JP2016086304A - Communication controller, communication system, communication control method, and communication control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication controller etc. capable of effectively determining an active state of a terminal device.SOLUTION: A communication controller comprises: speed information acquisition unit for acquiring information on speed with respect to one or both of a communication device and a terminal device; and a determination unit for determining a value of a parameter used for determining disconnection of communication between the communication device and the terminal device on the basis of relative speed between the communication device and the terminal device on the basis of information acquired by the speed information acquisition unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a communication control device, a communication system, a communication control method, and a communication control program.

  In Wi-Fi (registered trademark), an active state of a terminal device (STA: Station) is managed in an access point (AP: Access Point) device (see Non-Patent Document 1). Specifically, the AP device activates a terminal device that is regarded as performing data communication within a time corresponding to a set value (a fixed time, hereinafter referred to as an inactive timeout). It is determined that the terminal device is in a state, and other terminal devices are determined to be inactive terminal devices.

IEEE Std 802.11-2007, "IEEE Standard for Information technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications"

  When the number of terminal devices that attempt to connect to the AP device increases, the number of active terminal devices managed by the AP device reaches an upper limit value, and the number of terminal devices that can communicate with the AP device is limited. A load effect (for example, an off-road effect from cellular to Wi-Fi) was not obtained.

When the set value of InActiveTimeout is large, there are many terminal devices that are in an active state without communicating with the AP device, and the offload effect is reduced.
On the other hand, when the setting value of InActiveTimeout is small, the communication connection is disconnected when there is a frame temporarily even though there is a continuous frame to be communicated between the AP device and the terminal device. Therefore, it is necessary to perform reconnection, and radio resources are wasted due to communication of signals related to reconnection. Further, communication is interrupted due to disconnection of the communication connection.
Also, a suitable value for InActiveTimeout varies depending on the surrounding environment, and particularly depends on the number of terminal devices and whether the terminal devices are moving.

  The present invention has been made in consideration of such circumstances, and provides a communication control device, a communication system, a communication control method, and a communication control program capable of effectively determining the active state of a terminal device. Is an issue.

  In order to solve the above-described problem, a communication control device according to an aspect of the present invention includes a speed information acquisition unit that acquires information about a speed for one or both of a communication device and a terminal device, and the speed information acquisition unit. Determining a value of a parameter used to determine disconnection of communication between the communication device and the terminal device based on a relative speed between the communication device and the terminal device based on information acquired by And a determination unit.

  In order to solve the above problems, a communication system according to one aspect of the present invention includes a terminal device, a communication device, and a communication control device that is integrated with or separate from the communication device, and the communication control device includes: Information on speed is acquired for one or both of the communication apparatus and the terminal apparatus, and the communication apparatus and the terminal apparatus are based on a relative speed between the communication apparatus and the terminal apparatus based on the acquired information. The value of the parameter used to determine to disconnect the communication connection with is determined.

  In order to solve the above-described problem, a communication control method according to an aspect of the present invention acquires information about a speed for one or both of a communication device and a terminal device, and the communication device based on the acquired information Based on the relative speed between the communication device and the terminal device, a value of a parameter used to determine to disconnect the communication connection between the communication device and the terminal device is determined.

  In order to solve the above-described problem, a communication control program according to an aspect of the present invention includes a step of acquiring information on speed for one or both of a communication device and a terminal device, and the above-described information based on the acquired information Determining a value of a parameter used to determine disconnection of communication between the communication device and the terminal device based on a relative speed between the communication device and the terminal device to a computer It is a program to make it.

  ADVANTAGE OF THE INVENTION According to this invention, determination of the active state of a terminal device can be performed effectively.

1 is a diagram illustrating a schematic configuration of a communication system according to an embodiment of the present invention. It is a functional block diagram which shows the schematic structure of AP apparatus which concerns on one Embodiment of this invention. It is a figure which shows an example of the sequence of the communication connection of AP apparatus and terminal device which concern on one Embodiment of this invention. It is a figure which shows an example of InActiveTimeout concerning one Embodiment of this invention. It is a figure for demonstrating the relative speed and communicable time of AP apparatus and terminal device which concern on one Embodiment of this invention. It is a figure which shows the communication environment of AP apparatus and terminal device which concern on one Embodiment (1st Embodiment) of this invention. It is a figure which shows the communication environment of AP apparatus and terminal device which concern on one Embodiment (2nd Embodiment) of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
FIG. 1 is a diagram showing a schematic configuration of a communication system 1 according to an embodiment of the present invention.
A communication system 1 according to the present embodiment includes a cellular base station device 11 of a mobile phone system, an access point device (AP device) 12 that covers a predetermined range, and a plurality of terminals that are mobile phone terminal devices including a smartphone. The apparatus (STA) 31-1 to 31-4 and 32-1 to 32-3 are provided. In this embodiment, the AP device 12 is a Wi-Fi system device, and may be a device of another system.

Here, this embodiment demonstrates the structure which manages the terminal devices 31-1 to 31-4 which exist in the communication area | region 22 by AP apparatus 12. FIG.
In this regard, a similar configuration may be applied to a configuration in which the base station device 11 manages the terminal devices 31-1 to 31-4 and 32-1 to 32-3 existing in the communication area 21. That is, a function similar to that of the AP device 12 described below can be applied to the base station device 11.

In FIG. 2, the storage unit 101 has a memory, and stores various types of information such as programs in an area of the memory. In the present embodiment, the storage unit 101 stores a predetermined correspondence table 131.
The correspondence table 131 shows the correspondence between the relative speed between the AP device 12 and the terminal device (terminal devices 31-1 to 31-4 in the example of FIG. 1) and the value (setting value) of InActiveTimeout used in that case. Store. For example, the contents of the correspondence table 131 may be set in advance, or may be set (changed) at an arbitrary timing.

The communication unit 102 communicates signals wirelessly with the terminal devices 31-1 to 31-4. Further, the communication unit 102 may communicate a signal with another AP device or a higher-level device (high-level device) via a wired or wireless line, for example.
The control unit 103 includes, for example, a CPU (Central Processing Unit), and executes various processes and controls in the AP device 12.

The speed information acquisition unit 121 acquires information about the speed of the AP device 12 or the terminal devices 31-1 to 31-4.
The speed information acquisition unit 121 is, for example, a function of acquiring information on the speed of the own device (AP device 12) by a function such as GPS (Global Positioning System) or an acceleration sensor, and communication with the other device. A function of acquiring information on the speed, and a function of acquiring information on the speed of another apparatus (third apparatus) through communication with another apparatus. When position information is acquired by the GPS function, speed information (for example, relative speed information may be used) using the acquired position information (for example, relative position information may be used). Can be obtained by calculation (calculation).

  The set time determination unit 122 sets the predetermined parameters (time parameters) to the terminal devices 31-1 to 31-4 based on the information acquired by the speed information acquisition unit 121 and the information in the correspondence table 131. Determine the set time (set value). Here, the predetermined parameter is the time (set value) of InActiveTimeout in this embodiment.

The terminal management unit 123 manages the terminal devices 31-1 to 31-4 based on the set time determined by the set time determination unit 122. In this regard, in the present embodiment, the terminal management unit 123 manages whether or not the terminal devices 31-1 to 31-4 are in an active state. Note that the terminal management unit 123 may manage the terminal devices 31-1 to 31-4 for various other matters.
The communication control unit 124 controls wireless communication performed between the terminal devices 31-1 to 31-4 by the communication unit 102 based on information managed by the terminal management unit 123.

FIG. 3 is a diagram illustrating an example of a communication connection sequence between the AP device 12 and the terminal devices 31-1 to 31-4 according to an embodiment of the present invention. This communication connection sequence is the same as the Wi-Fi connection sequence described in Non-Patent Document 1.
In the example of FIG. 3, processing of a communication connection sequence performed between the AP device 12 and one terminal device 31-1 is illustrated, but other terminal devices (for example, terminal devices 31-2 to 31-4) are illustrated. ) Is the same.

In addition, for a predetermined time (for example, 1 minute) after the communication connection between the AP device 12 and the terminal device 31-1 is disconnected, information (history information) about the terminal device 31-1 is valid by the AP device 12. Retained. For this reason, the terminal device 31-1 sends a signal of a reassociation request (ReAssociation Request) to the AP device 12 when the connection is desired again for a predetermined time after the communication connection with the AP device 12 is disconnected. Is transmitted by radio.
Upon receiving this reassociation request signal, the AP device 12 wirelessly transmits a reassociation response (ReAssociation Response) signal to the terminal device 31-1.

  The terminal device 31-1 and the AP device 12 start data communication after completing the exchange of signals shown in FIG. 3 (or exchange of signals of a reassociation request and a reassociation response). At this time, the AP device 12 manages the terminal device 31-1 as an active terminal device by the terminal management unit 123. Further, the AP device 12 manages the number of currently active terminal devices 31-1 to 31-4 by the terminal management unit 123, and the number reaches the upper limit (the maximum number that can be connected). Is controlled not to connect a new terminal device. Specifically, the AP device 12 receives a signal (in this example, a probe request signal, an authentication signal association request signal, or a reassociation request signal) transmitted from a new terminal device. However, by not transmitting a response signal to the signal (in this example, a probe response signal, an authentication signal, an association response signal, or a reassociation response signal), a new terminal device is not connected. To.

Here, the upper limit value of the number of terminal devices 31-1 to 31-4 in the active state managed by the AP device 12 is set mainly by the performance of hardware (H / W), for example.
As an example, the upper limit value may be set for each AP device.
As another example, the upper limit value may be set for each higher-level device (for example, an authentication server device) that accommodates a plurality of AP devices. In this case, this upper limit value is an upper limit value for the total number of terminal devices managed by the plurality of AP devices.

In the present embodiment, as the start time (start time) of this elapsed time [second], the time when the association response signal or the reassociation response signal is communicated (for example, transmitted) is used, but other time points are used. Also good.
In the present embodiment, as the end point of communication connection (end time), a signal such as deassociation or deauthentication is transmitted from the AP device 12 to the terminal device 31-1 when the InActiveTimeout has elapsed. Thus, when the terminal device 31-1 is released from the active state, the time point at which the terminal device 31-1 receives the signal is used, but other time points may be used.

  Here, for example, traffic of a signal communicated (transmitted and received) between the AP device 12 and the terminal device 31-1 is used as the traffic. In the present embodiment, both traffic of a signal transmitted from the AP device 12 to the terminal device 31-1 and a signal transmitted from the terminal device 31-1 to the AP device 12 are used as the traffic. Traffic (only) of a signal transmitted from the AP device 12 to the terminal device 31-1 may be used, or traffic (only) of a signal transmitted from the terminal device 31-1 to the AP device 12 may be used. May be.

  The AP device 12 uses the terminal management unit 123 to transmit a wireless frame between its own device (the AP device 12) and the terminal device 31-1 (one of transmission timing and reception timing). (Or both), the timer count is set to an initial value (for example, zero) and is operated from the initial value. That is, the AP device 12 resets (sets) the timer value to the initial value every time a frame is communicated with the terminal device 31-1 (when traffic occurs), and starts counting again.

For example, at a predetermined timing (as an example, at a fixed cycle timing), the AP apparatus 12 determines whether the value (no-communication time value) measured by the timer by the terminal management unit 123 exceeds the set value of InActiveTimeout. Determine.
As a result, when the AP device 12 determines that the value measured by the timer exceeds the set value of InActiveTimeout by the terminal management unit 123, the terminal device 31-1 is not communicating data. The terminal device 31-1 is determined to be released from the active state (communication connection is disconnected). For example, the AP device 12 transmits a signal such as de-association or de-authentication to the terminal device 31-1 by the communication control unit 124 controlled by the terminal management unit 123. -1 is released from the active state.

On the other hand, when the AP management unit 123 determines that the value measured by the timer is equal to or less than the set value of InActiveTimeout, the AP device 12 continues to manage the terminal device 31-1 in the active state. However, when the communication connection is terminated (for example, forced termination) for reasons other than InActiveTimeout, the AP device 12 transmits a signal such as de-association or deauthentication to the terminal device 31-1. The terminal device 31-1 is released from the active state.
In the example of FIG. 4, the set value of InActiveTimeout is 180 seconds. In the example of FIG. 4, the terminal device 31-1 is in the active state from when the AP device 12 and the terminal device 31-1 are connected for communication until when the no-communication time exceeds the set value of InActiveTimeout.

This will be described with reference to FIG.
For example, when the AP device 211 mounted on the airplane 201 and the terminal devices 221-1 to 221-2 existing on the ground communicate with each other wirelessly, the AP device 211 and the terminal devices 221-1 to 221-2 are normally connected. When the relative speed is high, the time for which communication is possible (communication available time) is shortened, while when the relative speed between the AP device 211 and the terminal devices 221-1 to 221-2 is low, the time for which communication is possible (communication is possible). It can be said that time is long.
The relationship between the relative speed and the communicable time is the same when the AP device 261 mounted on the vehicle 251 and the terminal devices 271-1 to 271-2 existing on the ground communicate with each other wirelessly.
The same applies to the case where the AP device is mounted on a moving body other than the airplane 201 and the vehicle 251.

In this example, the terminal devices 221-1 to 221-2 and 271-1 to 271-2 are considered to be stopped (stationary), but the terminal devices 221-1 to 221-2 and 271-1 are considered. When ˜271-2 moves, the movement of the terminal devices 221-1 to 221-2 and 271-1 to 271-2 is also reflected in the relative speed.
In this example, the AP apparatuses 211 and 261 move, and the terminal apparatuses 221-1 to 221-2 and 271-1 to 271-2 do not move (or the movement speed is relatively low). However, conversely, also when the terminal devices 221-1 to 221-2 and 271-1 to 271-2 move and the AP devices 211 and 261 do not move (or move relatively slowly). The same applies to the case where the moving speeds of the AP apparatuses 211 and 261 are close to the moving speeds of the terminal apparatuses 221-1 to 221-2 and 271-1 to 271-2.

  The AP device 12 according to the present embodiment variably sets the setting value of InActiveTimeout based on the relative speed between the own device (the AP device 12) and the terminal devices 31-1 to 31-4.

Here, in the AP device 12, various timings may be used as the timing for setting (for example, changing) the setting value of InActiveTimeout by the setting time determination unit 122. As this timing, for example, the timing of a certain period, the timing when the relative speed is determined to be greater than or equal to a predetermined threshold (or exceeding the predetermined threshold), and the relative speed is equal to or lower than the predetermined threshold (or the predetermined threshold) The timing at which it is determined that the number of terminal devices 31-1 to 31-4 managed by the AP device 12 is equal to or greater than a predetermined threshold (or exceeds the predetermined threshold), or One or more of the timings at which it is determined that the number of terminal devices 31-1 to 31-4 managed by the AP device 12 is equal to or less than a predetermined threshold (or less than the predetermined threshold) are used. Also good.
It should be noted that if a fixed cycle timing is used as the timing for setting (for example, changing) the set value of InActiveTimeout, optimization can be achieved at a fixed cycle. In addition, when it is desired to reduce the frequency of setting (for example, changing) the setting value of InActiveTimeout, it may be preferable to use a timing other than a fixed cycle timing.

  As another configuration example, based on the relative speed between the AP device 12 and the terminal devices 31-1 to 31-4, it is determined to increase or decrease the setting value of the InActiveTimeout compared to the current setting value, When it is determined to increase the setting value of InActiveTimeout, the setting value of InActiveTimeout is increased by a predetermined amount (for example, a predetermined amount for one stage) with respect to the current setting value, and the setting value of InActiveTimeout is set. If it is decided to reduce the value, a configuration may be used in which the setting value of InActiveTimeout is reduced by a predetermined amount (for example, a predetermined amount for one step) with respect to the current setting value.

  In addition, the functions of the AP device 12 according to the present embodiment (for example, the functions of the correspondence table 131, the speed information acquisition unit 121, the set time determination unit 122, the terminal management unit 123, and the communication control unit 124) It is also possible to apply to other communication devices that can be accommodated (managed). As an example of such a communication apparatus, a cellular base station apparatus may be used. In this case, for example, a connection sequence between the cellular base station apparatus and the terminal apparatus is used instead of the connection sequence shown in FIG. Active and idle states are used instead of active and inactive states.

[First Embodiment]
FIG. 6 is a diagram illustrating a communication environment between the AP apparatuses 311 and 361 and the terminal apparatuses 321-1 to 321-3 and 371-1 to 371-3 according to an embodiment (first embodiment) of the present invention. .

  Moreover, in this embodiment, for convenience of explanation, the same reference numerals as those of the components 101 to 103, 121 to 124, and 131 included in the AP device 12 illustrated in FIG. 2 are used for the AP devices 311 and 361 illustrated in FIG. It explains using.

In the example of FIG. 6, the vehicle 301 moves on a track, and a station platform exists on the track.
The AP device 311 mounted on the vehicle 301 and the terminal devices 321-1 to 321-3 existing inside the vehicle 301 and existing in the communication area of the AP device 311 communicate with each other wirelessly.
Further, the AP device 361 installed in the station platform and the terminal devices 371-1 to 371-3 existing in the station platform and existing in the communication area of the AP device 361 communicate with each other wirelessly.

When the vehicle 301 is away from the platform of the station, the terminal devices 371-1 to 371-3 existing at the platform of the station exist outside the communication area of the AP device 311 mounted on the vehicle 301, and the AP device 311 and the terminal devices 371-1 to 371-3 do not communicate wirelessly.
Further, when the vehicle 301 is away from the platform of the station, the terminal devices 321-1 to 321-3 existing inside the vehicle 301 exist outside the communication area of the AP device 361 installed in the platform of the station. The AP device 361 and the terminal devices 321-1 to 321-3 do not communicate wirelessly.

When the vehicle 301 approaches the station platform or stops at the station platform, the terminal devices 371-1 to 371-3 existing at the station platform exist in the communication area of the AP device 311 mounted on the vehicle 301. The AP device 311 and the terminal devices 371-1 to 371-3 can communicate wirelessly.
Also, when the vehicle 301 approaches the station platform or stops at the station platform, the terminal devices 321-1 to 321-3 existing inside the vehicle 301 are connected to the AP device 361 installed in the station platform. The AP device 361 and the terminal devices 321-1 to 321-3 exist in the communication area and can communicate wirelessly.

  Hereinafter, the AP apparatus 311 according to the present embodiment will be described as an example. In this regard, a function similar to that of the AP device 311 can be applied to the AP device 361. For example, descriptions of the AP device 311 mounted on the vehicle 301, the terminal devices 321-1 to 321-3 existing inside the vehicle 301, and the terminal devices 371-1 to 371-3 existing on the platform of the station, The description will be replaced with the description of the AP device 361 installed in the station platform, the terminal devices 371-1 to 371-3 existing in the station platform, and the terminal devices 321-1 to 321-3 existing inside the vehicle 301.

  In the AP device 311, the correspondence table 131 includes the relative speed between the AP device 311 and the terminal device (terminal devices 321-1 to 321-3 and 371-1 to 371-3 in the example of FIG. 6), in that case. The correspondence with the value (setting value) of InActiveTimeout used for the is stored. As this correspondence, for example, with respect to the value of the relative speed and InActiveTimeout, a continuous correspondence relationship may be used by a mathematical formula or the like, or a discrete correspondence relationship may be used. As an example of the continuous correspondence relationship, the value of InActiveTimeout is obtained by substituting the relative speed into the formula using the formula using the relative speed and the value of InActiveTimeout as parameters. As an example of a discrete correspondence relationship, the relative speed is divided into a plurality of ranges, and the value of InActiveTimeout is associated with each relative speed range.

  In the present embodiment, the above-described correspondence is set so that the value of InActiveTimeout is smaller when the relative speed is larger and the value of InActiveTimeout is larger when the relative speed is smaller. In the present embodiment, in the AP device 311, the terminal devices 321-1 to 321-3 and 371-1 to 371-3 (respective terminal devices 321-1 to 321-3 and 371-1 to 371- For each wireless link 3), the value of InActiveTimeout is determined. As a result, in the AP device 311, the terminal device having a large relative speed with the own device (the AP device 311) manages the active state with a small InActiveTimeout value, while the terminal device with a small relative speed with the own device. Manages the active state with a large InActiveTimeout value.

Processing performed in the AP apparatus 311 according to the present embodiment will be described.
First, in the AP device 311, the speed information acquisition unit 121 acquires information about the speed. As information about the speed, information that can acquire a relative speed between the AP apparatus 311 and a terminal apparatus (for example, one target terminal apparatus, which is referred to as terminal apparatus A in this example) is used. For example, information on the relative speed itself may be used, or information used to calculate (calculate) the relative speed (for example, information on the speed of the AP device 311 and information on the terminal device A) Speed information) may be used.

Next, in the AP device 311, the set time determination unit 122 calculates (calculates) the relative speed between the AP device 311 and the terminal device A based on the information acquired by the speed information acquisition unit 121.
Next, in the AP device 311, the set time determination unit 122 reads the value of InActiveTimeout corresponding to the calculated relative speed with reference to the contents of the correspondence table 131 stored in the storage unit 101, and the AP device 311. It is determined as the set value (set time) of InActiveTimeout to be set to.

  Here, in the present embodiment, the setting time determination unit 122 is configured to calculate (calculate) the relative speed between the AP device 311 and the terminal device A based on the information acquired by the speed information acquisition unit 121. As another configuration example, the speed information acquisition unit 121 acquires information on the relative speed between the AP device 311 and the terminal device A, and the set time determination unit 122 adds information on the relative speed acquired by the speed information acquisition unit 121. A configuration in which the set time is determined based on this may be used.

Then, in the AP device 311, the terminal management unit 123 sets the set time (set value of InActiveTimeout) determined by the set time determining unit 122, and uses the set time to establish communication connection with the terminal device A. to manage. In the present embodiment, the setting value of InActiveTimeout is set and used for each of the terminal devices 321-1 to 321-3 and 371-1 to 371-3 for each AP device 311.
In the AP apparatus 311, the terminal management unit 123 manages the communication, and the communication control unit 124 controls communication with the terminal apparatuses 321-1 to 321-3 and 371-1 to 371-3.

Next, in the AP apparatus 311, information regarding the speed acquired by the speed information acquiring unit 121 and a method for calculating the relative speed by the set time determining unit 122 will be described.
As an example, in the AP device 311, the speed information acquisition unit 121 detects the reception power of a predetermined signal that is wirelessly transmitted from the terminal device A and received by the communication unit 102, and changes in the detected reception power (variation of the fluctuation). Value) is detected and acquired as speed information. Then, in the AP device 311, the set time determination unit 122 uses the AP device 311 and the terminal device A based on the information acquired by the speed information acquisition unit 121 (reception power fluctuation) using a predetermined mathematical formula. The relative speed is calculated.

Here, various signals may be used as the predetermined signal. For example, one or more signals of a probe request, an authentication, an association request, or a reassociation request may be used.
Also, as received power, for example, RSSI (Received Signal Strength Indication) may be used, or another index may be used.
In addition, as variations in received power, for example, the difference between the previous instantaneous value and the average value, variance, information of cumulative distribution function (CDF), probability density function (PDF: Probability Density Function) A value (variation value) calculated by a predetermined mathematical formula using information or the like or a combination of two or more of these may be used.
The fluctuation (value of fluctuation) of the received power and the relative speed are associated with each other by, for example, an equation. Normally, it is considered that the received power varies greatly (violently) as the relative speed increases.

  As another example, in the AP apparatus 311, the speed information acquisition unit 121 includes information (for example, acceleration) about the speed of the own apparatus detected by a function of a GPS or an acceleration sensor provided in the own apparatus (the AP apparatus 311). Or information on the speed of the terminal device A notified from the terminal device A (for example, information on acceleration) may be acquired. The terminal device A has a function such as a GPS or an acceleration sensor. The terminal device A acquires information on the speed of the own device (the terminal device A) using the function of the GPS or acceleration sensor, and the acquired information on the speed of the own device is predetermined. And transmitted to the AP apparatus 311 by radio. Then, in the AP device 311, the set time determination unit 122 uses a predetermined mathematical formula based on the information acquired by the speed information acquisition unit 121 (information regarding the speed of the AP device 311 and information regarding the speed of the terminal device A). Thus, the relative speed between the AP device 311 and the terminal device A is calculated.

Here, the information on the speed may include, for example, information on the direction of the speed (direction in which the apparatus moves) and information on the value of the speed (distance that the apparatus moves in a predetermined time).
For example, the set time determination unit 122 can compare the speed of the AP device 311 and the speed of the terminal device A, and acquire the difference as a relative speed.
Various signals may be used as a predetermined signal used for notifying (transmitting) information regarding the speed of the terminal device A from the terminal device A to the AP device 311. For example, a probe request One or more signals of authentication, association request, or reassociation request may be used.

In the AP device 311 mounted on the vehicle 301, for example, the relative speed is not obtained for the terminal devices 371-1 to 371-3 existing at the station platform (the value of InActiveTimeout is determined using the relative speed). A configuration in which the speed of the terminal devices 371-1 to 371-3 is regarded as zero (0) may be used.
Here, in the AP device 311 mounted on the vehicle 301, for example, by including predetermined information in signals transmitted from the terminal devices 371-1 to 371-3 existing in the platform of the station, based on the information. Then, it is determined that the transmission source of the signal is the terminal device 371-1 to 371-3 existing in the station platform. Each of the terminal devices 321-1 to 321-3 and 371-1 to 371-3 is, for example, a signal transmitted wirelessly from the AP device 311 mounted on the vehicle 301, or an AP device 361 installed in the station platform. Using one or more of signals transmitted wirelessly from one another or signals transmitted wirelessly from another device (the terminal devices 321-1 to 321-3, 371-1 to 371-3). ) May exist inside the vehicle 301 or at the station platform.
For example, an in-vehicle SSID (Service Set Identifier) may be used in the AP device 311 mounted on the vehicle 301, and the home SSID may be used in the AP device 361 installed in the station platform. The SSID is an identifier of an access point (AP) in a wireless LAN (Local Area Network).

As described above, in the AP device 12 according to the present embodiment, the terminal devices 31-1 to 31-31 are based on the relative speed (or an index regarded as representing the terminal device) 31-1 to 31-4. -4 is determined and set for a predetermined parameter (in this embodiment, a setting value of InActiveTimeout) used for communication connection with -4.
In addition, in the AP device 12 according to the present embodiment, for example, the setting value of InActiveTimeout is determined and set for each of the terminal devices 31-1 to 31-4.

  In the example of FIG. 6, in the AP device 311 mounted on the vehicle 301 or the AP device 361 installed in the platform of the station, the terminal devices 321-1 to 321-1 existing inside the vehicle 301 entering or leaving the station. It is possible to determine and set an appropriate setting value of InActiveTimeout by changing the setting value of InActiveTimeout between the terminal device 371-1 to 371-3 existing in the platform of the station 321-3.

  As described above, according to the AP device 12 according to the present embodiment, by setting the InActiveTimeout according to the communication environment, for example, an offload effect (for example, an offload effect from cellular to Wi-Fi). ) Can be improved, the frequency can be used effectively, and unnecessary communication disconnection can be eliminated. As an example, according to the AP device 12 according to the present embodiment, communication connection with more new terminal devices 31-1 to 31-4 is possible, and more terminal devices 31-1 to 31-4 can be connected. It is possible to communicate efficiently. Further, in the AP device 12, for example, it is possible not to increase the upper limit of the number of terminal devices 31-1 to 31-4 in an active state.

  Here, a suitable value for InActiveTimeout varies depending on the surrounding environment, and depends on the number of terminal devices 31-1 to 31-4 and whether the terminal devices 31-1 to 31-4 are moving. In the AP device 12 according to the embodiment, the value of InActiveTimeout that aims to effectively use the system capacity can be obtained based on the relative speed with the terminal devices 31-1 to 31-4.

Thus, in the AP device 12 according to the present embodiment, the active state of the terminal devices 31-1 to 31-4 can be determined effectively.
For example, the AP device 12 adjusts a timer setting value (setting value of InActiveTimeout) for determining the active state of the terminal devices 31-1 to 31-4, thereby adjusting the terminal device 31 that is in an active state but not communicating. -1 to 31-4 can be efficiently removed from the active state.

As a specific example, a terminal device having a large relative speed with the AP device 12 is considered to have a short communication time with the AP device 12, but when the set value of InActiveTimeout for such a terminal device is large, the AP device 12 Many terminal devices that are in an active state even though they are not communicating with each other occur, and new terminal devices cannot connect to the communication. On the other hand, for example, the upper limit of the number of terminal devices that can be managed in the active state in the AP device 12 can be considered, but the cost is considered to increase. Therefore, it is useful to reduce the setting value of InActiveTimeout for the terminal device having a large relative speed with the AP device 12 by the configuration of the present embodiment.
In addition, it is considered that a terminal device having a small relative speed with the AP device 12 has a long communicable time with the AP device 12, but when the set value of InActiveTimeout for such a terminal device is small, the AP device 12 and the terminal Although there is a continuous frame to be communicated with the device, the communication connection is disconnected when the frame is temporarily vacated, and it is necessary to perform reconnection. This wastes radio resources. Further, communication is interrupted due to disconnection of the communication connection. Therefore, it is useful to increase the setting value of InActiveTimeout for the terminal device having a small relative speed with the AP device 12 according to the configuration of the present embodiment.

  In the present embodiment, the vehicle 301 (train in the example of FIG. 6) is shown as an example of the moving body. However, various other types of moving bodies may be used. An airplane or the like may be used.

[Second Embodiment]
FIG. 7 is a diagram showing a communication environment between the AP devices 411 and 421 and the terminal devices 431-1 to 431-3 according to an embodiment (second embodiment) of the present invention.

  Further, in the present embodiment, for convenience of explanation, the AP devices 411 and 421 illustrated in FIG. 7 are denoted by the same reference numerals as the components 101 to 103, 121 to 124, and 131 included in the AP device 12 illustrated in FIG. It explains using.

Processing performed in the AP device 411 according to the present embodiment will be described.
First, in the AP device 411 mounted on the airplane 401, the speed information acquisition unit 121 acquires information regarding the speed of the own device (the AP device 411). In the AP apparatus 411, the set time determination unit 122 determines whether the own apparatus (the AP apparatus 411) is moving.
In addition, in the AP device 411 mounted on the airplane 401, the set time determination unit 122 causes the terminal device (for example, one target terminal device, which is referred to as the terminal device B in this example) to It is determined whether or not (the AP device 411) exists inside the airplane 401 on which it is mounted.

  As a result, the AP device 411 mounted on the airplane 401 determines that the own device (the AP device 411) is moving, and the terminal device B is mounted with the own device (the AP device 411). When it is determined that the terminal device B does not exist inside the airplane 401, the terminal device B is regarded as not moving (stopped and the speed is zero (0)), and the set time determination unit 122 The relative speed between the own apparatus (the AP apparatus 411) and the terminal apparatus B (in this example, the same speed as the own apparatus) is calculated (calculated), and the relative speed is referred to by referring to the contents of the correspondence table 131. The setting value of InActiveTimeout corresponding to is read and set.

The contents of the correspondence table 131 are the same as in the case of the first embodiment, for example.
The method for calculating the relative speed is the same as that in the first embodiment, for example, except that the speed of the terminal device B is regarded as zero (0) in this embodiment.

Then, in the AP device 411 mounted on the airplane 401, the terminal management unit 123 sets the set time (set value of InActiveTimeout) determined by the set time determining unit 122, and uses the set time, the terminal device B Manage communication connections with. In this embodiment, the setting value of InActiveTimeout is used for each AP device 411.
Further, in the AP device 411 mounted on the airplane 401, the communication is managed by the terminal management unit 123 and the communication control unit 124 controls communication with the terminal device B.

  Here, in this embodiment, since the AP device 411 regards the speed of the terminal devices 431-1 to 431-3 existing on the ground as zero (0), for these terminal devices 431-1 to 431-3, When the same correspondence table 131 is used, the same set value of InActiveTimeout is determined and used. As another configuration example, a configuration may be used in which different setting values of InActiveTimeout may be determined for the terminal devices 431-1 to 431-3 by using other conditions regarding the setting values of InActiveTimeout.

Next, information regarding the speed acquired by the speed information acquisition unit 121 and a method for determining whether or not the own device (AP device 411) is moving by the set time determination unit 122 will be described.
As an example, in the AP device 411, the speed information acquisition unit 121 detects the reception power of a predetermined signal wirelessly transmitted from the AP device 421 installed on the ground and received by the communication unit 102, and the detected reception power Is detected and acquired as speed-related information. Here, the AP device 421 installed on the ground wirelessly transmits a predetermined signal. Various signals may be used as the predetermined signal, for example, a beacon signal may be used.
Note that received power and fluctuations in received power are the same as in the first embodiment, for example.
As another configuration example, the AP device 411 mounted on the airplane 401 wirelessly transmits a signal such as a predetermined beacon, and the AP device 421 installed on the ground receives the signal and receives information such as fluctuations in received power. A configuration may be used in which (information regarding speed) is detected and the information is notified (transmitted) to the AP device 411 mounted on the airplane 401.

  Then, in the AP device 411, the set time determination unit 122 determines whether the own device (the AP device 411) is moving based on the information (variation in received power) acquired by the speed information acquisition unit 121. judge. For example, the set time determination unit 122 determines that the own device is moving when the variation in the received power is equal to or greater than a predetermined threshold (or exceeds the predetermined threshold), while in other cases, It is determined that the own device has not moved. Here, various values may be used as the predetermined threshold. In this example, if the variation in received power is less than a predetermined threshold (or less than or equal to a predetermined threshold), it is considered that the own device is not moving.

  As another example, in the AP device 411, the speed information acquisition unit 121 includes information (for example, acceleration) about the speed of the own device detected by a function of a GPS or an acceleration sensor provided in the own device (the AP device 411). Information). In the AP device 411, the set time determination unit 122 determines that the speed of the own device is equal to or higher than a predetermined threshold based on the information acquired by the speed information acquisition unit 121 (information on the speed of the AP device 411) (or In the case of exceeding the predetermined threshold value), it is determined that the own device is moving. In other cases, it is determined that the own device is not moving. Here, various values may be used as the predetermined threshold. In this example, when the speed of the own device is less than the predetermined threshold (or is equal to or lower than the predetermined threshold), the own device is regarded as not moving.

  In the present embodiment, for example, the AP device 411 mounted on the airplane 401 has an AP installed on the ground before communicating with the terminal devices 431-1 to 431-3 existing on the ground (or other timing). It communicates with the device 421, detects the relative speed (or an index related thereto) between the AP devices 411 and 421, and based on the result, the terminal devices 431-1 to 431-3 existing on the ground Determine the setting value and set it.

  For example, when the airplane 401 is turning in the sky, generally, the relative relationship between the airplane 401 (the AP device 411 mounted on the airplane 401) and the terminal devices 431-1 to 431-3 existing on the ground. The speed is small, and the terminal devices 431-1 to 431-3 existing on the ground appear to be stopped (stationary) from the airplane 401 (the AP apparatus 411 mounted on the airplane 401). Further, when the airplane 401 is turning in the sky, since the area can be widened, the influence on the relative speed due to the movement of the terminal devices 431-1 to 431-3 existing on the ground is small. On the other hand, while the airplane 401 is heading to the destination for turning, the relative speed between the airplane 401 (the AP device 411 mounted on the airplane 401) and the one existing on the ground (for example, the AP device or the terminal device). Is big.

  As an example, an AP device 421 and terminal devices 431-1 to 431-3 exist at a destination where the airplane 401 makes a turn, and an AP device does not exist in the middle of the airplane 401 toward the destination where the airplane 401 makes a turn. Then, the setting value of InActiveTimeout in the AP apparatus 411 is not changed (set) while the airplane 401 is heading to the destination to turn, and the setting of InActiveTimeout is set when the airplane 401 arrives at the destination to make a turn and turns. The value is changed (set), and communication is performed wirelessly between the AP device 411 mounted on the airplane 401 and the terminal devices 431-1 to 431-3 existing on the ground.

  As another example, the AP device 421 and the terminal devices 431-1 to 431-3 exist at the destination where the airplane 401 turns, and the AP device (AP In an environment where an AP device other than the device 421 is present, the aircraft 401 (the AP device 411 mounted on the airplane 401) and the AP device (the AP device) existing on the ground are in the middle of the airplane 401 heading to the destination for turning. Since the relative speed with the AP device other than 421 is large, the setting value of InActiveTimeout in the AP device 411 is small, and when the airplane 401 arrives at the destination where the airplane turns and turns, the airplane 401 (mounted on the airplane 401) Since the relative speed between the AP device 411) and the AP device 421 existing on the ground is small, the AP device 411 has Setting value of InActiveTimeout increases.

  As described above, in the AP device 12 according to the present embodiment, when the AP device 12 is moving, the speed of the terminal devices 31-1 to 31-4 is regarded as zero (0), and the terminal device 31. Predetermined parameters (this embodiment) used for communication connection with the terminal devices 31-1 to 31-4 based on the relative speed with the terminal devices 31-1 to 31-4 in this embodiment (the moving speed of the AP device 12 in this embodiment) In the form, the setting value of InActiveTimeout is determined and set.

  In the example of FIG. 7, an AP device 411 is mounted on an airplane 401 (for example, an unmanned aircraft), and a terminal device that exists on the ground is in the middle of the airplane 401 toward a destination (for example, an evacuation center). The relative speed of the terminal device is large, and the InActiveTimeout is set to a small value (or is not changed). On the other hand, when turning over the destination, the relative speed with the terminal device existing on the ground is In order to stay small, it is possible to increase the set value of InActiveTimeout.

  As described above, the AP device 12 according to the present embodiment can effectively determine the active state of the terminal devices 31-1 to 31-4.

[Third Embodiment]
The AP device 12 and the terminal devices 31-1 to 31-4 in the communication system 1 shown in FIGS. 1 and 2 will be described as examples.
In the AP device 12, the speed information acquisition unit 121 and the set time determination unit 122 allow two of the own device (the AP device 12) and a plurality of terminal devices (in this example, the terminal devices 31-1 to 31-4). The relative speed with each of the above is calculated (calculated). In the AP device 12, when there are many terminal devices having a large relative speed, the set time determination unit 122 determines a small InActiveTimeout setting value in units of the AP device 12 (for each AP device 12). On the other hand, if there are many terminal devices with a small relative speed, a large setting value of InActiveTimeout is determined and set in units of the AP device 12 (for each AP device 12).

Here, the set time determination unit 122 determines whether or not the relative speed is large (or whether or not it is small) using, for example, a predetermined threshold related to the relative speed.
Further, the set time determination unit 122 determines whether or not there are many predetermined terminal devices (terminal devices having a large relative speed or terminal devices having a low relative speed) using, for example, a predetermined threshold regarding the number of terminal devices. judge.
Further, the value of InActiveTimeout to be set (the setting value of the above-mentioned small InActiveTimeout or the setting value of the above-mentioned large InActiveTimeout) is determined in advance, for example.

  Note that the AP device 12 may determine the setting value of InActiveTimeout by calculating the relative speed for all the terminal devices 31-1 to 31-4 accommodated by the own device (the AP device 12), for example. Alternatively, the relative speed may be calculated for some of the terminal devices 31-1 to 31-4 accommodated by the own device, and the setting value of InActiveTimeout may be determined.

  As another configuration example, in the AP device 12, the speed information acquisition unit 121 and the set time determination unit 122 cause the own device (the AP device 12) and a plurality of terminal devices (in this example, terminal devices 31-1 to 31-31). 4 (at least 2 out of 4) are calculated (calculated), and the set time determination unit 122 calculates the average value, minimum value, maximum value, or the like of the relative speeds of the plurality of terminal devices. (Calculation), and based on the value (one relative speed value) of the calculation result, the setting value of InActiveTimeout is determined and set in units of the AP device 12 (for each AP device 12) May be used. Note that the method for determining the set value of InActiveTimeout corresponding to the relative speed is the same as in the first embodiment, for example.

As described above, in the AP device 12 according to the present embodiment, based on the relative speeds obtained for the plurality of terminal devices 31-1 to 31-4, in units of the AP device 12 (for each AP device 12. ), Determine and set the set value of InActiveTimeout.
Thereby, in the AP apparatus 12 which concerns on this embodiment, the active state determination of the terminal devices 31-1 to 31-4 can be performed effectively.

[Fourth Embodiment]
The AP device 12 and the terminal devices 31-1 to 31-4 in the communication system 1 shown in FIGS. 1 and 2 will be described as examples.
In the AP device 12, the own device (the AP device 12) and the terminal device (in this example, one of the terminal devices 31-1 to 31-4) are detected by the speed information acquisition unit 121 and the set time determination unit 122. Is calculated (calculated). In the AP device 12, when the terminal management unit 123 determines that the calculated relative speed is equal to or higher than the predetermined threshold (or exceeds the predetermined threshold), the communication connection with the terminal device is established. On the other hand, if it is determined that the calculated relative speed is less than the predetermined threshold (or less than the predetermined threshold), the communication connection with the terminal device is permitted. Control to do.
The method for calculating the relative speed is the same as that in the first embodiment, for example.

  Here, in the present embodiment, before the connection of communication between the AP device 12 and the terminal devices 31-1 to 31-4 is completed (for example, in standby), the AP device 12 permits the connection of the communication. Whether or not (permitted or not permitted) is determined and controlled. As another configuration example, when the AP apparatus 12 determines whether or not to permit communication connection when the AP apparatus 12 and the terminal apparatuses 31-1 to 31-4 are connected for communication. For example, a configuration may be used in which the AP device 12 is controlled to disconnect the current communication connection when it is determined that the communication connection is not permitted, or the current communication connection is used. May be used, and a configuration may be used in which control is performed so that connection of the next communication is not permitted.

As described above, in the AP device 12 according to the present embodiment, communication connection with the terminal devices 31-1 to 31-4 is permitted based on the relative speed with the terminal devices 31-1 to 31-4. Control whether or not.
Thereby, the communication between the AP device 12 using the InActiveTimeout and the terminal devices 31-1 to 31-4 can be made efficient.

[Fifth Embodiment]
The AP device 12 and the terminal devices 31-1 to 31-4 in the communication system 1 shown in FIGS. 1 and 2 will be described as examples.
In the AP device 12, the communication control unit 124 controls, and the communication unit 102 wirelessly transmits a signal such as a predetermined beacon including information related to the speed of the own device (the AP device 12).
Each of the terminal devices 31-1 to 31-4 receives the signal wirelessly transmitted from the AP device 12, and based on the information regarding the speed of the AP device 12 included in the signal, the AP device 12 and the own device. Calculate (calculate) the relative speed with each of the terminal devices 31-1 to 31-4. Then, in each of the terminal devices 31-1 to 31-4, when it is determined that the calculated relative speed is large, the terminal device 31-1 to 31-4 is controlled so as to disallow processing for attempting communication connection with the AP device 12. When it is determined that the calculated relative speed is small, control is performed so as to permit a process of attempting communication connection with the AP device 12.

Here, in the present embodiment, the relative speed is calculated in each of the terminal devices 31-1 to 31-4, but the method for calculating the relative speed is the same as that in the first embodiment, for example.
Moreover, in the terminal devices 31-1 to 31-4, it is determined whether the relative speed is large (or whether it is small) using, for example, a predetermined threshold value related to the relative speed.

As described above, the terminal devices 31-1 to 31-4 according to the present embodiment control whether to permit communication connection with the AP device 12 based on the relative speed with the AP device 12. .
Thereby, the communication between the AP device 12 using the InActiveTimeout and the terminal devices 31-1 to 31-4 can be made efficient.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  Moreover, for realizing the function of each device (for example, the AP device 12, the base station device 11, the terminal devices 31-1 to 31-4, 32-1 to 32-3, etc.) according to the above-described embodiment. Processing may be performed by recording the program on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium.

DESCRIPTION OF SYMBOLS 1 ... Communication system, 11 ... Base station apparatus, 12, 211, 261, 311, 361, 411, 421 ... AP apparatus, 21-22 ... Communication area, 31-1 to 31-4, 32-1 to 32-3 , 221-1 to 221-2, 271-1 to 271-2, 321-1 to 321-3, 371-1 to 371-3, 431-1 to 431-3, terminal device, 101, storage unit, 102 ... Communication part 103 ... Control part 121 ... Speed information acquisition part 122 ... Set time determination part 123 ... Terminal management part 124 ... Communication control part 201, 401 ... Airplane, 251, 301 ... Vehicle

Claims (12)

A speed information acquisition unit that acquires information about speed for one or both of the communication device and the terminal device;
Used to determine disconnection of communication between the communication device and the terminal device based on a relative speed between the communication device and the terminal device based on information acquired by the speed information acquisition unit. A determination unit for determining the value of the parameter;
A communication control device comprising: The determining unit determines the value of the parameter for each of the plurality of terminal devices;
The communication control apparatus according to claim 1. The determining unit regards the speed of the terminal device as zero when a predetermined condition is satisfied;
The communication control apparatus of any one of Claim 1 or Claim 2. The predetermined condition is a condition for the determination unit to determine that the communication device is moving and to determine that the terminal device is out of a predetermined range.
The communication control apparatus according to claim 3. The determination unit determines a value of the parameter as a value of the parameter common to the plurality of terminal devices based on a relative speed between the communication device and the terminal device obtained for the plurality of terminal devices. To
The communication control apparatus according to claim 1. Based on the value of the parameter determined by the determination unit, a terminal management unit that manages communication between the communication device and the terminal device;
A communication control unit that controls communication with the terminal device performed by the communication device,
The communication control apparatus according to any one of claims 1 to 5. The terminal management unit controls, for each terminal device, whether to permit connection of communication with the communication device based on a relative speed between the communication device and the terminal device;
The communication control apparatus according to claim 6. The parameter is a non-communication time used for determining to disconnect the communication connection between the communication device and the terminal device.
The communication control apparatus according to any one of claims 1 to 7. The communication control device is integral with the communication device.
The communication control apparatus according to any one of claims 1 to 8. A terminal device, a communication device, and a communication control device integrated with or separate from the communication device,
The communication control device includes:
Obtaining information about speed for one or both of the communication device and the terminal device;
Based on a relative speed between the communication device and the terminal device based on the acquired information, a value of a parameter used to determine disconnection of communication between the communication device and the terminal device is determined. To
Communications system. Get information about speed for one or both of the communication device and the terminal device,
Based on a relative speed between the communication device and the terminal device based on the acquired information, a value of a parameter used to determine disconnection of communication between the communication device and the terminal device is determined. To
Communication control method. Obtaining speed information for one or both of the communication device and the terminal device;
Based on a relative speed between the communication device and the terminal device based on the acquired information, a value of a parameter used to determine disconnection of communication between the communication device and the terminal device is determined. And steps to
Communication control program for causing a computer to execute.

Images