JP5351834B2 - Communication apparatus and operation method thereof - Google Patents

Description

  The present invention relates to a communication apparatus and an operation method thereof for enabling early communication with high priority.

  In recent years, there has been an increase in services that realize short-range wireless communication or electric field communication using embedded devices using IC chips. For example, NFC, Bluetooth, IrDA, etc. in mobile phones, and related technology is also disclosed in Patent Document 1.

  As a method of interrupting high priority communication to a communication device in communication with a plurality of communication devices, in the wireless or wired system, a method of reserving a part of a frequency band or a method of performing an interrupt using a time slot (Patent Document 2 etc.).

  In embedded short-distance wireless communication or electric field communication, there are restrictions on resources, functions, and performance due to power saving, downsizing, and cost support, and there are fewer communication devices to deal with than mobile phones and wired LANs. In some cases, it is unavoidable to fix the frequency band for communication.

  In this case, in the access control method of CSMA / CA, when interference occurs (when ACK is not returned), polling is performed while waiting for a time that is a combination of an IFS (interframe space) time and a backoff time as a polling interval. The backoff time is determined by random numbers.

  An interrupt signal from a communication device with a high priority needs to be transmitted after the communication of the communication device with a low priority is completed in order to prevent a collision. Therefore, a communication device with a high priority cannot be connected immediately.

  Interference may occur when a communication device with a high priority sends an interrupt signal to a communication device with a low priority during communication because it is immediately connected, but even if the priority is high, the priority is not necessarily low. Since there is no possibility of being able to connect before other communication devices, there is a possibility that useless retransmission may occur. When the polling interval is longer than the session re-establishment time, there is a problem that interference occurs continuously and interruption cannot be performed.

  FIG. 6 is a sequence diagram in the case where interference occurs continuously in this way.

  The communication device X transmits a polling message to the communication device Y (K1), and the communication device Y transmits a communicable response (ACK) to the communication device X (K3). The communication devices X and Y perform session establishment processing (K5).

  If the communication device Z transmits a polling message to the communication device Y in the middle of the session establishment process (K11), interference occurs in the communication medium between the communication devices because the session establishment process is in progress (K13). Thereby, the session establishment process by the communication apparatuses X and Y is interrupted.

  For example, the communication device X transmits a polling message again after a certain polling time interval elapses, whereby the communication devices X and Y perform session establishment processing again (K21).

  For example, when the communication device Z transmits a polling message again after a certain polling time interval elapses (K21), the communication devices X and Y are performing session establishment processing, so that interference occurs again in the communication medium. (K33). Thereby, the session establishment process by the communication apparatuses X and Y is interrupted.

  Thereafter, similar interference continues. Therefore, even if the priority of the communication to be performed by the communication device Z is high, this communication cannot be executed early.

JP 2000-341762 A JP 2001-53745 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication apparatus and an operation method thereof for enabling early communication with high priority.

In order to solve the above-described problem, the first aspect of the present invention is a communication device, wherein the higher the priority is, the shorter the polling is associated with the priority of the service provided by the communication to be performed by the communication device. A polling time interval storage means for storing a time interval, and a polling message sent from the communication device for polling without a predetermined response and when the polling message is sent, the polling time interval storage means Polling time interval elapsed determination means for determining whether or not the polling time interval stored in association with the priority of the service provided by the communication started by the polling message has elapsed, and the polling time interval has elapsed a polling message transmission control means for transmitting the polling message if is determined that the communication device Waiting necessity storage means for storing whether or not it is necessary to wait for a certain period of time before transmission of a polling message transmitted from the communication device in association with the type of service provided by the communication to be performed, and the communication device Whether or not it is stored that it is necessary to wait for a certain period of time in correspondence with the type of service provided by the communication started by the polling message in the waiting necessity storage unit before transmission of the polling message transmitted from A waiting necessity determination means for determining whether or not the polling message transmission control means waits for a certain period of time when it is determined that the waiting for a certain period of time is stored, and transmits the polling message On the other hand, if it is determined that it is not stored that it is necessary to wait for the predetermined period, the polling message is not And wherein the signal to Rukoto.

The second aspect of the present invention is an operation method of a communication apparatus, wherein the communication apparatus is associated with a priority of a service provided by communication to be performed by the communication apparatus, and the polling time is shorter as the priority is higher. Whether it is necessary to wait for a certain period of time before transmitting a polling message transmitted from the communication device in association with a polling time interval storage means for storing the interval and the type of service provided by the communication to be performed by the communication device Standby communication necessity storage means for storing whether or not the communication device operates according to the polling message of the standby necessity storage means before the communication device transmits the polling message transmitted from the communication device. Determining whether it is stored whether it is necessary to wait for a certain period of time in association with the type of service provided by the communication started by When it is determined that it is stored that the communication apparatus needs to wait for the certain period, the communication apparatus waits for a certain period and transmits the polling message, or the communication apparatus needs to wait for the certain period If it is determined that there is not stored, the step of transmitting the polling message without waiting for a certain period of time, and the communication device does not have a predetermined response to the polling message and the polling message is Determining whether or not the polling time interval stored in association with the priority of the service provided by the communication started by the polling message of the polling time interval storage means has elapsed since being transmitted; When the communication device determines that the polling time interval has elapsed, the standby necessity storage means Determining whether or not it is stored that it is necessary to wait for a certain period of time in association with the type of service provided by communication initiated by the polling message, and the communication apparatus waits for the certain period of time When it is determined that the necessity is stored, it waits for a certain period and transmits the polling message, or it is determined that it is not stored that the communication apparatus needs to wait for the certain period And a step of transmitting the polling message without waiting for a certain period of time.

  According to the present invention, there is no predetermined response to the polling message transmitted from the communication apparatus, and the communication is started by the communication started by the polling message in the polling time interval storage means from when the polling message is transmitted. It is determined whether or not the polling time interval stored in association with the priority of the service has elapsed, and if it is determined that the polling time interval has elapsed, the polling message is transmitted, so early communication with high priority Can be done.

It is a block diagram of each communication apparatus included in the communication system according to the present embodiment. It is a figure which shows the structure and content example of the polling setting file 131 classified by service. It is a flowchart which shows the operation | movement at the time of the message transmission in a communication apparatus. It is a flowchart which shows the operation | movement at the time of the message reception in a communication apparatus. It is a sequence diagram which shows operation | movement of a communication system. It is a sequence diagram which shows an example of the communication between the conventional communication apparatuses.

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

  FIG. 1 is a configuration diagram of each communication device included in the communication system according to the present embodiment.

  Each communication device 1 included in the communication system includes a communication unit 11, a control unit 12, and a storage unit 13.

  The communication unit 11 processes the data received from the control unit 12 into a message according to a predetermined protocol communicable with another communication device 1 and sends the data to the communication medium, while the message received from the communication medium is transmitted to the control unit 12. Is processed into understandable data and sent to the control unit 12.

  The control unit 12 includes at least one of a service providing unit 121 and a service receiving unit 122. The control unit 12 generates data to be given to the communication unit 11, stores data received from the communication unit 11, writes and reads data in the storage unit 13, executes data, discards data, and controls modules (for example, Operating system).

  The storage unit 13 is a storage area (for example, a memory) that can read and write data according to instructions from the control unit 12.

  The service providing unit 121 is a module (for example, an application server) that provides services to other communication devices.

  The service receiving unit 122 is a module (for example, a client) that receives a service from another communication device.

  The storage unit 13 includes a service-specific polling setting file 131 and a polling setting file 132.

  FIG. 2 is a diagram showing a configuration and example contents of the service-specific polling setting file 131.

  The service-specific polling setting file 131 has polling setting information for each of a plurality of services. Each polling setting information includes identification information (service ID) indicating the service, a priority of the service, and a polling message transmitted when communication for providing the service is started (hereinafter referred to as a polling message). And a flag indicating whether or not it is necessary to wait for a certain period before transmitting the polling message.

  The service-specific polling setting file 131 shown in FIG. 6 is (1) a ticket gate service (when the user tries to enter a train station with the communication device 1, the ticket gate is automatically set by communication with another communication device provided in the ticket gate. A service ID indicating a service that can pass through), a highest priority “high”, a polling time interval “50 milliseconds (mS)”, and a flag “that indicates that it is not necessary to wait for a certain period before sending a polling message” Polling setting information including “×”, and (2) business card exchange service (communication between the communication device 1 possessed by a businessman and the communication device possessed by another businessman automatically exchanges information as described on the business card) Service ID indicating a service that can be performed), second highest priority “medium”, polling time interval “100 milliseconds (mS)”, and waiting for a certain period of time before sending a polling message. Polling setting information including a flag “◯” indicating that it is necessary to perform, and (3) a service ID indicating a music distribution service (a service in which music is distributed from another communication device to the communication device 1), the lowest priority Degree “low”, polling time interval “200 milliseconds (mS)”, and polling setting information including a flag “◯” indicating that it is necessary to wait for a certain period of time before transmitting a polling message.

  Returning to FIG. 1, the polling setting file 132 is a file that temporarily stores the polling time interval in the polling setting information selected from the service-specific polling setting file 131 of FIG.

(Operation in this embodiment)
FIG. 3 is a flowchart showing an operation at the time of polling message transmission in the communication device 1.

  If the control unit 12 acquires the content to be transmitted to another communication device from the service providing unit 121 or the service receiving unit 122, the control unit 12 generates data of the content and is provided by the data from the service-specific polling setting file 131. The polling setting information including the service ID of the service is searched, the polling time interval is read from the polling setting information, and written in the polling setting file 132 (S1).

  Next, the control unit 12 gives the data to the communication unit 11 and processes the data into a polling message (hereinafter simply referred to as a polling message) (S3). For example, the control unit 12 reads the priority from the retrieved polling setting information, instructs the communication unit 11 to include the priority in the polling message.

  Next, the control unit 12 determines whether the flag in the polling setting information searched in S1 is the flag “◯” or the flag “×” (S5). If the flag in the polling setting information is “◯”, the control unit 12 does not communicate with the communication medium for transmitting the polling message of the generated data to another communication device through the communication unit 11 and also causes interference. It confirms that there is not, and waits for a fixed period (S7). This confirmation is performed by CSMA / CD or CSMA / CA, for example.

  Next, when the flag in the polling setting information is the flag “x” or when S7 is finished, the control unit 12 instructs the communication unit 11 to transmit a polling message (S9).

  Next, the control unit 12 determines whether or not a communicable response (ACK) notifying that communication is possible is transmitted from the partner communication device to the polling message via the communication unit 11 (S11).

  If it is determined that the communicable response (ACK) has not been transmitted, the control unit 12 determines whether or not the standby response (NACK) notifying that the other communication device should wait is transmitted via the communication unit 11. Determine (S13).

  If it is determined that the standby response (NACK) has not been transmitted, the control unit 12 determines whether or not the polling time interval of the polling setting file 132 has elapsed since the polling message was transmitted (timing of S9). (S15). If it is determined that the polling time interval has not elapsed, the control unit 12 returns to step S11.

  If it is determined that the polling time interval has elapsed, the control unit 12 counts the number of transmissions of the polling message (S17), and determines whether the counted number of transmissions has reached a predetermined maximum number (S19). . If it is determined that the number of transmissions has not reached the maximum number, the control unit 12 returns to step S5.

  If the control unit 12 determines in step S13 that a standby response (NACK) has been transmitted, the control unit 12 waits for a certain period (S21) and returns to step S5.

  If it is determined in step S11 that a communicable response (ACK) has been transmitted, the control unit 12 performs session establishment processing with the partner communication device (S31), and shifts to a connected state (S33).

  Next, the control unit 12 determines through the communication unit 11 whether there is interference (such as a polling message from a third party communication device) in the communication medium with the partner communication device (S35).

  If it is determined that there is interference in the communication medium, the control unit 12 returns to step S5. If it is determined that there is no interference in the communication medium, the control unit 12 determines whether or not the session is timed out (S37). If the session is not timed out, the controller 12 communicates with the other communication device (S39).

  If the communication with the counterpart communication device has not ended (S41: NO), the control unit 12 returns to S35.

  If the communication with the other communication device is completed (S41: YES), if the session is timed out, or if it is determined in step S19 that the number of transmissions has reached the maximum number, the control unit 12 ends the process.

  FIG. 4 is a flowchart showing an operation when receiving a polling message in the communication apparatus 1. Here, the other communication devices operate as described with reference to FIG. 3, and the polling message from the other communication devices includes the priority as described in the step S3.

  The control unit 12 determines whether or not a polling message has been transmitted from another communication device via the communication unit 11 (S51).

  Next, if it is determined that the polling message has been transmitted, the control unit 12 determines whether or not the polling message is also transmitted from another communication device (S53).

  If it is determined that a polling message is transmitted from another communication device, the control unit 12 refers to the priority of each polling message and selects the polling message with the highest priority (S55). To the communication apparatus that has transmitted the selected polling message (S57). Further, the control unit 12 instructs the communication unit 11 to transmit a standby response (NACK) to the communication device that transmitted the polling message that was not selected (S59).

  If it is determined in step 53 that the polling message has not been transmitted from another communication device, the control unit 12 instructs the communication unit 11 to transmit a communicable response (ACK) to the communication device that has transmitted the polling message. (S61).

  After step S59 or S61, the control unit 12 performs a session establishment process with the partner communication device that is the transmission destination of the communicable response (ACK) (S63).

  Next, the control unit 12 determines through the communication unit 11 whether or not there is interference (such as a polling message from a third party communication device) in the communication medium with the partner communication device (S65).

  If it is determined that there is interference in the communication medium, the control unit 12 returns to step S51. If it is determined that there is no interference in the communication medium, the control unit 12 determines whether or not the session is timed out (S67).

  If the session time-out occurs, the control unit 12 returns to step S51. If the session time-out does not occur, the control unit 12 communicates with the other communication device (S69).

  If the communication with the partner communication device is not finished (S71: NO), the control unit 12 returns to S65, and if the communication with the partner communication device is finished (S71: YES), the control unit 12 finishes the process.

  FIG. 5 is a diagram illustrating operations of three communication devices 1 (referred to as communication devices A, B, and C, respectively) included in the communication system according to the present embodiment.

  The communication device A transmits a polling message to the communication device B (T1), and the communication device B transmits a communicable response (ACK) to the communication device A (T3). The communication devices A and B perform session establishment processing (T5).

  Here, when the communication device C transmits a polling message to the communication device B (T11), since the communication devices A and B are performing session establishment processing, interference occurs in the communication medium (T13). Thereby, the session establishment process by the communication devices A and B is interrupted, and the communication devices A and C transmit a polling message after the polling time interval has elapsed (T21, T23). For example, if the priority of the service related to the polling message transmitted by the communication device A is “medium” while the priority of the service related to the polling message transmitted from the communication device C is “high”, the communication device C The polling message transmission interval is short, and the polling message transmission interval from the communication device A is long. Therefore, for example, the polling message from the communication device C is transmitted earlier than the polling message from the communication device A (T23).

  As a result, the communication device B transmits a communicable response (ACK) to the communication device C (T25), and transmits a standby response (NACK) to the communication device A (T27).

  Then, for example, until the next polling message is transmitted from the communication device A, the communication devices B and C can perform session establishment processing (T29).

  That is, since the transmission interval of the polling message from the communication device A is long, the possibility that the polling message is transmitted from the communication device A during the session establishment process between the communication devices B and C is low. Communication between C, that is, communication with high priority can be executed at an early stage.

  As described above, the communication device 1 according to the present embodiment stores the polling time interval that is shorter as the priority is higher in association with the priority of the service provided by the communication that the communication device 1 is to perform. The polling setting file 131 for each service, which is a time interval storage unit, and the polling message of the polling time interval storage unit from when the polling message transmitted from the communication apparatus 1 does not have a predetermined response. Polling time interval elapse determining means (step S15) for determining whether or not the polling time interval stored in association with the priority of the service provided by the communication started by the elapse of time and the polling time interval elapses. If it is determined, a polling message transmission control unit that transmits the polling message Since a control unit 12 is (step S9), and it is possible to perform high-priority communications early.

  Whether the polling setting file 131 for each service needs to wait for a certain period of time before transmitting a polling message transmitted from the communication device in association with the type of service provided by the communication that the communication device 1 intends to perform. The control unit 12 is a service provided by communication started by the polling message in the waiting necessity storage unit before the polling message transmitted from the communication device 1 is transmitted. It is also a standby necessity determination unit (step S5) for determining whether or not it is stored that it is necessary to wait for a certain period of time in association with the type of the polling message transmission control unit (step S9), that is, the control unit 12 If it is determined that it is stored that it is necessary to wait for a certain period, the process waits for a certain period (S7), and the polling message Transmit (S9) On the other hand, if it is determined that it is not stored that it is necessary to wait for a certain period, the polling message is transmitted without waiting for a certain period (S9). If you do not remember that it is necessary to wait for a certain period of time in correspondence, you do not wait for a certain period before sending a polling message for the service you want to execute at an early stage. Communication can be executed early.

  Further, since the communication device 1 that receives the polling message communicates with the counterpart communication device that has transmitted the polling message with the highest priority included in the polling message from the plurality of polling messages, High communication can be performed early.

  A computer program for causing a computer to function as the communication apparatus according to the present embodiment can be recorded on a computer-readable recording medium such as a semiconductor memory, a magnetic disk, an optical disk, a magneto-optical disk, a magnetic tape, and the Internet. It can be widely distributed by being transmitted through a communication network such as

DESCRIPTION OF SYMBOLS 1 ... Communication apparatus 11 ... Communication part 12 ... Control part 13 ... Memory | storage part 131 ... Polling setting file classified by service 132 ... Polling setting file

Claims (2)

A communication device,
Polling time interval storage means for storing a shorter polling time interval as the priority is higher in association with the priority of the service provided by the communication to be performed by the communication device;
Provided by communication started by the polling message in the polling time interval storage means from the time when the polling message is not transmitted to the polling message for polling transmitted from the communication device. Polling time interval elapsed determination means for determining whether or not the polling time interval stored in association with the priority of the service has elapsed;
Polling message transmission control means for transmitting the polling message if it is determined that the polling time interval has elapsed ;
Waiting necessity storage means for storing whether or not it is necessary to wait for a certain period of time before transmission of a polling message transmitted from the communication device in association with the type of service provided by the communication to be performed by the communication device. When,
Before the polling message transmitted from the communication device is transmitted, it is stored that it is necessary to wait for a certain period of time in association with the type of service provided by the communication started by the polling message in the waiting necessity storage unit. Standby necessity determination means for determining whether or not
The polling message transmission control means may need to wait for a certain period of time if it is determined that it is stored that it is necessary to wait for the certain period of time and transmit the polling message, while waiting for the certain period of time. If it is determined not to be stored without a period of time waiting, the communication apparatus characterized by that sends the polling message. A method for operating a communication device, comprising:
The communication device
Corresponding to the priority of the service provided by the communication to be performed by the communication device, the higher the priority is, the shorter the polling time interval is stored, and the communication device is provided by the communication to be performed. Standby necessity storage means for storing whether or not it is necessary to wait for a certain period of time before transmission of the polling message transmitted from the communication device in association with the type of service to be provided,
The operation method of the communication device is:
The communication device needs to wait for a certain period of time in correspondence with the type of service provided by the communication started by the polling message in the waiting necessity storage unit before transmitting the polling message transmitted from the communication device. Determining whether something is remembered,
When it is determined that it is stored that the communication apparatus needs to wait for the certain period, the communication apparatus waits for a certain period and transmits the polling message, or the communication apparatus needs to wait for the certain period When it is determined that there is not stored, the stage of transmitting the polling message without waiting for a certain period,
The communication device does not have a predetermined response to the polling message and the priority of the service provided by the communication started by the polling message in the polling time interval storage means from when the polling message is transmitted. A step of determining whether or not the polling time interval stored in association has elapsed; and when the communication device determines that the polling time interval has elapsed, the polling message of the standby necessity storage means Determining whether it is stored whether it is necessary to wait for a certain period of time in association with the type of service provided by the initiated communication;
When it is determined that it is stored that the communication apparatus needs to wait for the certain period, the communication apparatus waits for a certain period and transmits the polling message, or the communication apparatus needs to wait for the certain period And a step of transmitting the polling message without waiting for a certain period of time when it is determined that there is no information stored.

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