device 12 is stored in the radio network controller 11. The area registration server 14 is registered with the location information of the terminal device 12 that has performed data communication. Therefore, the radio network controller 11 sets the number of slots required when transmitting the stored communication data based on the position information as the number of downlink slots.

The “uplink allocation slot number” sets the number of slots that can be transmitted by the terminal apparatus 12 designated as the “designated transmission source”, for example, according to the following setting rules 1 to 3.
(Setting rule 1): The radio network controller 11 acquires the number of terminal devices 12 that have performed data communication from the area registration server 14, and sets the number of uplink allocation slots.
(Setting rule 2): When there is a terminal device 12 (hereinafter referred to as a dedicated terminal device) that needs to guarantee a certain throughput, the number of slots required for the terminal device 12 is set. An example of the dedicated terminal device is a terminal device that needs to periodically notify the position of the own device. At this time, it is preferable to provide a priority for data communication between the dedicated terminal device and the other terminal devices (hereinafter referred to as primary terminal devices).
(Setting rule 3): The number of slots corresponding to the number of terminal devices 12 that make an acknowledgment when the data that uses the downlink slot needs an acknowledgment (ACK: ACKnowledgement) from the terminal device 12 that received the data Set.

The “designated transmission source” is an address or the like that specifies the terminal device 12 that can use the uplink allocation slot. The “number of uplink free slots” is set by calculating the number of slots that can be freely used by the terminal device 12 according to the following Equation 1.
“Number of uplink free slots” = “number of uplink slots” − “number of uplink allocation slots” (1)
Here, the “number of uplink slots” is determined and set based on the number of terminal apparatuses 12 that perform data communication participating in the communication network 19 (collected by the radio network controller 11 from the area registration server 14).

  FIG. 5 shows that there are four uplink slots and two of them are allocated as uplink allocation slots.

  Next, a procedure for resuming data communication when the data communication is interrupted by voice communication will be described with reference to FIGS.

  FIG. 6 is a diagram illustrating an example of communication timing due to the start of voice communication during data communication. FIG. 7 is a diagram illustrating an example of a communication plan when data communication is resumed. FIG. 8 is a diagram illustrating an example of communication timing when data communication is resumed.

  As shown in FIG. 6, when the uplink data communication fails because the voice communication is started and a collision with the voice communication occurs during the uplink data communication, the data communication restart operation is performed. Note that the data communication resumption procedure in FIGS. 6 to 8 is an example in which the communication plan shown in FIG. 4 is resumed due to failure of uplink data communication.

  When detecting a collision with voice communication, the radio network controller 11 creates a communication plan as shown in FIG. 7 after the voice communication ends. This communication plan is a plan from an uplink communication slot in which data communication has failed due to the start of voice communication. That is, the number of uplink allocation slots in FIG. However, since the voice communication is started for the second time of the communication data, the remaining communication data is one time to be transmitted to the terminal device 12ab (the number of uplink allocation slots is 1). Then, according to this communication plan, the radio network controller 11 resumes data communication at the transmission timing as shown in FIG.

  As described above, the radio network controller prepares a communication plan in advance prior to data communication, notifies the host system device and terminal device, and performs data communication based on this communication plan. Even if the number increases, communication collision (downlink communication and uplink communication collision) can be reduced.

  In addition, when the data communication is resumed, the radio network controller creates and notifies a communication plan from the slot in which the data communication has failed due to the voice communication, so that the data arrival rate decreases due to the failure of the data communication by the voice communication. Can be prevented.

2 Half-duplex communication network system 11 Radio network controller 12 (12aa to 12bb) Terminal device 14 Area registration server 15 (15a, 15b) Base station radio device 16 (16a, 16b) Mobile station 18 Host system device 19 (19a, 19b) Communication network

Claims (8)

In a half-duplex communication network where voice communication and data communication are performed,
A host system,
A plurality of terminal devices under the host system device;
A line control device for setting a line between the host system device and the terminal device,
When data communication is performed between the host system device and the terminal device, the line control device creates a communication plan for performing data communication, and notifies the communication plan to at least the terminal device. The half-duplex communication network, wherein the terminal device performs data communication according to the communication plan. A half-duplex communication network according to claim 1,
An area registration server for registering position information of the terminal device;
The line control device creates the communication plan based on at least the position information. A half-duplex communication network according to claim 2,
The line control device is for resuming data communication from the failed terminal device when voice communication is performed and the data communication fails during data communication according to the communication plan. A half-duplex communication network, wherein the communication plan is created and notified. A half-duplex communication network according to any one of claims 1 to 3,
The half-duplex communication network characterized in that the communication plan includes timing of data communication that can be arbitrarily used by the terminal device. In a data communication method in a half-duplex communication network in which voice communication and data communication are performed,
A line control procedure for setting a line between the host system device and the terminal device;
A communication plan creation procedure for creating a communication plan for performing data communication when data communication is performed between the host system device and the terminal device;
A notification procedure for notifying at least the terminal device of the communication plan;
A data communication method in a half-duplex communication network, comprising: a communication procedure in which the host system device and the terminal device perform data communication according to the communication plan. A data communication method in a half-duplex communication network according to claim 5,
A data communication method in a half-duplex communication network, comprising an area registration procedure for registering position information of the terminal device, and creating the communication plan based on at least the position information. A data communication method in a half-duplex communication network according to claim 6,
In the middle of performing data communication according to the communication plan, when the voice communication is performed and the data communication fails, the communication plan for resuming data communication from the failed terminal device is created. A data communication method in a half-duplex communication network, comprising: A data communication method in a half-duplex communication network according to any one of claims 5 to 7,
A data communication method in a half-duplex communication network, including a timing of data communication that can be arbitrarily used by the terminal device when creating the communication plan.

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