JP2014068138A - Clock controller, clock control method, and clock control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress performance deterioration of a clock synchronization device due to a change in a clock frequency of the clock synchronization device when avoiding the interference of the clock synchronization device with radio communication.SOLUTION: A clock controller includes: frequency storage means for storing one or more frequencies of a clock signal suppliable to a device included in an information processor connected to a radio communication device without interfering with radio communication using each of a plurality of frequency bands that can be used by the radio communication device for the radio communication; detection means for detecting each of the used frequency bands used by the radio communication device; selection means for selecting the highest clock frequency among clock frequencies suppliable without interfering with the radio communication even to any of the used frequency bands; and setting means for transmitting the selected clock frequency to the information processor which receives the clock frequency and supplies a clock signal having the received clock frequency to the device.

Description

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

  Disturbance noise is a cause of deterioration in wireless communication quality of wireless communication devices. As a noise generation source, there is a clock synchronization device, which is a device operating in synchronization with a clock in a communication device. The radio communication quality deteriorates by interfering with communication by the communication device in the channel of the frequency band including the harmonics of the clock synchronization device.

  FIG. 9 is a diagram illustrating an example of the harmonics of the clock synchronization device and the frequency of the radio wave used in communication.

  A curve in the figure represents a radio wave spectrum of wireless communication in which a wireless communication device uses a certain channel. In wireless communication, a specific frequency width centered on a specific frequency is called a channel. Δf in the figure represents a frequency band used for communication in a certain channel. On the other hand, the clock synchronization device propagates and radiates harmonics of the operation clock. The dotted lines in the figure represent the nth, (n + 1) th, (n + 2) th, and (n + 3) th harmonics. When Δf, which is a frequency range used in communication, includes a harmonic frequency, S / N (Signal / Noise) may deteriorate and communication quality may deteriorate. In this example, the (n + 1) th order harmonic is included in the frequency band used in the radio channel. Therefore, this harmonic can cause communication quality degradation.

  One method for preventing high-frequency interference of the clock synchronization device with respect to wireless communication is to set the clock frequency of the clock synchronization device to a frequency that does not fall within the frequency band of all wireless channels used by the communication device for communication. It is done.

  FIG. 10 is a diagram illustrating an example of the harmonics of the clock synchronization device and the frequency of the radio wave used in communication. FIG. 7 shows an example in which the clock frequency of the clock synchronization device in the example of FIG. 6 is shifted.

  In the example of FIG. 10, by shifting the clock frequency of the clock synchronization device, the (n + 1) -order harmonic is not included in the frequency band of the radio channel. In this way, by shifting the clock frequency of the clock synchronization device, it is possible to prevent harmonics from causing deterioration of the radio communication quality.

  Examples of apparatuses that reduce interference between a clock frequency or a high frequency thereof and a radio signal by switching the clock and changing the clock frequency are described in Patent Document 1 and Patent Document 2, for example.

  Patent Document 1 describes a wireless receiving device including a plurality of clocks. The wireless reception device of Patent Literature 1 switches the clock signal supply source to a clock that is predetermined for each reception frequency and does not interfere with the wireless signal, according to the reception frequency of the wireless signal.

  Patent Document 2 describes an information processing apparatus connected to a wireless module that changes an operating frequency so as not to interfere with a wireless communication frequency band of a wireless module used for wireless communication. The information processing apparatus disclosed in Patent Literature 2 acquires a wireless module ID of a wireless module attached to the information processing apparatus. The information processing apparatus reads a frequency band that is associated with the wireless module ID and can be used by the wireless module with the wireless module ID. The information processing apparatus changes the operating frequency of its own CPU to a frequency that does not interfere with the frequency band. When the operating frequency of the CPU cannot be changed to a frequency that does not interfere with the frequency band, the information processing apparatus acquires a frequency that the wireless module uses for communication. Then, the information processing apparatus changes the operating frequency of the CPU to a frequency that does not interfere with the acquired frequency.

JP 2004-32649 A JP 2002-290261 A

  Usually, the clock synchronization device has a maximum clock frequency at which the clock synchronization device can operate. From the viewpoint of processing performance, it is desirable that the clock synchronization device operates at the maximum clock frequency. However, if the harmonics of the clock frequency interfere with radio communication on any channel at the maximum clock frequency of the clock synchronization device, the clock frequency of the clock synchronization device must be lower than the maximum clock frequency to prevent interference. is there. In that case, the performance degradation of the clock synchronization device increases as the decrease in the clock frequency in changing the clock frequency of the clock synchronization device increases.

  In the techniques of Patent Documents 1 and 2, it is impossible to suppress the performance degradation of the clock synchronization device accompanying the change of the clock frequency of the clock synchronization device when avoiding interference of the clock synchronization device with respect to wireless communication.

  An object of the present invention is to provide a clock control device capable of suppressing a performance degradation of a clock synchronization device associated with a change in clock frequency of the clock synchronization device when avoiding interference of the clock synchronization device with respect to wireless communication. It is in.

  The clock control device of the present invention is connected to the radio communication device for each of a plurality of frequency bands that the radio communication device can use for radio communication without interfering with the radio communication using the frequency band. Frequency storage means for storing one or more clock frequencies of a clock signal that can be supplied to a device included in the information processing apparatus, and each of the used frequency bands that are used by the wireless communication apparatus for the wireless communication Detecting means for detecting the highest clock frequency among clock frequencies that can be supplied to the device without interfering with the wireless communication using the used frequency band for any of the used frequency bands Selecting means for selecting from the clock frequency stored in the frequency storage means, and receiving the clock frequency and receiving the clock signal of the received clock frequency. To the information processing apparatus to be supplied to the device, and a setting unit configured to transmit the clock frequency selected.

  The clock control method of the present invention is connected to the radio communication device without interfering with the radio communication using the frequency band for each of a plurality of frequency bands that the radio communication device can use for radio communication. One or more clock frequencies of clock signals that can be supplied to the devices included in the information processing apparatus are stored in the frequency storage means, and each of the used frequency bands that are the frequency bands used by the wireless communication apparatus for the wireless communication The highest clock frequency among the clock frequencies that can be supplied to the device without interfering with the wireless communication using the used frequency band for any of the used frequency bands, Select from clock frequencies stored in frequency storage means, receive the clock frequency, and supply the received clock signal of the clock frequency to the device The serial information processing apparatus, transmits the clock frequency selected.

  According to the clock control program of the present invention, the wireless communication device causes the computer to interfere with the wireless communication using the frequency band for each of a plurality of frequency bands that the wireless communication device can use for wireless communication. A frequency storage means for storing one or more clock frequencies of a clock signal that can be supplied to a device included in the information processing apparatus connected to the wireless communication apparatus, and a use frequency that is a frequency band used by the wireless communication apparatus for the wireless communication Detection means for detecting each of the bands, and for any of the used frequency bands, the highest of the clock frequencies that can be supplied to the device without interfering with the wireless communication using the used frequency band Selecting means for selecting the clock frequency from clock frequencies stored in the frequency storage means; and receiving the clock frequency and receiving the clock frequency. The clock signal of the clock frequency to the information processing apparatus to be supplied to said device, operates as a setting unit for transmitting the clock frequency selected.

  The present invention has an effect that it is possible to suppress the performance degradation of the clock synchronization device accompanying the change of the clock frequency of the clock synchronization device when avoiding the interference of the clock synchronization device with the wireless communication.

FIG. 1 is a block diagram illustrating a configuration of an information processing system 100 according to the first and second embodiments. FIG. 2 is a diagram illustrating an example of connection between the information processing system 100 and another device when the information processing system 100 is a wireless LAN router. FIG. 3 is a diagram illustrating an example of connection between the information processing system 100 and another device when the information processing system 100 is a computer device. FIG. 4 is a flowchart showing the operation of the clock control device 1 according to the first embodiment. FIG. 5 is a flowchart showing the operation of the clock control device 1 according to the second embodiment. FIG. 6 is a block diagram illustrating the configuration of the clock control device 1 according to the third embodiment. FIG. 7 is a block diagram illustrating a configuration example of a configuration of the information processing system 100 according to the first embodiment. FIG. 8 is a diagram illustrating an example of presence / absence of interference of clock signals of each clock frequency for each channel. FIG. 9 is a diagram illustrating an example of the harmonics of the clock synchronization device and the frequency of the radio wave used in communication. FIG. 10 is a diagram illustrating an example of the harmonics of the clock synchronization device and the frequency of the radio wave used in communication.

(First embodiment)
Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of an information processing system 100 according to the present embodiment.

  The information processing system 100 includes a clock control device 1, a wireless communication device 2, and an information processing device 3. The clock control device 1, the wireless communication device 2, and the information processing device 3 are connected to each other. The clock control device 1, the wireless communication device 2, and the information processing device 3 may be included in the same device.

  The information processing system 100 is, for example, a wireless LAN (Local Area Network) router. In this case, the information processing device 3 performs path control of data transmitted / received to / from other devices, for example. The wireless communication device 2 is a wireless module that communicates with other devices using wireless signals.

  FIG. 2 is a diagram illustrating an example of connection between the information processing system 100 and another device when the information processing system 100 is a wireless LAN router. The information processing system 100 is connected to the network 4 via a network interface (not shown). Further, the information processing system 100 is wirelessly connected to each terminal 5 via the wireless communication device 2. The information processing system 100 relays communication between each terminal 5 and other devices connected to the network 4.

  The information processing system 100 may be a computer device having a wireless communication function. In this case, the wireless communication device 2 is a wireless module that communicates with other devices using wireless signals. The information processing device 3 is a computer device that is connected to the wireless communication device 2 and performs wireless communication with other devices via the wireless communication device 2.

  FIG. 3 is a diagram illustrating an example of connection between the information processing system 100 and another device when the information processing system 100 is a computer device. The computer device 100 is connected to another wireless device 6. The wireless device 6 is, for example, a peripheral device of a computer that performs wireless communication with a wireless LAN router. The wireless device 6 may be a wireless station device.

  In the following, the case where the information processing system 100 is a wireless LAN router will be mainly described.

  The wireless communication device 2 communicates with other devices such as the terminal 5 in any one or more of frequency bands obtained by dividing the entire frequency range in which the wireless communication device 2 can perform communication into several numbers. In a wireless LAN, these frequency bands are called channels or wireless channels. The wireless communication device 2 may simultaneously communicate with the plurality of terminals 5 through different channels. Each channel is assigned a number for identification.

  When the wireless communication device 2 receives an inquiry about a channel being used in wireless communication from another device such as the clock control device 1, the wireless communication device 2 transmits all channel numbers being used to the device that transmitted the inquiry. To do.

  When the wireless communication device 2 receives an inquiry about the amount of data transferred in wireless communication from another device such as the clock control device 1, for example, the wireless communication device 2 inquires about the amount of transferred data for each channel in use. To the source device.

  The clock control device 1 includes a frequency storage unit 10, a detection unit 11, a selection unit 12, and a setting unit 13.

  The information processing apparatus 3 includes a device 30 and a clock supply unit 31.

  The device 30 is a clock synchronization device such as a memory or a processor that operates in synchronization with the clock supplied from the clock supply unit 31.

  The clock supply unit 31 receives the frequency of the clock supplied to the device 30 from another device such as the clock control device 1. The clock supply unit 31 supplies the received frequency clock to the device 30. The clock supply unit 31 may select a clock supply source such as an oscillation element from a plurality of clock supply sources according to the received frequency, and supply a clock signal from the selected clock supply source to the device 30. Alternatively, the clock supply unit 31 may generate a clock signal having the received frequency by a phase synchronization circuit and supply the clock signal to the device 30.

  The wireless communication apparatus 2 may be affected by the harmonics of the clock signal supplied to the device 30. A harmonic wave of the clock signal supplied to the device 30 is radiated from the device 30. Alternatively, the harmonic current of the clock signal supplied to the device 30 propagates from the device 30 to the wireless communication device 2 via a cable connecting the wireless communication device 2 and the information processing device 3. In the wireless communication device 2, when the harmonic frequency is included in the frequency band that the wireless communication device 2 uses for wireless communication, the quality of the wireless communication decreases, for example, an increase in data transfer errors or data The transfer speed is reduced. That is, interference with the radio communication of the clock signal occurs.

  The frequency storage unit 10 supplies the device 30 with the clock supply unit 31 for each of a plurality of frequency bands that the wireless communication device 2 can use for wireless communication without interfering with wireless communication using the frequency band. One or more clock frequencies of clock signals that can be stored are stored. The clock frequency stored in the frequency storage unit 10 may be a discrete numerical value or a range of clock frequencies represented by a maximum value and a minimum value. The frequency storage unit 10 associates frequency band identifiers such as channel numbers, one or more clock frequency values, and clock frequency ranges for each frequency band that the wireless communication device 2 can use for wireless communication. You just have to remember it. For example, the system designer stores the identifiers and clock frequencies of these frequency bands in the frequency storage unit 10 in advance.

  The detection unit 11 detects a use frequency band that is a frequency band used by the wireless communication device 2 for wireless communication. For example, the detection unit 11 may inquire the wireless communication device 2 about the used frequency band and acquire the used frequency band from the wireless communication device 2. The detection unit 11 may acquire these frequency bands from the information processing device 3. There may be a plurality of detection frequency bands.

  The selection unit 12 selects the highest clock frequency from among the clock frequencies that can be supplied to the device 30 without interfering with wireless communication using the used frequency band, from the clock frequencies stored in the frequency storage unit 10. When there are a plurality of used frequency bands, the selection unit 12 may select the highest clock frequency among the clock frequencies that do not interfere with all the used frequency bands.

  The setting unit 13 transmits the selected clock frequency to the clock supply unit 31 of the information processing device 3.

  Next, the operation of the clock control device 1 of the present embodiment will be described in detail with reference to the drawings.

  FIG. 4 is a flowchart showing the operation of the clock control device 1 of the present embodiment.

  In the following description, a case where the information processing system 100 is a wireless LAN router connected to the terminal 5 through any channel will be described. A plurality of terminals 5 may exist.

  The clock control device 1 starts the operation of FIG. 4 when the power is turned on, for example.

  For example, the clock control device 1 starts the operation of FIG. 4 when the wireless communication device 2 newly starts communication with the terminal 5 and when communication with the terminal 5 that has performed communication is disconnected. May be. In this case, for example, the detection unit 11 may detect the start of communication between the wireless communication device 2 and the terminal 5 and the disconnection of communication between the wireless communication device 2 and the terminal 5. In this case, the clock control device 1 may end the operation after the operations in steps S101 to S103.

  Referring to FIG. 4, first, the detection unit 11 detects a used channel that is a channel representing a frequency band used by the wireless communication device 2 for communication with the terminal 5 (step S <b> 101).

  As described above, the detection unit 11 may acquire the channel number used by the wireless communication apparatus 2 for wireless communication with the terminal 5 from the wireless communication apparatus 2. If there are a plurality of used channels, the detection unit 11 acquires all channel numbers.

  If the information processing system 100 is not a wireless LAN router, the detection unit 11 may acquire a frequency band or another identifier representing a frequency band instead of a channel. In this case, each component of the clock control device 1 may perform the operations of this embodiment and other embodiments described below on the frequency band instead of the channel.

  Next, the selection unit 12 selects the highest clock frequency that does not interfere with the wireless communication of the wireless communication device 2 (step S102).

  First, the selection unit 12 reads out, from the frequency storage unit 10, a clock frequency that does not interfere with wireless communication using the acquired channel. Then, the selection unit 12 selects the highest clock frequency among the clock frequencies that do not interfere with any of the acquired channels.

  Next, the setting unit 13 transmits the selected clock frequency to the clock supply unit 31 of the information processing device 3 (step S103).

  The clock supply unit 31 that has received the clock frequency supplies a clock signal having the received clock frequency to the device 30.

  The present embodiment described above has an effect that it is possible to suppress a decrease in performance of the clock synchronization device due to a change in the clock frequency of the clock synchronization device when avoiding interference of the clock synchronization device with respect to wireless communication. is there.

  The reason is that the selection unit 12 selects the highest clock frequency that does not interfere with the wireless communication of the wireless communication device 2 from the information on the frequency band that the wireless communication device 2 uses for wireless communication detected by the detection unit 11. is there. By transmitting the selected clock frequency to the clock supply unit 31, the setting unit 13 is supplied with a clock signal having the highest clock frequency that does not interfere with the wireless communication of the line communication device 2.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

  The configuration of the information processing system 100 of this embodiment is the same as the configuration of the information processing system 100 of the first embodiment of FIG. Below, it demonstrates focusing on the difference of the information processing system 100 of this embodiment, and the information processing system 100 of 1st Embodiment.

  The detection unit 11 detects the frequency band used by the wireless communication device 2 for wireless communication, as with the detection unit 11 of the first embodiment. The detection unit 11 may acquire the channel number representing the frequency band in use from the wireless communication device 2. The detection unit 11 may acquire the numbers of these channels from the information processing device 3. The detection unit 11 further measures the amount of data transferred in wireless communication using the frequency band corresponding to the channel for each channel used by the wireless communication device 2 for wireless communication. And the detection part 11 detects each of the channels whose data amount transferred in the past predetermined time is more than a predetermined value as a use channel showing a use frequency band. The detection unit 11 may acquire the amount of data transferred from the wireless communication apparatus 2 within each past predetermined time in each frequency band. In this case, the wireless communication device 2 measures the amount of transferred data in each frequency band. Then, the wireless communication device 2 transmits the amount of data transferred in the past predetermined time to the detection unit 11. The detection unit 11 may acquire the amount of data transferred from the information processing device 3 in the past predetermined time in each frequency band. In this case, the information processing device 3 measures the amount of transferred data in each frequency band. Then, the information processing device 3 transmits the amount of data transferred within the past predetermined time to the detection unit 11.

  Except for the above points, each component of the information processing system 100 according to the present embodiment performs the same operation as the component having the same number included in the information processing system 100 according to the first embodiment, and thus the description thereof is omitted. .

  Next, the operation of the clock control device 1 of the present embodiment will be described in detail with reference to the drawings.

  FIG. 5 is a flowchart showing the operation of the clock control device 1 of the present embodiment.

  Comparing FIG. 5 and FIG. 2, the clock control device 1 of the present embodiment is different in that it performs the operations of Step S201 to Step S203 instead of the operation of Step S101.

  In step S201, the detection unit 11 first detects a channel in use in the wireless communication of the wireless communication device 2 (step S201). The method of detecting the channel in use in the wireless communication of the wireless communication device 2 is the same as the detection method in the operation of step S101 in FIG.

  Next, the detection unit 11 detects the amount of data transferred in the past predetermined time in each channel being used in the wireless communication of the wireless communication device 2 (step S201).

  As described above, the detection unit 11 acquires the amount of data transferred in the past predetermined time for each channel from the wireless communication device 2 or the information processing device 3.

  Then, the detection unit 11 compares the amount of data transferred in the past predetermined time with a predetermined threshold for each channel being used in the wireless communication of the wireless communication device 2. For example, the designer of the information processing system 100 may set this threshold value in advance. Alternatively, the user of the information processing system 100 may set this threshold value via input means such as a keyboard (not shown).

  The detection unit 11 detects a channel being used in the wireless communication of the wireless communication device 2 in which the amount of data transferred in the past predetermined time exceeds a predetermined threshold as a used channel (step S203).

  Steps S102 and S103 are the same as steps S102 and S103 in FIG.

  In the present embodiment described above, it is possible to further suppress the performance degradation of the clock synchronization device due to the change of the clock frequency of the clock synchronization device when avoiding interference of the clock synchronization device with respect to wireless communication. effective.

  The reason is that, among the channels that are used by the wireless communication device 2 in wireless communication, the detection unit 11 selects a channel in which the amount of data transferred within a predetermined time in wireless communication using the channel exceeds a predetermined threshold. This is because it is detected as a used channel.

  In a channel where the amount of data transferred in the past predetermined time is small, even if the wireless communication device 2 is connected to the terminal 5, the amount of data transferred by wireless communication is expected to be small. Therefore, even if the interference of the clock signal with the wireless communication using the channel occurs, the influence on the wireless communication due to the interference is small.

  The frequency range of the clock signal that can be supplied to the device 30 is widened by avoiding interference with the radio communication only for the channel that has a great influence when the interference occurs. Therefore, in this case, there is a possibility that a clock signal having a higher frequency can be supplied to all channels including a channel that is less affected by interference than when interference is avoided.

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 6 is a diagram illustrating the configuration of the clock control device 1 of the present embodiment.

  Referring to FIG. 6, the clock control device 1 of the present embodiment does not interfere with the wireless communication using the frequency band for each of a plurality of frequency bands that the wireless communication device 2 can use for wireless communication. In addition, a frequency storage unit 10 that stores one or more clock frequencies of a clock signal that can be supplied to the device 30 included in the information processing device 3 connected to the wireless communication device 2, and the wireless communication device 2 includes the wireless communication The detecting unit 11 that detects each of the used frequency bands that are the frequency bands that are used for the above-mentioned, without interfering with the wireless communication that uses the used frequency band for any of the used frequency bands, Of the clock frequencies that can be supplied to the device 30, the selection unit 12 that selects the highest clock frequency from the clock frequencies stored in the frequency storage unit 10, and the clock frequency Receiving, in the information processing apparatus 3 supplies the clock signal of the clock frequency received on the device, and a setting unit 13 for transmitting the clock frequency selected.

  The present embodiment described above has the same effect as the first embodiment.

(Configuration example)
Next, a configuration example based on the first embodiment will be described in detail with reference to the drawings.

  FIG. 7 is a diagram illustrating the configuration of the information processing system 100 according to this configuration example. In this configuration example, the information processing system 100 is a wireless LAN router.

  In this configuration example, the device 30 is a RAM (Random Access Memory) 30A, a CPU 30B, and a ROM (Read Only Memory) 30C. The clock supply unit 31 supplies clock signals that are not necessarily the same to the RAM 30A, the CPU 30B, and the ROM 30C. The RAM 30A is, for example, an SDRAM (Synchronous Dynamic Random Access Memory).

  Hereinafter, a case where the clock control device 1 sets the frequency of the clock signal supplied from the clock supply unit 31 to the SDRAM 30A will be described. The clock control device 1 may set the clock signal supplied to the CPU 30B, the ROM 30C, and another device 30 (not shown) by the same method.

  The frequency storage unit 10 stores information indicating the presence or absence of interference of a clock signal having a clock frequency that can be supplied to the SDRAM 30A for wireless communication in each channel.

  FIG. 8 is a diagram illustrating an example of presence / absence of interference of clock signals of each clock frequency stored in the frequency storage unit 10 for each channel. SDRAM_CLK (Clock) in FIG. 8 represents the clock frequency of the clock signal supplied to the SDRAM 30A. In the example of FIG. 8, the new wireless communication device 2 can use six channels 1 to 6. The clock supply unit 31 can supply a clock signal having a clock frequency in increments of 5 MHz from 400 MHz (Mega Heltz) to 370 MHz to the SDRAM 30A. The number of channels and the clock frequency are not limited to the above, and may be determined according to the specifications of the wireless communication device 2, the SDRAM 30A, the clock supply unit 31, the CPU 30B that accesses the SDRAM 30A, and peripheral circuits.

  The circles in FIG. 8 indicate that there is no interference. 8 indicates that there is interference. For example, SDRAM_CLK that does not interfere with channel 1 is 400 MHz, 390 MHz, 380 MHz, 375 MHz, and 370 MHz. The frequency storage unit 10 may store, for each channel, a bit string or a byte string in which ○ or × in FIG. 8 is associated with a value such as 1 or 0. The frequency storage unit 10 may store a numerical value of a frequency corresponding to a circle in FIG. 8 for each channel.

  In the wireless LAN router 100 in the initial state immediately after the power is turned on and activated, the clock supply unit 31 supplies a clock signal of 400 MHz, which is the highest clock frequency that can be supplied, to the SDRAM 30A.

  The operation of the wireless LAN router 100 when the terminal 5 performing wireless communication is connected to the wireless LAN router 100 to which the terminal 5 is not connected through the channel 2 is as follows.

  When the terminal 5 is connected to the wireless LAN router 100, a wireless channel to be used is set. The radio channel setting method may be any existing method. As a wireless channel setting method, for example, a user uses an input device such as a keyboard or a mouse with respect to the information processing device 3 of the wireless LAN router 100 using a GUI (Graphical User Interface) or a CLI (Command Line Interface). Then, enter the channel number and set it. As a wireless channel setting method, there is also a method in which the information processing device 3 of the wireless LAN router 100 detects a wireless channel that is least congested and sets a channel used by a newly connected terminal 5 as the channel.

  When the channel used for communication with the newly connected terminal 5 is set to 2, the information processing apparatus 3 notifies the wireless communication apparatus 2 that the channel used for communication with the terminal 5 is 2 To do. The wireless communication device 2 notifies the clock control device 1 that the terminal 5 is newly connected and the channel used is 2. The information processing apparatus 3 may make this notification.

  For example, the detection unit 11 detects the use channel when notified that the terminal 5 is newly connected and the use channel is 2 (step S101 in FIG. 2).

  Next, the selection unit 12 reads from the frequency storage unit 10 the highest clock frequency among the clock frequencies that do not interfere with the wireless communication of the channel 2 that is the used channel. Since only the channel 2 is used, the clock frequencies that do not interfere with wireless communication are 390 MHz, 385 MHz, 380 MHz, and 370 MHz. The selection unit 12 selects 390 MHz as the highest clock frequency that does not interfere with the wireless communication of channel 2 (step S102 in FIG. 2).

  The setting unit 13 transmits an instruction to change the clock frequency of the clock signal supplied to the SDRAM 30A to 390 MHz to the clock supply unit 31 of the information processing device 3 (step S103 in FIG. 2). The clock supply unit 31 only needs to be configured to set the clock frequency of the clock signal to be supplied to the received clock frequency. In that case, the setting unit 13 transmits 390 MHz, which is the selected clock frequency, to the clock supply unit 31. The clock supply unit 31 changes the clock frequency of the supplied clock signal to 390 MHz. .

  The operation of the wireless LAN router 100 when the terminal 5 is connected to the above-described wireless LAN router 100 connected to the channel 2 via the channel 4 is as follows.

  When the number of channels used for communication with the newly connected terminal 5 is 4, the information processing apparatus 3 notifies the wireless communication apparatus 2 that the number of channels used for communication with the terminal 5 is 4. The wireless communication device 2 notifies the clock control device 1 that the terminal 5 is newly connected and its use channel is 4. The information processing apparatus 3 may make this notification. The detection unit 11 may store a channel used by the terminal 5 that is already connected to the wireless communication apparatus 2 and may acquire only a used channel of the terminal 5 that is newly connected.

  In this case, the detecting unit 11 detects the used channel by notifying that the terminal 5 is newly connected and that the used channel is 4, (step S101 in FIG. 2).

  The wireless communication device 2 or the information processing device 3 may transmit all the channels used by the connected terminal 5 to the detection unit 11. In that case, the detection unit 11 detects all received channels as used channels.

  Next, the selection unit 12 reads the highest clock frequency from the frequency storage unit 10 among the clock frequencies that do not interfere with the wireless communication of the channel 2 and the channel 4 that are used channels. Clock frequencies that do not interfere with both channel 2 and channel 4 wireless communications are 385 MHz, 380 MHz, and 370 MHz. The selection unit 12 selects 385 MHz as the highest clock frequency that does not interfere with both channel 2 and channel 4 wireless communications (step S102 in FIG. 2).

  The setting unit 13 transmits an instruction to change the clock frequency of the clock signal supplied to the SDRAM 30A to 385 MHz to the clock supply unit 31 of the information processing device 3 (step S103 in FIG. 2). The setting unit 13 may transmit 385 MHz that is the selected clock frequency to the clock supply unit 31. The clock supply unit 31 changes the clock frequency of the supplied clock signal to 385 MHz.

  Further, the operation of the wireless LAN router 100 when the communication of the terminal 2 of the channel 2 is disconnected from the wireless LAN router 100 in which the two terminals 5 are connected by the channel 2 and the channel 4 is as follows. It is.

  When communication between the terminal 5 connected to the channel 2 and the wireless communication device 2 is disconnected, the wireless communication device 2 informs the information processing device 3 that communication with the terminal 5 connected to the channel 2 has been disconnected. Notice. The wireless communication device 2 or the information processing device 3 notifies the detection unit 11 that communication with the terminal 5 connected with the channel 2 out of the two terminals 5 connected with the channel 2 and the channel 4 is disconnected. Notice. When the detection unit 11 stores a channel used by the terminal 5 connected to the wireless communication device 2, the wireless communication device 2 or the information processing device 3 can communicate with the terminal 5 connected through the channel 2. What is necessary is just to notify the detection part 11 that it disconnected. Otherwise, the wireless communication device 2 or the information processing device 3 may notify the detection unit 11 that the channel used by the terminal 5 connected to the wireless communication device 2 is 4.

  The detection unit 11 detects that the used channel of the terminal 5 connected to the wireless communication device 2 is 4, for example, based on the above notification (step S101 in FIG. 2).

  Next, the selection unit 12 reads from the frequency storage unit 10 the highest clock frequency among the clock frequencies that do not interfere with the wireless communication of the channel 4 that is the used channel. The clock frequencies that do not interfere with channel 4 wireless communication are 400 MHz, 385 MHz, 380 MHz, 375 MHz, and 370 MHz. The selection unit 12 selects 400 MHz as the highest clock frequency that does not interfere with the wireless communication of the channel 4 (step S102 in FIG. 2).

  The setting unit 13 transmits an instruction to change the clock frequency of the clock signal supplied to the SDRAM 30A to 400 MHz to the clock supply unit 31 of the information processing device 3 (step S103 in FIG. 2). The setting unit 13 may transmit 400 MHz that is the selected clock frequency to the clock supply unit 31. The clock supply unit 31 changes the clock frequency of the supplied clock signal to 400 MHz.

  The clock control device 1, the wireless communication device 2, and the information processing device 3 are each realized by a computer and a program for controlling the computer, dedicated hardware, or a combination of the computer and the computer control program and dedicated hardware. be able to.

  The detection unit 11, the selection unit 12, the setting unit 13, and the clock supply unit 31, for example, read a dedicated program for realizing the function of each unit read from a recording medium storing the program into the memory and execute the program Can be realized by a processor. Further, the frequency storage unit 10 can be realized by a memory or a hard disk device included in a computer. Alternatively, part or all of the frequency storage unit 10, the detection unit 11, the selection unit 12, the setting unit 13, the device 30, and the clock supply unit 31 can be realized by a dedicated circuit that realizes the function of each unit.

  The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Clock control apparatus 2 Wireless communication apparatus 3 Information processing apparatus 4 Network 5 Terminal 6 Wireless equipment 10 Frequency storage part 11 Detection part 12 Selection part 13 Setting part 30 Device 30A RAM
30B CPU
30C ROM
31 Clock supply unit 100 Information processing system

Claims (7)

A device included in an information processing apparatus connected to the wireless communication apparatus without interfering with the wireless communication using the frequency band for each of a plurality of frequency bands that the wireless communication apparatus can use for wireless communication. Frequency storage means for storing one or more clock frequencies of clock signals that can be supplied;
Detecting means for detecting each of the used frequency bands, which is a frequency band used by the wireless communication device for the wireless communication;
For any of the used frequency bands, the frequency storage means sets the highest clock frequency among clock frequencies that can be supplied to the device without interfering with the wireless communication using the used frequency band. Selecting means for selecting from the clock frequency to be stored;
A clock control apparatus comprising: setting means for receiving the clock frequency and transmitting the selected clock frequency to the information processing apparatus that supplies the received clock signal of the clock frequency to the device. The detecting means further measures, for each frequency band used by the wireless communication apparatus for the wireless communication, a data amount transferred in the wireless communication using the frequency band, The clock control device according to claim 1, wherein each of the frequency bands in which the amount of data transferred in time is equal to or greater than a predetermined value is detected as the use frequency band.   An information processing system including the wireless communication device, the clock control device according to claim 1, and the information processing device. A device included in an information processing apparatus connected to the wireless communication apparatus without interfering with the wireless communication using the frequency band for each of a plurality of frequency bands that the wireless communication apparatus can use for wireless communication. One or more clock frequencies of clock signals that can be supplied are stored in the frequency storage means,
The wireless communication device detects each used frequency band that is a frequency band used for the wireless communication,
For any of the used frequency bands, the frequency storage means sets the highest clock frequency among clock frequencies that can be supplied to the device without interfering with the wireless communication using the used frequency band. Select from the clock frequency to memorize,
A clock control method that receives the clock frequency and transmits the selected clock frequency to the information processing apparatus that supplies the received clock signal of the clock frequency to the device. Further, for each frequency band used for the wireless communication by the wireless communication device, the amount of data transferred in the wireless communication using the frequency band is measured, and transferred in a past predetermined time. The clock control method according to claim 4, wherein each of the frequency bands having a data amount equal to or greater than a predetermined value is detected as the use frequency band. Computer
A device included in an information processing apparatus connected to the wireless communication apparatus without interfering with the wireless communication using the frequency band for each of a plurality of frequency bands that the wireless communication apparatus can use for wireless communication. Frequency storage means for storing one or more clock frequencies of clock signals that can be supplied;
Detecting means for detecting each of the used frequency bands, which is a frequency band used by the wireless communication device for the wireless communication;
For any of the used frequency bands, the frequency storage means sets the highest clock frequency among clock frequencies that can be supplied to the device without interfering with the wireless communication using the used frequency band. Selecting means for selecting from the clock frequency to be stored;
A clock control program that receives the clock frequency and causes the information processing apparatus that supplies the received clock signal of the clock frequency to the device to operate as a setting unit that transmits the selected clock frequency. Computer
Further, for each frequency band used for the wireless communication by the wireless communication device, the amount of data transferred in the wireless communication using the frequency band is measured, and transferred in a past predetermined time. The clock control program according to claim 6, wherein each of the frequency bands having a data amount equal to or larger than a predetermined value is operated as the detection unit that detects the frequency band as the use frequency band.

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