WO2018221238A1 - 無線機器および無線機器の処理方法 - Google Patents
無線機器および無線機器の処理方法 Download PDFInfo
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- WO2018221238A1 WO2018221238A1 PCT/JP2018/019081 JP2018019081W WO2018221238A1 WO 2018221238 A1 WO2018221238 A1 WO 2018221238A1 JP 2018019081 W JP2018019081 W JP 2018019081W WO 2018221238 A1 WO2018221238 A1 WO 2018221238A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
Definitions
- This technology relates to a wireless device and a processing method of the wireless device.
- the condition that the system clocks are synchronized with the other device connected wirelessly is that the device clocks of the two devices can be synchronized, or the deviation of the clocks of each other can be grasped with high accuracy and synchronization can be achieved by conversion And that the reflection processing of the device clock and the system clock has been completed in each device.
- the purpose of this technology is to efficiently convey to the counterpart device whether the synchronization target clock has been correctly synchronized with the counterpart device.
- a main control unit whose time is managed by a first clock;
- a wireless control unit whose time is managed by a second clock;
- a clock synchronization management unit that manages the status of clock synchronization is provided in the wireless device that notifies other wirelessly connected wireless devices of information regarding the status of clock synchronization by transmitting a frame.
- the wireless device includes a main control unit, a wireless control unit, and a clock synchronization management unit.
- the main control unit manages the time with the first clock.
- the radio control unit manages the time with the second clock.
- the synchronization management unit manages the status of clock synchronization. Information on the status of clock synchronization is notified to other wireless devices connected wirelessly by transmission of frames.
- the information regarding the status of the clock synchronization may include information indicating the synchronization status.
- the synchronization status may have two statuses: synchronized and not synchronized, or three statuses synchronized, unsynchronized and the synchronization criteria are severely out of sync. May be.
- the clock synchronization management unit determines that the clock is synchronized when the absolute value of the clock difference between the first clock and the second clock within a predetermined time is equal to or smaller than the second threshold. , May be.
- the clock synchronization management unit has the absolute value of the clock difference between the first clock and the second clock within the predetermined time being equal to or smaller than the second threshold and the second clock within the predetermined time.
- the absolute value of the offset with another wireless device is equal to or less than the first threshold value, it may be determined that synchronization is established.
- the clock synchronization management unit may determine that the synchronization reference is severe and synchronization is impossible when the state of non-synchronization continues for a predetermined time.
- the information regarding the status of the clock synchronization may further include a reference for determining the synchronization status.
- the information related to the clock synchronization status may further include information on the frame transmission failure rate.
- the information related to the clock synchronization status may further include information on the amount of wireless traffic.
- the information on the status of clock synchronization may further include information on clock drift between the second clock and another wireless device.
- the wireless control unit transmits association information of the first clock and the second clock to another wireless device by transmitting a frame, and the association information includes difference information of the two clocks. It may be included.
- the association information may further include granularity ratio information of two clocks.
- the wireless control unit may transmit information regarding the status of clock synchronization as part of a frame for measuring the time of the wireless control unit with another wireless device.
- a display unit that displays a user interface based on information related to the status of clock synchronization may be further provided.
- the clock synchronization management unit requests the user to determine on the display unit whether or not the synchronization completion criterion used in the own station may be relaxed when the state of non-synchronization continues for a predetermined time. When the user interface is displayed and the user permits relaxation, the synchronization reference may be changed.
- the wireless control unit notifies other wireless devices that are wirelessly connected to information on the state of clock synchronization by transmitting a frame. For this reason, it is possible to efficiently notify the counterpart device whether the synchronization target clock has been correctly synchronized.
- a main control unit whose time is managed by a first clock;
- a wireless control unit for managing time by a second clock;
- the wireless control unit detects information about the clock synchronization status from other wirelessly connected wireless devices by receiving a frame,
- the wireless device further includes a display unit that displays a user interface based on information on the clock synchronization status.
- the wireless device includes a main control unit and a wireless control unit.
- the main control unit manages the time with the first clock.
- the radio control unit manages the time with the second clock.
- Information regarding the clock synchronization status is detected by receiving a frame from another wirelessly connected wireless device.
- the display unit displays a user interface based on information on the status of clock synchronization. For example, an application unit that performs processing based on the first clock may be further included.
- the information regarding the status of clock synchronization may include synchronization status information.
- the synchronization status may have two statuses: synchronized and not synchronized, or three statuses synchronized, unsynchronized and the synchronization criteria are severely out of sync. May be.
- the display unit determines whether the synchronization reference with other wireless devices may be relaxed.
- the wireless control unit transmits the relaxation of the synchronization reference to the other wireless device by transmitting a frame. It may be made like.
- the wireless control unit detects information on the clock synchronization status from other wirelessly connected wireless devices by receiving a frame, and displays a user interface based on the information. Therefore, it is possible to appropriately notify the user of the status of clock synchronization.
- FIG. 1 It is a figure which shows the operation
- FIG. 2 is a block diagram illustrating a configuration example of a wireless system when audio synchronized playback is performed by a plurality of audio devices. It is a block diagram which shows the structural example of the radio
- Embodiment> “Description of Reference Standards” The standard to be referred will be described.
- the IEEE 1588 standard “1588-2008-IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems” is defined as a correction method for performing high-accuracy time synchronization between devices.
- the protocol of this standard is also called PTP (Precision Time Protocol).
- FIG. 1 shows an outline of PTP operation. Although detailed explanation is omitted, using the time in FIG. 1, the time lag between the master and the slave is expressed by the following formula (1).
- the PTP method is the 802.1AS standard "802.1AS-2011--IEEE-Standard-for-Local-and-Metropolitan-Area-Networks--Timing-and-Synchronization-for-Time-Sensitive" Applications in Bridged Local Area Networks ”is defined.
- the master clock selection algorithm and the clock relay method that do not depend on the lower-layer communication method, and some lower-layer communication methods, the time lag can be further improved.
- Each interface is defined to provide a dedicated measurement mechanism for calculation.
- An FTM based on the concept of PTP as a protocol for performing high-precision synchronization (time shift detection) between wireless devices when an IEEE 802.11 wireless LAN is used as a lower-layer communication method combined with the 802.1AS standard.
- (Fine Timing Measurement) protocol is defined in the 802.11-2016 standard.
- FIG. 2 shows an outline of the operation of the FTM protocol.
- the time lag between the master (Responder in FIG. 2) and the slave (Slave, Initiator in FIG. 2) can be similarly obtained by replacing t1 to t4 with t1_1 to t1_4 in the above equation (1). .
- FIG. 3 shows a format of an FTM action frame which is a measurement frame for measuring the time of the wireless control unit in FIG. 2 with other wireless devices.
- the portion corresponding to the payload of the FTM action frame is after the “Dialog Token” field.
- the “Dialog Token” field and the “Follow Up Dialog Token” field are indexes for associating FTM action frames transmitted a plurality of times.
- the “Follow Up Dialog Token” field indicates to which FTM action frame the previously transmitted “ToD” field and “ToA” field correspond to.
- time information (time stamp) corresponding to t1_1 and t4_1 in FIG. 2 is described as a value of 48 bits in units of picoseconds.
- time stamp time stamp
- ToD Error information indicating the maximum error between the time stamp of “ToD” and the time stamp of “ToA” is entered.
- FIG. 3 shows a format when the FTM protocol is used alone, but an extended FTM action frame is used when the 802.1AS standard and the 802.11 FTM protocol are used in combination.
- FIG. 4 shows the format. There is a newly added vendor specific element (Vendor Specific Element). The purpose of this element is to carry information necessary for relay transmission of the time of another Grand Master clock.
- Vendor Specific Element The purpose of this element is to carry information necessary for relay transmission of the time of another Grand Master clock.
- FIG. 5 shows a configuration example of the wireless system 10 as an embodiment.
- the wireless system 10 includes a wireless device 100A and a wireless device 100B.
- the wireless device 100A is a clock master (Clock Master) wireless device A
- the wireless device 100B is a clock slave (Clock Slave) wireless device B.
- the wireless devices 100A and 100B each include a main control unit 101, a wireless control unit 102, and a display unit 103.
- the main control unit 101 is a part corresponding to the host processor of the device, and mainly performs communication protocol processing above the network layer, such as execution of application programs, control of input / output signals of the media interface, and clock synchronization management. Examples of media interface input / output include control of audio and video output timing as well as input of operation signals.
- the radio control unit 102 mainly adds and analyzes data link layer headers for higher layer packets generated by the main control unit 101, modulation / demodulation, error correction coding and decoding, amplification, and the like in communication layers below the data link layer. It is a functional block responsible for all functions of the wireless protocol. In general, the wireless control unit 102 is a device independent of the main control unit 101, and is connected to the main control unit 101 via some I / O port.
- the display unit 103 is used to perform display when prompting the user for input, display for prompting the user's judgment (user interface display), or the like. Note that the display unit 103 does not necessarily have to be included in the wireless devices 100A and 100B, and may be realized by a separate display device connected to the wireless devices 100A and 100B by wire or wirelessly.
- the wireless devices 100A and 100B have a system clock (synchronization target clock).
- the system clock is a clock for managing the time of the main control unit 101, and is managed and referred to by the main control unit 101.
- the wireless control unit 102 has a device clock (reference clock).
- the device clock is a clock for managing the time of the wireless control unit 102, and is managed and referenced by the wireless control unit 102.
- the device clock Is used. In the configuration example of FIG. 5, an example in which there is one clock slave radio device is shown, but an example in which there are two or more clock slave radio devices is also conceivable.
- FIG. 6 to 8 show configuration examples of the wireless system 10 that embodies an application using clock synchronization.
- FIG. 6 shows a configuration example in the case where the shutter timings of a plurality of imaging devices are synchronized.
- FIG. 7 shows a configuration example in the case of performing audio synchronized playback with a plurality of audio devices.
- FIG. 8 shows a configuration example in the case of performing distance measurement using sound waves using a speaker and a microphone.
- the system clock synchronization target clock
- (A) System clock ⁇ device clock synchronization process (in wireless device A) This process is a process of reflecting the time of the system clock in the device clock on the side of the wireless device A (wireless device 100A) that is the master device.
- FIG. 10 shows a processing flow.
- the main control unit 101 reads a device clock count on the wireless control unit 102 side. (2) Next, the main control unit 101 reads the count of the system clock. (3) Next, the main control unit 101 calculates the clock difference after aligning the granularity of the device clock and the system clock, that is, the unit.
- the main control unit 101 performs correction processing for improving accuracy with respect to the clock difference. For example, the delay of the interface between the main control unit 101 and the wireless control unit 102 and the processing delay are estimated by prior measurement, and processing for eliminating this influence in advance is performed. This correction process is performed as necessary, and may not be performed.
- the main control unit 101 reflects the clock difference as a correction value in the device clock of the wireless control unit 102 and corrects the count of the device clock.
- the way to reflect is overwriting the clock count value directly, dividing it several times while applying some kind of filter, or gradually adjusting it by adjusting how the clock count advances, Etc.
- the main control unit 101 uses the clock difference calculated in (3) as input information for knowing the state of synchronization between the device clock (reference clock) in the device and the system clock (synchronization target clock). A series of past fixed periods is monitored and held. This information is used in (d) synchronization status management processing described later.
- (B) Synchronization between device clocks (between wireless device A and wireless device B)” This process is a process of synchronizing the device clocks of the wireless device A (wireless device 100A) as the master device and the wireless device B (wireless device 100B) as the slave device.
- FIG. 11 shows a processing flow.
- This processing basically conforms to the FTM protocol of FIG. 2, but adopts formats with extension fields shown in FIGS. 12 and 13 for the formats of the FTM request frame and the FTM action frame, respectively.
- the wireless control units 102 of the wireless device A and the wireless device B respectively generate system clocks in their own devices when generating FTM request frames and FTM action frames (hereinafter referred to as “notification frames”).
- Notification frames Information on the synchronization status between the device clock and the device clock is stored in the notification frame.
- information indicating the status of “synchronized” or “not synchronized” is stored in the “Target Clock Sync Status” field as information indicating the synchronization status. Also, information on the condition determined as “synchronized” or “not synchronized” is stored in the “Used Sync Criteria” field. Also, information that explicitly indicates what the synchronization target clock is is stored in the field “Target Clock Identifier”. In this embodiment, it is indicated that the synchronization target clock is a system clock. It should be noted that a value other than “0” is entered in the “Type” field to ensure compatibility with the format shown in FIG.
- the wireless control unit 102 of the wireless device A and the wireless device B executes the processing (FTM protocol) shown in FIG. 11.
- FTM protocol processing
- the extension fields (“Vender Specific Field of FIGS. 12 and 13) are received.
- the information on the synchronization status in the counterpart wireless device described in the field “)” is saved and updated each time it is received.
- the wireless control unit 102 of the wireless device B receives the FTM action frame “FTM_2 (t1_1, t4_1) from the wireless control unit 102 of the wireless device A, and transmits an ACK frame corresponding to the FTM action frame to the wireless control unit 102 of the wireless device A. After that, the offset between the master and slave device clocks is calculated, although the detailed description is omitted, the offset calculation method is the same as that of the FTM protocol. The wireless control unit 102 corrects the device clock count.
- the first is a method of directly updating the counter value and speed (frequency) of the device clock counter. This requires that the hardware and firmware allow this.
- the counter is not operated directly, and a correction value for conversion that compensates for the offset is held separately, and when the device clock is read out, the converted value is returned and corrected apparently. It is a method to form. This method can be applied even when the counter cannot be rewritten directly and the counter is free-running.
- the information on the calculated offset is monitored and held as a series of information for knowing the status of device clock synchronization between devices. This information is used in (d) synchronization status management processing described later.
- the calculated offset itself is increasing in absolute value. Therefore, the calculated converted value is not the calculated offset itself.
- the offset amount with respect to the clock value converted according to is monitored and held.
- FIG. 14 shows a processing flow. Basically, an equivalent operation in the opposite direction to the above-described “(a) system clock ⁇ device clock synchronization processing” is performed.
- the main control unit 101 reads the count of the system clock. (2) Next, the main control unit 101 reads the device clock count on the wireless control unit 102 side. (3) Next, the main control unit 101 calculates a clock difference between the device clock and the system clock.
- the main control unit 101 performs correction processing for improving accuracy with respect to the clock difference. For example, the delay of the interface between the main control unit 101 and the wireless control unit 102 and the processing delay are estimated by prior measurement, and processing for eliminating this influence in advance is performed. This correction process is performed as necessary, and may not be performed.
- the main control unit 101 reflects the clock difference as a correction value in the system clock and corrects the count of the system clock.
- the way to reflect is overwriting the clock count value directly, dividing it several times while applying some kind of filter, or gradually adjusting it by adjusting how the clock count advances, Etc.
- the main control unit 101 uses the clock difference calculated in (3) as input information for knowing the state of synchronization between the device clock (reference clock) in the device and the system clock (synchronization target clock). A series of past fixed periods is monitored and held. This information is used in (d) synchronization status management processing described later.
- (D) Synchronization status management process (in wireless device A, wireless device B)” This process is performed in parallel with the processes (a) to (c) described above on both the wireless device A (wireless device 100A) side which is the master device and the wireless device B (wireless device 100B) side which is the slave device. This process is performed. In this embodiment, it is assumed that the synchronization status management process is performed by the main control unit 101.
- FIG. 15 shows a processing flow of the synchronization status management process.
- the processing cycle according to this processing flow is set according to how often the synchronization status is to be confirmed, and varies depending on the request of the application using the synchronization confirmation result. It is set to 5 s.
- the main control unit 101 starts processing in step ST1. Thereafter, in step ST2, the main control unit 101 performs an intra-station synchronization completion determination process.
- This intra-station synchronization completion processing is processing for determining whether or not the system clock (synchronization target clock) within the own station is sufficiently synchronized with the device clock (reference clock).
- wireless device 100B wireless device B
- a process for determining whether or not the device clock (reference clock) is sufficiently synchronized with the master side is also added to this intra-station synchronization completion process.
- FIG. 16 shows a process flow of the intra-station synchronization completion determination process.
- the main control unit 101 starts processing. Thereafter, in step ST12, the main control unit 101 determines whether or not the own station is a slave device. When it is a slave device, the main control unit 101 moves to the process of step ST13.
- step ST13 the main control unit 101 determines whether the device clock is sufficiently synchronized with the master side.
- the criterion for this determination is that the absolute value of the offset of the device clock with respect to the master is within a first threshold (corresponding to the required synchronization accuracy between device clocks) for a fixed time. This fixed time is automatically set according to the application using the synchronization confirmation result or arbitrarily set by the user, for example.
- step ST14 When determining that the device clock is sufficiently synchronized with the master side, the main control unit 101 proceeds to the process of step ST14.
- the slave device is not a slave device in step ST12
- the main control unit 101 immediately moves to the process of step ST14. Since the master device treats the device clock error between devices as always zero, the process of step ST13 is skipped.
- step ST14 the main control unit 101 determines whether the system clock in the own station is sufficiently synchronized with the device clock.
- the criterion for this determination is that the absolute value of the clock difference between the system clock and the device clock falls within the second threshold (corresponding to the required synchronization accuracy between the system clock and device clock in the device) for a certain period of time.
- This fixed time is automatically set according to the application using the synchronization confirmation result or arbitrarily set by the user, for example.
- the main control unit 101 When determining that the system clock in the own station is sufficiently synchronized with the device clock, the main control unit 101 updates the synchronization status in the own station to “synchronized” in step ST5. After the process of step ST15, the main control unit 101 ends the process in step ST16.
- step ST13 when it is not determined in step ST13 that the device clock is sufficiently synchronized with the master side, or when it is not determined in step ST14 that the system clock in the own station is sufficiently synchronized with the device clock, the main control unit 101 performs step ST17. , The own station synchronization status is updated to “not synchronized”. After the process in step ST17, the main control unit 101 ends the process in step ST16.
- step ST ⁇ b> 3 the main control unit 101 determines that the in-station synchronization status, that is, the status of “synchronized” or “not synchronized” indicates the notification frame (see FIGS. 12 and 13). Written in the "Target Clock Sync Status" field. Also.
- the first threshold which is a condition for determining the accuracy of synchronization between device clocks, is stored in the “Inter-device sync accuracy” field of the notification frame, and the device clock and system are entered in the “Intra-device Sync accuracy” field.
- a second threshold value that is a determination condition for synchronization accuracy between clocks is stored.
- step ST4 the main control unit 101 performs an intra-station synchronization completion determination process.
- the status of “synchronized” is set as the synchronization status written in the “Target Clock Sync Status” field of the notification frame received from the partner station (see FIGS. 12 and 13). It is determined whether or not is written.
- FIG. 17 shows the processing flow of the intra-station synchronization completion determination process.
- the main control unit 101 starts processing. Thereafter, in step ST22, the main control unit 101 determines whether or not the information in the “Target Clock Sync Status” field received from the connection partner station is “synchronized” status.
- the main control unit 101 When determining that the status is “synchronized”, the main control unit 101 updates the synchronization status in the partner station to a status “synchronized” in step ST23. After the process of step ST23, the main control unit 101 ends the process in step ST24. Further, when determining that it is “not synchronized” in step ST22, the main control unit 101 updates the synchronization status in the partner station to a status “not synchronized” in step ST25. After the process of step ST25, the main control unit 101 ends the process in step ST24.
- step ST ⁇ b> 5 the main control unit 101 determines whether both the own station synchronization status and the other station synchronization status are “synchronized” statuses. When determining that the statuses are not “synchronized”, the main control unit 101 determines that the partner station and the system clock (synchronization target clock) are not synchronized with each other, and returns to the process of step ST2.
- the main control unit 101 determines that the partner station and the system clock (synchronization target clock) can be synchronized with each other, and if necessary, in step ST6 To notify the application and use it for synchronization. For example, in the above-described example of shutter timing synchronization, notification that the shutter is ready is notified, in the above-described example of audio playback synchronization, notification of completion of playback preparation is provided, and in the above-described example of sound wave distance measurement, distance measurement is performed. This means notification of completion of preparation for sound wave reproduction. After the process in step ST6, the main control unit 101 returns to the process in step ST2.
- FIG. 18 shows a processing flow in that case.
- the synchronization status management process shown in FIG. 15 is performed in each of the wireless device 100A (wireless device A) and the wireless device 100B (wireless device B). Therefore, each of the wireless device 100A (wireless device A) and the wireless device 100B (wireless device B) can efficiently know whether or not the system clock (synchronization target clock) has been correctly synchronized with the counterpart station. Information can be used effectively.
- a second embodiment will be described.
- the second embodiment is an example in which more information is supplied than in the first embodiment and finer control is possible.
- the correspondence between the system configuration and the synchronization procedure is the same as that in the first embodiment (see FIGS. 5 and 9).
- the synchronization procedure in the second embodiment will be described by dividing it into four processes (a) to (d), as in the first embodiment.
- (A) System clock ⁇ device clock synchronization process (in wireless device A) This process is a process of reflecting the time of the system clock in the device clock on the side of the wireless device A (wireless device 100A) that is the master device. Since this process is the same as the process (see FIG. 10) in the first embodiment described above, a description thereof will be omitted.
- (B) Synchronization between device clocks (between wireless device A and wireless device B)” This process is a process of synchronizing the device clocks of the wireless device A (wireless device 100A) as the master device and the wireless device B (wireless device 100B) as the slave device.
- FIG. 19 shows a processing flow.
- This processing basically conforms to the FTM protocol in FIG. 2 as in the processing flow shown in FIG. 11 in the first embodiment.
- the formats with the extension fields shown in FIGS. 20 and 21 are adopted as the formats of the FTM request frame and the FTM action frame, which are notification frames.
- the first threshold value (synchronization between device clocks with the counterpart device) used in the synchronization completion determination processing in the synchronization status management processing (in the wireless device A and in the wireless device B)
- the master device determines the accuracy determination condition) and the second threshold value (the determination accuracy condition for synchronization between the device clock in the device and the system clock) and follows the slave device.
- a first threshold value that is a condition for determining the accuracy of synchronization between device clocks is stored in the “Inter-device Syncurity” field, and “Intra-device Sync” In the field of “accuracy”, a second threshold value that is a condition for determining the synchronization accuracy between the device clock and the system clock is stored.
- the master device determines the first threshold value and the second threshold value, and makes them follow the slave device.
- the “RequiredRequireSync Criteria” information of the FTM request frame may be different from the “Required Sync Criteria” information of the FTM action frame.
- the first threshold value and the second threshold value that the slave device requests from the master device may be inserted.
- information for enabling the FTM sequence execution frequency to be optimally adjusted is also notified for the purpose of improving the accuracy of device clock synchronization by FTM.
- This information is stored in the fields of “Traffic Load Information”, “FTM Failure Failure Probability”, and “Ref Clock Drift Rate” in FIGS.
- the “Traffic Load Information” field information on the amount of traffic (reception and transmission) that the local station is exchanging using the wireless interface is placed. Specifically, the amount of transmitted / received information within a certain fixed time is reported. This information is an indicator of wireless load.
- this field is used because the base station cannot grasp the wireless load exchanged with a partner other than the own station.
- FTM Failure Probability information on the probability of FTM frame transmission failure is recorded. If the FTM frame exchange fails, the offset value is not updated. In some cases, drift between reference clocks can accumulate until successful.
- the clock drift between device clocks that is, the amount of frequency deviation, is transmitted. It is possible to grasp how fast the clock shifts from the transition of the past offset calculation results. This information may be used for adjusting the first threshold value.
- the radio control unit 102 of the radio device A and the radio device B performs adjustment using information in each field of “Traffic Load Information”, “FTM Failure Probability”, and “Ref Clock Drift Rate”. For example, as shown in FIG. 19, the slave device increases the FTM request frame transmission interval, the master device increases the number of FTM action frames transmitted per FTM request frame and the transmission interval of FTM action frames, and increases the success rate of the FTM sequence. So that the clock offset can be further reduced.
- (C) Device clock ⁇ System clock synchronization process (in wireless device B) This process is a process of reflecting the time of the device clock in the system clock on the side of the wireless device B (wireless device 100B) that is the slave device. Since this process is the same as the process (see FIG. 14) in the first embodiment described above, a description thereof will be omitted.
- (D) Synchronization status management process (in wireless device A, wireless device B)” This process is performed in parallel with the processes (a) to (c) described above on both the wireless device A (wireless device 100A) side which is the master device and the wireless device B (wireless device 100B) side which is the slave device. This process is performed.
- the parent flow of the synchronization status management process is the same as that in the first embodiment (see FIG. 15). However, the contents of the intra-station synchronization completion determination process and the counterpart station synchronization completion determination process are different from those of the first embodiment.
- FIG. 22 shows a process flow of the intra-station synchronization completion determination process.
- steps corresponding to those in FIG. 16 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.
- the slave device transmits the synchronization determination condition (first threshold value, second threshold value) in step ST13 and step ST14 from the master device in the “Required Sync Criteria” field of the notification frame.
- the determined synchronization determination condition is used. That is, the slave device performs synchronization determination according to the synchronization determination condition determined by the master device.
- step ST13 When it is not determined in step ST13 that the device clock is sufficiently synchronized with the master side, or when it is not determined in step ST14 that the system clock in the local station is sufficiently synchronized with the device clock, the main control unit 101 determines in step ST18. It is determined whether or not the slave device is in a state where the synchronization completion determination condition is not satisfied for a long time.
- step ST19 the synchronization status within the own station is set to “synchronization”. It is updated to “Not done”, and then the process ends in step ST16.
- step ST19 the main control unit 101 updates its own synchronization status to “synchronization reference is strict and synchronization is impossible”. After the process in step ST19, the main control unit 101 ends the process in step ST16.
- the main control unit 101 enters the “Target Clock Sync Status” field of the notification frame in step ST3 of the processing flow of FIG. Write and tell the master device. In this case, it is also possible to write the required value of the synchronization criterion in the “Required Sync Criteria” field of the notification frame and transmit it to the master side.
- FIG. 23 shows the processing flow of the intra-station synchronization completion determination processing.
- steps corresponding to those in FIG. 17 are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.
- step ST26 it is determined whether or not the information in the “Target Clock Sync Status” field received most recently from the connection partner station is “synchronization reference is strict and synchronization is impossible”.
- the main control unit 101 displays a user interface (UI) display for determining whether or not the synchronization reference relaxation with the partner station is possible in step ST27. And prompts the user for input.
- UI user interface
- the user is currently in the “high quality mode” and requests the user to input whether or not to switch to the “standard mode”.
- the “high quality mode” means a mode for synchronization with the original required synchronization accuracy
- the “normal mode” means a mode for synchronization with a more relaxed required synchronization accuracy.
- the main control unit 101 determines in step ST28 whether or not there is an input of “synchronization criteria relaxation acceptance with the counterpart station” from the user, that is, the UI of FIG. It is determined whether or not “YES” is selected in the display example.
- the main control unit 101 changes the requested synchronization accuracy addressed to the connection partner station, that is, the synchronization completion determination criterion desired to be used in step ST29, and Update the contents stored in the “Required Sync Criteria” field.
- the main control unit 101 ends the process in step ST24 after the process of step ST29. Further, when it is determined in step ST26 that the synchronization reference is not strict and synchronization is impossible, or when it is determined in step ST28 that there is no input of synchronization reference relaxation acceptance, the main control unit 101 immediately moves to step ST24 and performs processing. finish.
- a third embodiment will be described.
- the dynamic change of the synchronization determination criterion in the user determination by the user interface described in the second embodiment is used even when the master device does not manage the determination criterion as in the second embodiment. Can do.
- the third embodiment is an example of incorporating a dynamic change of the synchronization determination criterion in the user judgment by the user interface based on the above-described first embodiment.
- the correspondence between the system configuration and the synchronization procedure is the same as that in the first embodiment (see FIGS. 5 and 9).
- the synchronization procedure in the third embodiment will be described by dividing it into four processes (a) to (d) as in the first embodiment.
- (A) System clock ⁇ device clock synchronization process (in wireless device A) This process is a process of reflecting the time of the system clock in the device clock on the side of the wireless device A (wireless device 100A) that is the master device. Since this process is the same as the process (see FIG. 10) in the first embodiment described above, a description thereof will be omitted.
- (B) Synchronization between device clocks (between wireless device A and wireless device B)” This process is a process of synchronizing the device clocks of the wireless device A (wireless device 100A) as the master device and the wireless device B (wireless device 100B) as the slave device. Since this process is also the same as the process (see FIG. 10) in the first embodiment described above, the description thereof is omitted.
- the format of a frame to be transmitted / received also conforms to the first embodiment.
- (C) Device clock ⁇ System clock synchronization process (in wireless device B) This process is a process of reflecting the time of the device clock in the system clock on the side of the wireless device B (wireless device 100B) that is the slave device. Since this process is the same as the process (see FIG. 14) in the first embodiment described above, a description thereof will be omitted.
- the first threshold (judgment condition for the synchronization accuracy between device clocks with the counterpart device) and the second threshold (between the device clock and the system clock in the device) used in the synchronization completion determination process This is a precondition for setting and managing the synchronization accuracy determination conditions) at the responsibility of each device.
- the parent flow of the synchronization status management process is the same as that in the first embodiment (see FIG. 15). However, the content of the intra-station synchronization completion determination process, which is the internal process, is different from that of the first embodiment.
- FIG. 26 shows a processing flow of the intra-station synchronization completion determination processing in the third embodiment.
- steps corresponding to those in FIG. 16 are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.
- step ST30 the main control unit 101 determines whether or not a situation that cannot be regarded as synchronized in the determination of the first threshold value or the determination of the second threshold value continues for a long time.
- step ST31 the main control unit 101 displays a user interface (UI) on the display unit 103 for determining whether the synchronization completion determination criteria used by the own station can be relaxed, Require user input.
- UI user interface
- An example of UI display is the same as in the second embodiment (see FIG. 24).
- step ST32 the main control unit 101 determines whether or not there is an input of “synchronization reference relaxation acceptance” from the user, that is, whether or not “YES” is selected in the UI display example of FIG. .
- the main control unit 101 changes the synchronization completion determination reference used by the own station in step ST33, and uses “Used ⁇ Sync” of the notification frame used for transmission after the next time. Update the content stored in the Criteria field.
- the main control unit 101 ends the process in step ST16 after the process of step ST33. Further, when it is determined in step ST30 that it has not continued for a long time, or when it is determined in step ST32 that there is no input of acceptance of synchronization reference relaxation, the main control unit 101 immediately moves to step ST16 and ends the process.
- the reference can be adjusted after obtaining the user's permission.
- Table 1 below schematically shows the outline and differences of the first embodiment, the second embodiment, and the third embodiment.
- FIG. 25 shows an example in which information of “clockrangranularityatioratio” and “clock difference” is placed on the vendor-specific element of the FTM action frame in the second embodiment.
- the information “clock granularity ratio” indicates the ratio of the granularity between the system clock and the device clock.
- the information of “clock ⁇ difference” indicates a difference value to be added after the ratio of the granularity of the system clock and the device clock is aligned with the system clock. Note that the added two pieces of information may be included as another second vendor-specific element.
- the synchronization protocol in the wireless layer is the FTM (Fine Timing Measurement) protocol.
- the synchronization protocol in the wireless layer is not limited to the FTM protocol, and may be a TM (Timing Measurement) protocol.
- the same processing can be performed by simply replacing the FTM action frame with the TM action frame in the device clock synchronization process of FIG. 11 described above.
- the present technology can be similarly applied only by changing a notification frame in which information in the vendor-specific element in the present technology is placed.
- the notification frame is an FTM request frame or an FTM action frame.
- the notification frame is not limited to these, and may be another management frame or a public action frame.
- the present technology can be applied regardless of the type of frame as long as equivalent information can be transmitted.
- the synchronization target clock to be synchronized between the two wireless devices via the device clock is the system clock, but the time of the media processing unit such as audio and video is managed. Another clock such as a clock to be used may be used.
- the synchronization procedure is the same as that in the above-described embodiment only by replacing the system clock of the main control unit 101 with the clock of the media processing unit.
- the system clock of the wireless device 100A which is the master device, is used as the master clock for all the systems.
- the device clock of the wireless device 100A is used as the master clock.
- the wireless device 100A may perform the process (c) instead of the process (a) of the synchronization procedure described above.
- the format of the 802.1AS-compliant extended FTM action frame and the extended field of the present technology may be used together. In that case, each vendor-specific element is arranged in order.
- this technique can also take the following structures.
- a main control unit whose time is managed by a first clock;
- a wireless control unit whose time is managed by a second clock;
- a wireless device that includes a clock synchronization management unit that manages a state of clock synchronization, and that the wireless control unit notifies other wirelessly connected wireless devices of information regarding the state of clock synchronization by transmitting a frame.
- the wireless device according to (1) wherein the information regarding the status of the clock synchronization includes information indicating a synchronization status.
- the synchronization status has three statuses: synchronized and not synchronized, or synchronized, unsynchronized, and synchronization criteria are severely unsynchronized. ) Wireless device.
- the clock synchronization management unit determines that the clock is synchronized when the absolute value of the clock difference between the first clock and the second clock within a predetermined time is equal to or smaller than a second threshold.
- the wireless device according to (3) The clock synchronization management unit is configured such that an absolute value of a clock difference between the first clock and the second clock within a predetermined time is equal to or less than a second threshold value and the second clock within the predetermined time.
- the wireless device according to (3) wherein when the absolute value of the offset with the other wireless device is equal to or less than a first threshold value, the synchronization is determined.
- the information regarding the status of the clock synchronization further includes information on clock drift between the second clock and the other wireless device.
- the wireless control unit transmits the association information of the first clock and the second clock to the other wireless device by transmitting the frame,
- the wireless device according to (11), wherein the association information further includes granularity ratio information of the two clocks.
- the wireless control unit The information on the status of the clock synchronization is transmitted as a part of a frame for measuring the time of the wireless control unit with the other wireless device.
- the wireless device according to any one of (1) to (13), further including a display unit configured to display a user interface based on information regarding the clock synchronization status.
- the clock synchronization management unit requests the user to determine whether or not the synchronization completion criterion used in the own station may be relaxed when the state of non-synchronization continues for a predetermined time.
- the wireless device according to (14), wherein a user interface is displayed and the synchronization reference is changed when the user permits relaxation.
- a main control unit whose time is managed by the first clock;
- a wireless control unit whose time is managed by a second clock;
- a processing method of a wireless device including a clock synchronization management unit that manages the status of clock synchronization,
- a method of processing a wireless device comprising: a step in which the wireless control unit notifies other wireless devices wirelessly connected of information related to the state of clock synchronization by transmitting a frame.
- a main control unit whose time is managed by the first clock; A wireless control unit for managing time by a second clock; The wireless control unit detects information about the clock synchronization status from other wirelessly connected wireless devices by receiving a frame, A wireless device further comprising: a display unit configured to display a user interface based on information regarding the clock synchronization status.
- the information related to the clock synchronization status includes information indicating a synchronization status.
- the wireless control unit frames the relaxation of the synchronization reference on the other wireless device.
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Abstract
Description
IEEE1588 PTP(Precision Time Protocol)に準拠したフォーマットのフレーム、即ちSYNCフレームやFOLLOW_UPフレーム、PDELAY_Reqフレーム、PDELAY_Respフレームを使用して、無線メディアを通してそのフレーム交換を行い、システムクロックを同期する(非特許文献1参照)。上位層でタイムスタンプを付与することを想定したフォーマットになるため、同期精度が悪くなる欠点がある。
802.11-2016規格にて規定されているFTM(Fine Timing Measurement)プロトコルを使用し、まず機器間のデバイスクロックのずれを求めて同期させる(非特許文献2参照)。その後、デバイスクロックの時刻値をシステムクロックに反映させる。
第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部と、
クロック同期の状況を管理するクロック同期管理部を備え
上記無線制御部は、無線接続された他の無線機器に、クロック同期の状況に関する情報をフレームの送信により通知する
無線機器にある。
第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部を備え、
上記無線制御部は、無線接続された他の無線機器から、クロック同期の状況に関する情報をフレームの受信により検知し、
上記クロック同期の状況に関する情報に基づいたユーザインタフェース表示をする表示部をさらに備える
無線機器にある。
1.実施の形態
第1の実施の形態
第2の実施の形態
2.変形例
「参照規格の説明」
参照する規格を説明する。機器間で高精度な時刻同期を行う補正手法として、IEEE1588規格「1588-2008 - IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems」が規定されている。この規格のプロトコルはPTP(Precision Time Protocol)とも呼ばれる。
第1の実施の形態について説明する。図5は、実施の形態としての無線システム10の構成例を示している。この無線システム10は、無線機器100Aと無線機器100Bを有する構成となっている。この実施の形態では、無線機器100Aがクロックマスター(Clock Master)の無線機器Aであり、無線機器100Bがクロックスレーブ(Clock Slave)の無線機器Bであるとする。
この処理は、マスター機器である無線機器A(無線機器100A)側において、システムクロックの時刻をデバイスクロックに反映させる処理である。図10は、処理フローを示している。
(2)次に、メイン制御部101は、システムクロックのカウントを読み出す。
(3)次に、メイン制御部101は、デバイスクロックとシステムクロックの粒度、すなわち単位を揃えた上で、クロック差分を算出する。
この処理は、マスター機器である無線機器A(無線機器100A)とスレーブ機器である無線機器B(無線機器100B)のデバイスクロックを同期させる処理である。図11は、処理フローを示している。
この処理は、スレーブ機器である無線機器B(無線機器100B)側において、デバイスクロックの時刻をシステムクロックに反映させる処理である。図14は、処理フローを示している。基本的に、上述の「(a)システムクロック→デバイスクロックの同期処理」とは逆方向の同等の操作を行うことになる。
(2)次に、メイン制御部101は、無線制御部102側のデバイスクロックのカウントを読み出す。
(3)次に、メイン制御部101は、デバイスクロックとシステムクロックのクロック差分を算出する。
この処理は、マスター機器である無線機器A(無線機器100A)側と、スレーブ機器である無線機器B(無線機器100B)側の双方で、上述した(a)~(c)の処理と並行して行われる処理である。この実施の形態において、同期状況管理処理は、メイン制御部101で行われるものとする。
第2の実施の形態について説明する。第2の実施の形態は、上述の第1の実施の形態よりも供給する情報を増やして、より細かい制御を可能にする例である。システム構成、同期手順との対応関係は、第1の実施の形態と同様である(図5、図9参照)。第2の実施の形態における同期手順を、上述の第1の実施の形態と同様に、(a)~(d)の4つの処理に分けて説明する。
この処理は、マスター機器である無線機器A(無線機器100A)側において、システムクロックの時刻をデバイスクロックに反映させる処理である。この処理は、上述の第1の実施の形態における処理(図10参照)と同様であるので、説明は省略する。
この処理は、マスター機器である無線機器A(無線機器100A)とスレーブ機器である無線機器B(無線機器100B)のデバイスクロックを同期させる処理である。図19は、処理フローを示す。
この処理は、スレーブ機器である無線機器B(無線機器100B)側において、デバイスクロックの時刻をシステムクロックに反映させる処理である。この処理は、上述の第1の実施の形態における処理(図14参照)と同様であるので、説明は省略する。
この処理は、マスター機器である無線機器A(無線機器100A)側と、スレーブ機器である無線機器B(無線機器100B)側の双方で、上述した(a)~(c)の処理と並行して行われる処理である。この同期状況管理処理の親フローは、第1の実施の形態と共通である(図15参照)。しかし、自局内同期完了判定処理と、相手局内同期完了判定処理の内容は、第1の実施の形態とは異なる。
第3の実施の形態について説明する。上述の第2の実施の形態で説明したユーザインタフェースによるユーザ判断での同期判定基準の動的変更は、第2の実施形態のようにマスター機器が判定基準を管理する場合でなくとも利用することができる。
この処理は、マスター機器である無線機器A(無線機器100A)側において、システムクロックの時刻をデバイスクロックに反映させる処理である。この処理は、上述の第1の実施の形態における処理(図10参照)と同様であるので、説明は省略する。
この処理は、マスター機器である無線機器A(無線機器100A)とスレーブ機器である無線機器B(無線機器100B)のデバイスクロックを同期させる処理である。この処理も、上述の第1の実施の形態における処理(図10参照)と同様であるので、説明は省略する。送受信するフレームのフォーマットに関しても第1の実施の形態に準拠する。
この処理は、スレーブ機器である無線機器B(無線機器100B)側において、デバイスクロックの時刻をシステムクロックに反映させる処理である。この処理は、上述の第1の実施の形態における処理(図14参照)と同様であるので、説明は省略する。
この処理は、マスター機器である無線機器A(無線機器100A)側と、スレーブ機器である無線機器B(無線機器100B)側の双方で、上述した(a)~(c)の処理と並行して行われる処理である。
なお、上述実施の形態においては、通知用フレームに対して判定閾値やFTMシーケンスの調整に必要な情報を載せる例を示した。デバイスクロック(参照クロック)とシステムクロック(同期対象クロック)の間で、表現できる桁の幅やカウントの粒度、すなわち単位の違いがある場合、その差分を埋めるための情報を、通知用フレームに対してさらに追加してもよい。
(1)第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部と、
クロック同期の状況を管理するクロック同期管理部を備え
上記無線制御部は、無線接続された他の無線機器に、クロック同期の状況に関する情報をフレームの送信により通知する
無線機器。
(2)上記クロック同期の状況に関する情報は、同期ステータスを示す情報を含む
前記(1)に記載の無線機器。
(3)上記同期ステータスは、同期しているおよび同期していない、という2つのステータス、あるいは同期している、同期していないおよび同期基準が厳しく同期不能、という3つのステータスを持つ
前記(2)に記載の無線機器。
(4)上記クロック同期管理部は、所定時間内の上記第1のクロックと上記第2のクロックのクロック差分の絶対値が第2の閾値以下であるとき、上記同期している、と判定する
前記(3)に記載の無線機器。
(5)上記クロック同期管理部は、所定時間内の上記第1のクロックと上記第2のクロックのクロック差分の絶対値が第2の閾値以下であり、かつ所定時間内の上記第2のクロックの上記他の無線機器との間のオフセットの絶対値が第1の閾値以下であるとき、上記同期している、と判定する
前記(3)に記載の無線機器。
(6)上記クロック同期管理部は、同期していない状態が所定時間続いているとき、上記同期基準が厳しく同期不能、と判定する
前記(3)に記載の無線機器。
(7)上記クロック同期の状況に関する情報は、上記同期ステータスの判定のための基準をさらに含む
前記(2)から(6)のいずれかに記載の無線機器。
(8)上記クロック同期の状況に関する情報は、上記フレームの送信失敗率の情報をさらに含む
前記(2)から(7)のいずれかに記載の無線機器。
(9)上記クロック同期の状況に関する情報は、無線のトラフィック量の情報をさらに含む
前記(2)から(8)のいずれかに記載の無線機器。
(10)上記クロック同期の状況に関する情報は、上記第2のクロックの上記他の無線機器との間のクロックドリフトの情報をさらに含む
前記(2)から(9)のいずれかに記載の無線機器。
(11)上記無線制御部は、上記他の無線機器に、上記フレームの送信により、上記第1のクロックと上記第2のクロックの対応付け情報を送信し、
上記対応付け情報には、上記2つのクロックの差分情報が含まれる
前記(1)から(10)のいずれかに記載の無線機器。
(12)上記対応付け情報には、上記2つのクロックの粒度比情報がさらに含まれる
前記(11)に記載の無線機器。
(13)上記無線制御部は、
上記クロック同期の状況に関する情報を、上記無線制御部の時刻を上記他の無線機器との間で計測するためのフレームの一部として送信する
前記(1)から(12)のいずれかに記載の無線機器。
(14)上記クロック同期の状況に関する情報に基づいたユーザインタフェース表示をする表示部をさらに備える
前記(1)から(13)のいずれかに記載の無線機器。
(15)上記クロック同期管理部は、同期していない状態が所定時間続いているとき、上記表示部に、自局内が使用する同期完了判定基準を緩和してよいかの判断をユーザに要求するユーザインタフェース表示をし、上記ユーザが緩和することを許諾したとき、上記同期基準を変更する
前記(14)に記載の無線機器。
(16)第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部と、
クロック同期の状況を管理するクロック同期管理部を備える無線機器の処理方法であって、
上記無線制御部が、無線接続された他の無線機器に、クロック同期の状況に関する情報をフレームの送信により通知するステップを有する
無線機器の処理方法。
(17)第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部を備え、
上記無線制御部は、無線接続された他の無線機器から、クロック同期の状況に関する情報をフレームの受信により検知し、
上記クロック同期の状況に関する情報に基づいたユーザインタフェース表示をする表示部をさらに備える
無線機器。
(18)上記クロック同期の状況に関する情報は、同期ステータスを示す情報を含む
前記(17)に記載の無線機器。
(19)上記同期ステータスが、上記同期基準が厳しく同期不能、を意味するステータスを示しているとき、上記表示部は、上記他の無線機器との同期基準を緩和してよいかの判断をユーザに要求するユーザインタフェース表示をし、上記ユーザが上記他の無線機器との同期基準を緩和することを許諾したとき、上記無線制御部は、上記他の無線機器に、上記同期基準の緩和をフレームの送信により伝える
請求項18に記載の無線機器。
(20)上記第1のクロックに基づいた処理を行うアプリケーション部をさらに備える
前記(17)から(19)のいずれかに記載の無線機器。
100A,100B・・・無線機器
101・・・メイン制御部
102・・・無線制御部
103・・・表示部
Claims (20)
- 第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部と、
クロック同期の状況を管理するクロック同期管理部を備え
上記無線制御部は、無線接続された他の無線機器に、クロック同期の状況に関する情報をフレームの送信により通知する
無線機器。 - 上記クロック同期の状況に関する情報は、同期ステータスを示す情報を含む
請求項1に記載の無線機器。 - 上記同期ステータスは、同期しているおよび同期していない、という2つのステータス、あるいは同期している、同期していないおよび同期基準が厳しく同期不能、という3つのステータスを持つ
請求項2に記載の無線機器。 - 上記クロック同期管理部は、所定時間内の上記第1のクロックと上記第2のクロックのクロック差分の絶対値が第2の閾値以下であるとき、上記同期している、と判定する
請求項3に記載の無線機器。 - 上記クロック同期管理部は、所定時間内の上記第1のクロックと上記第2のクロックのクロック差分の絶対値が第2の閾値以下であり、かつ所定時間内の上記第2のクロックの上記他の無線機器との間のオフセットの絶対値が第1の閾値以下であるとき、上記同期している、と判定する
請求項3に記載の無線機器。 - 上記クロック同期管理部は、同期していない状態が所定時間続いているとき、上記同期基準が厳しく同期不能、と判定する
請求項3に記載の無線機器。 - 上記クロック同期の状況に関する情報は、上記同期ステータスの判定のための基準をさらに含む
請求項2に記載の無線機器。 - 上記クロック同期の状況に関する情報は、上記フレームの送信失敗率の情報をさらに含む
請求項2に記載の無線機器。 - 上記クロック同期の状況に関する情報は、無線のトラフィック量の情報をさらに含む
請求項2に記載の無線機器。 - 上記クロック同期の状況に関する情報は、上記第2のクロックの上記他の無線機器との間のクロックドリフトの情報をさらに含む
請求項2に記載の無線機器。 - 上記無線制御部は、上記他の無線機器に、上記フレームの送信により、上記第1のクロックと上記第2のクロックの対応付け情報を送信し、
上記対応付け情報には、上記2つのクロックの差分情報が含まれる
請求項1に記載の無線機器。 - 上記対応付け情報には、上記2つのクロックの粒度比情報がさらに含まれる
請求項11に記載の無線機器。 - 上記無線制御部は、
上記クロック同期の状況に関する情報を、上記無線制御部の時刻を上記他の無線機器との間で計測するためのフレームの一部として送信する
請求項1に記載の無線機器。 - 上記クロック同期の状況に関する情報に基づいたユーザインタフェース表示をする表示部をさらに備える
請求項1に記載の無線機器。 - 上記クロック同期管理部は、同期していない状態が所定時間続いているとき、上記表示部に、自局内が使用する同期完了判定基準を緩和してよいかの判断をユーザに要求するユーザインタフェース表示をし、上記ユーザが緩和することを許諾したとき、上記同期基準を変更する
請求項14に記載の無線機器。 - 第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部と、
クロック同期の状況を管理するクロック同期管理部を備える無線機器の処理方法であって、
上記無線制御部が、無線接続された他の無線機器に、クロック同期の状況に関する情報をフレームの送信により通知するステップを有する
無線機器の処理方法。 - 第1のクロックで時刻が管理されるメイン制御部と、
第2のクロックで時刻が管理される無線制御部を備え、
上記無線制御部は、無線接続された他の無線機器から、クロック同期の状況に関する情報をフレームの受信により検知し、
上記クロック同期の状況に関する情報に基づいたユーザインタフェース表示をする表示部をさらに備える
無線機器。 - 上記クロック同期の状況に関する情報は、同期ステータスを示す情報を含む
請求項17に記載の無線機器。 - 上記同期ステータスが、上記同期基準が厳しく同期不能、を意味するステータスを示しているとき、上記表示部は、上記他の無線機器との同期基準を緩和してよいかの判断をユーザに要求するユーザインタフェース表示をし、上記ユーザが上記他の無線機器との同期基準を緩和することを許諾したとき、上記無線制御部は、上記他の無線機器に、上記同期基準の緩和をフレームの送信により伝える
請求項18に記載の無線機器。 - 上記第1のクロックに基づいた処理を行うアプリケーション部をさらに備える
請求項17に記載の無線機器。
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US20200127751A1 (en) | 2020-04-23 |
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