WO2008059558A1

WO2008059558A1 - Wireless communication system

Info

Publication number: WO2008059558A1
Application number: PCT/JP2006/322581
Authority: WO
Inventors: Daisuke Watanabe; Yoshikazu Motomura
Original assignee: Fujitsu Limited
Priority date: 2006-11-13
Filing date: 2006-11-13
Publication date: 2008-05-22

Abstract

When a wireless control apparatus (C101) and wireless communication apparatuses (C201,C202) use a time division multiplex communication to communicate with each other, the wireless control apparatus (C101) allocates wireless channel intervals to the wireless communication apparatuses (C201,C202). At this moment, when allocating a wireless channel interval to the wireless communication apparatus (C201), the wireless control apparatus (C101) also allocates thereto a priority to use this wireless channel interval. Similarly, when allocating a wireless channel interval to the wireless communication apparatus (C202), the wireless control apparatus (C101) also allocates thereto a priority to use this wireless channel interval. Each wireless channel interval is used by the wireless communication apparatus to which the greatest priority has been allocated. When the wireless communication apparatus, to which the greatest priority has been allocated, becomes unable to perform communication, another wireless communication apparatus, which monitors the communication status of that wireless communication apparatus and has the second greatest priority, uses the wireless channel interval to perform communication.

Description

Wireless communication system

Technical field

[0001] The present invention relates to a radio communication system using a time division multiplexing communication method.

Background art

[0002] Various wireless communication systems have been proposed due to the significant development of wireless communication technology in recent years, and their standardization and practical use are being promoted. In particular, many wireless communication systems such as IEEE802.11, WiMedia, and wireless USB that use time-division multiplexing for wireless communication have been standardized and put to practical use. It is assumed that it will be put into practical use.

[0003] A wireless communication system using a time division multiplexing method as a wireless communication method assigns each period of a wireless channel divided into time units to each wireless device with a certain wireless device power. The wireless device performs communication in each assigned period. At this time, each period is assigned only one to one wireless device.

[0004] An example of a wireless communication system that uses time division multiplexing as a wireless communication method is wireless USB, which is a standard for high-speed short-distance wireless communication, and this wireless USB is only on the network. There is only one radio control device called a host. For a radio communication device called one or more devices on the network, the period of the radio channel divided into time units called MAS (Media Access Slot) is set. By assigning, wireless communication is performed between the host and the device during each assigned period.

[0005] However, in a wireless communication system using such a time division multiplexing communication method, a wireless device to which a wireless channel period is assigned is assigned due to congestion in the wireless device or deterioration of a transmission path state. If it is not possible to communicate normally during the specified period, there is a possibility that two events will occur. At this time, the period assigned to the wireless device that cannot communicate normally is wasted.

[0006] Patent Documents 1 to 3 are known as prior arts that disclose the technology of knock ground. Special Permissible Document 1 discloses a dynamic automatic channel allocation technique. Patent Document 2 discloses a technique in which communication is performed using a plurality of communication slots in time division multiplex communication, and communication is performed using another slot when a failure occurs in the slot. Patent Document 3 discloses a technique for improving the probability of establishing a call by transferring a signal to another transfer destination even when communication with the transfer destination is not established.

Patent Document 1: Japanese Patent Laid-Open No. 10-79977

Patent Document 2: Japanese Patent Laid-Open No. 11-46174

Patent Document 3: Japanese Patent Laid-Open No. 09-200304

Disclosure of the invention

[0007] An object of the present invention is that in a wireless communication system using a time division multiplexing communication method, a wireless communication apparatus to which a radio channel period is allocated is normally transmitted in the allocated period. An object of the present invention is to provide a radio communication system capable of reducing the wasteful use of the period of the radio channel that occurs when communication cannot be performed and improving the use efficiency of the radio channel.

[0008] The radio communication system of the present invention is provided in the radio control apparatus in the radio communication system including the radio control apparatus and one or more radio communication apparatuses that communicate using the time division multiplex communication system. An allocation notification means for allocating the radio channel period to the one or more radio communication apparatuses with different priorities, and notifying the allocation information to the one or more radio communication apparatuses, and the one or more radio communication apparatuses. Each of the communication devices is provided with a monitoring means for monitoring a communication state of a wireless communication device that has a higher priority than the own wireless communication device for a certain wireless channel period, and each of the one or more wireless communication devices. The wireless communication device is communicated with the wireless control device using a wireless channel period in which the wireless communication device is given the highest priority, and the wireless communication device has a higher priority than the wireless communication device at that time. And a communication means for performing communication using a radio channel period assigned to the wireless communication device that has become unable to communicate when the wireless communication device becomes unable to communicate. And

Brief Description of Drawings

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a hardware configuration example of a host and a device according to the present embodiment.

FIG. 3 is a diagram showing a communication sequence example of the first radio control device, the first radio communication device, and the second radio communication device according to the embodiment of the present invention.

FIG. 4 is a flowchart showing an example of radio channel assignment processing of the radio network controller according to the embodiment of the present invention.

FIG. 5 is a diagram showing a configuration example of data holding radio channel allocation information of the radio network controller according to the embodiment of the present invention.

FIG. 6 is a diagram showing a configuration example of data holding radio channel allocation information of the radio network controller according to the embodiment of the present invention.

FIG. 7 is a flowchart showing an example of communication processing of the wireless communication device according to the embodiment of the present invention.

[Figure 8] Wireless USB Channel Time Allocation IE data structure format.

[Figure 9] Wireless USB W CTA data structure format.

DR

[Figure 10] Wireless USB W CTA data structure format.

DT

[Fig. 11] Wireless USB Device Capabilities data structure format.

BEST MODE FOR CARRYING OUT THE INVENTION

[0010] The radio network controller of the present invention includes an assigning unit that assigns one period of a radio channel to one or more radio communication apparatuses with different priorities.

In the wireless communication device of the present invention, when one period of the wireless channel is assigned to one or more wireless communication devices including the own wireless communication device! / Confirmation means for confirming the communication status of another wireless communication device assigned a higher priority than the communication device, and a higher priority assigned to the wireless communication device than the own wireless communication device during the period, and normal communication is possible If there is no other wireless communication device, communication means for starting communication is provided.

[0011] In the present invention, the radio network controller performs one or more radio communications in one period of the radio channel. Assign different priorities to devices. The wireless communication apparatus given the highest priority in a certain period of the wireless channel starts communication at the start of the period of the wireless channel. The wireless communication device is given the highest priority in the period of the wireless channel !, and the wireless communication device is given the highest priority at the start of the period of the wireless channel! Start monitoring the communication status of the communication device. In the period of the radio channel, the highest priority is given and normal communication of the radio communication device is not performed! /, In the case, the highest priority is given! / Next to the communication device, the wireless communication device with the highest priority and priority starts communication. After that, if the wireless communication device with higher priority than the own wireless communication device cannot perform normal communication, and the wireless communication device that starts communication cannot perform normal communication, A high-priority wireless communication device starts communication.

[0012] In this way, even when the wireless communication apparatus power assigned with the period of the wireless channel cannot perform normal communication during the period of the wireless channel, the other wireless communication apparatus communicates to perform wireless communication. It is possible to reduce unnecessary waste of the channel period.

[0013] FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present invention. In FIG. 1, a wireless communication device C201 and a wireless communication device C202 perform wireless communication with a wireless control device C101 via a wireless channel.

[0014] For example, the wireless control device C101 is a wireless USB host such as a personal computer, and the wireless communication devices C201 and C202 are wireless USB devices such as a digital camera or a hard disk drive device. Wireless communication is performed via this.

FIG. 2 is a block diagram showing a hardware configuration example of the wireless control device C101 and the wireless communication devices C201 and C202 according to the present embodiment.

A node 901, a central processing unit (CPU) 902, a ROM 903, a RAM 904, a wireless communication device 05, an input device 906, an output device 907, and an external storage device 908 are connected. The CPU 902 processes and calculates data and controls each component connected via the node 901. The ROM 903 stores a control procedure (computer program) of the CPU 902 in advance, and the CPU 902 executes this computer program. Thus, the processing shown in FIGS. 4 and 7 described later is performed. In addition, a computer program may be stored in the external storage device 908, the computer program may be copied to the RAM 904 and executed by the CPU 902, and the processing of FIGS. 4 and 7 may be performed. The RAM 904 is used as a work memory for data input / output, transmission / reception, and temporary storage for control of each component. The external storage device 908 is, for example, a hard disk storage device or a memory force, and the stored content does not disappear even when the power is turned off. The wireless communication unit 905 can perform wireless communication such as wireless USB. The input device 906 is, for example, a keyboard or a button, and can perform various designations or inputs. The output device 907 is a display or the like.

FIG. 3 is a diagram showing an example of a communication sequence of the first radio control apparatus C101, the first radio communication apparatus C201, and the second radio communication apparatus C202 according to the embodiment of the present invention.

In FIG. 3, the first radio network controller C101 has a period from time T1 to time T2 with high priority for the first radio communication device C201 and low priority for the second radio communication device C202. Allocation, and the period from time T2 to time T3 is assigned to the second radio communication device C202 with high priority and to the first radio communication device C201 with low priority. Then, the control signal including the allocation information of the period from the time T1 to the time T3 generated in the above process is sent through the radio channel to the first radio communication device C201 and the second radio communication device C202. Wirelessly transmitted to all wireless communication devices existing in the wireless range of the first wireless control device C 101 including

[0017] In the period from time T1 to time T2, the first radio communication in which the period from time T1 to time T2 is assigned with high priority by the control signal transmitted by radio from the first radio control apparatus C101. Device C201 communicates. In addition, the second wireless communication device C202 assigned with a low priority period from time T1 to time T2 by the control signal wirelessly transmitted by the first wireless control device C101 is transmitted from time T1 to time T2. The communication status of the first wireless communication device C201 assigned with a higher priority is monitored. At this time, if the second wireless communication device C202 detects normal communication of the first wireless communication device C201 assigned with a higher priority in the period from time T1 to time T2, the time T1 power also reaches time T2. Monitoring of the communication status of the first wireless communication device C201 during End.

[0018] In the period from time T2 to time T3, the second radio assigned the period from time Τ2 to time Τ3 with high priority by the control signal transmitted wirelessly by the first radio control apparatus C101. Communication device C202 may not be able to communicate. Therefore, the first wireless communication device C201 assigned with a low priority in the period from time Τ2 to time によって 3 by the control signal wirelessly transmitted by the first wireless control device C101 is the period from time Τ2 to time Τ3. The communication status of the second wireless communication apparatus C202 assigned with higher priority is monitored. At this time, when the first wireless communication device C201 detects that the second wireless communication device C202, which is assigned with a high priority during the period from time Τ2 to time Τ3, detects that communication cannot be performed from time Τ2 to time Τ3. The monitoring of the communication status of the second wireless communication device C202 in the period is ended, and communication with the wireless control device C101 is started.

[0019] In the above sequence, as a method for a certain wireless communication device to monitor the communication status of another wireless communication device, other wireless communication device and the wireless control device communicate with each other! There is a method of receiving radio waves leaking to the wireless communication device, analyzing it by its own device, and monitoring whether or not other wireless communication devices can communicate normally. Alternatively, since the wireless control device knows the state of the wireless communication device within its own wireless range, there is a method in which the wireless control device notifies the communication status of another wireless communication device.

FIG. 4 is a flowchart showing an example of radio channel allocation processing of the radio network controller according to the embodiment of the present invention.

In FIG. 4, the radio network controller stores a radio channel time list in which radio channel times that can be assigned to each radio communication device are stored, and identification information of radio communication devices that request radio channel time allocation. It is assumed that the list of registered wireless communication devices is maintained.

First, in step S501, it is confirmed whether there is a radio channel time that can be assigned to each radio communication device in the radio channel time list. If there is a radio channel time that can be assigned in the radio channel time list, the process proceeds to step S502. If there is no radio channel time that can be assigned to the radio channel time list, the process proceeds to step S507. [0022] In step S502, the radio channel time for starting allocation to each radio communication device is extracted from the radio channel time list, and the process proceeds to step S503. At this time, for example, the radio channel time closest to the current time is extracted from the radio channel time list.

[0023] In step S503, it is confirmed whether or not there is a wireless communication device that requests assignment of a wireless channel time in the wireless communication device list. If there is a wireless communication device that requests assignment of a wireless channel time in the wireless communication device list, the process proceeds to step S504. If there is no wireless communication device requesting radio channel time allocation in the wireless communication device list, the process proceeds to step S507.

In step S504, the wireless communication device to which the wireless channel time extracted in step S502 is assigned is extracted from the wireless communication device list, and the process proceeds to step S505. At this time, for example, as described below, the wireless communication device is extracted from the wireless communication device list.

1. Extract in order of the wireless communication device that requested the allocation of the wireless channel first.

2. In the wireless channel time extracted in step S502, the largest communication volume (time) is extracted in order from the wireless communication device among wireless communication devices that can complete communication within the available time.

[0025] At this time, for example, the available time in the radio channel time in the above processing is the amount of communication already allocated from the radio channel time extracted in step S502 for the radio communication device to which radio channel time is to be allocated. And the power of the wireless communication device that has become unable to communicate is the time obtained by subtracting the time required for switching to the wireless communication device.

3. The order of extracting wireless communication devices is determined according to the type of data to be communicated. At this time, for example, data that requires immediacy, such as audio, video, and text, is extracted with priority.

[0026] It is assumed that the priority of the radio communication device assigned to each radio channel time is higher in the extraction order from the radio communication device list and higher in the lower order. Therefore, the wireless communication device having the highest priority is the device first extracted from the wireless communication device list.

In step S505, the radio channel time extracted in step S502 is used as the step S504. The wireless communication apparatus extracted in step S506 is assigned with a priority different from that assigned to the wireless communication apparatus that has already been assigned the wireless channel time extracted in step S502, and the process proceeds to step S506. At this time, for example, the radio channel time allocation information can be held in a table as shown in FIG. In the example of FIG. 5, a list of wireless communication devices is maintained for each wireless channel time. In step S505, each time a radio communication device is assigned to the radio channel time, the radio communication device is added to the list of radio communication devices in the radio channel time. In the table of FIG. 5, the priority at each radio channel time is indicated by the order of the radio communication device list at each radio channel time. Also, the radio channel time allocation information can be held by a table as shown in FIG. In the example of FIG. 6, for each radio channel time, a list having a unit of a wireless communication device to which a wireless channel time is assigned and a priority set assigned to the wireless communication device is maintained. In step S505, each time a radio communication device is assigned to the radio channel time, a set of the radio communication device and priority is added to the list of radio channel times.

In step S506, the number of radio communication devices to which the radio channel time extracted in step S502 is allocated exceeds the number of radio communication devices that can be allocated in the radio channel time extracted in step S502. To check. Number of radio communication devices assigned with the radio channel time extracted in step S502 If the number of radio communication devices that can be assigned is not exceeded in the radio channel time extracted in step S502, step Proceeding to S503, the wireless channel time extracted in step S502 is assigned to a wireless communication device different from the wireless communication device extracted in the previous step S504. If the number of radio communication devices to which the radio channel time extracted in step S502 is assigned exceeds the number of radio communication devices that can be assigned in the radio channel time extracted in step S502, Proceeding to step S501, radio communication apparatus allocation processing is performed for a radio channel time different from the radio channel time extracted in the previous step S502. At this time, as described below, for example, the number of radio communication apparatuses that can be allocated to the radio channel time is determined.

1. From the wireless channel time, the communication volume and communication required for the already assigned wireless communication device If there is no wireless communication device that can complete communication within the time obtained by subtracting the time required for switching to the wireless communication device that performs the communication, the number of wireless communication devices set up to that point is The number of wireless communication devices that can be allocated to time.

[0029] In step S507, it is confirmed whether or not there is information on the radio channel time to which the radio communication device is allocated. If there is information on the radio channel time to which the radio communication device is allocated, the process proceeds to step S508. If there is no information on the radio channel time to which the radio communication device is allocated, the process ends without doing anything.

[0030] In step S508, the wireless channel time information assigned to the wireless communication device generated in steps S501 to S506 is wirelessly transmitted to all wireless communication devices existing in the wireless range of the wireless control device. Send and finish the process.

[0031] FIG. 7 is a flowchart showing an example of communication processing of the wireless communication apparatus according to the embodiment of the present invention.

In FIG. 7, first, in step S601, radio channel time allocation information wirelessly transmitted to all radio communication devices existing in the radio range of the radio control device is received from the radio control device. move on.

[0032] In step S602, it is confirmed whether the radio channel time allocated to the own radio communication device is included in the radio channel time allocation information received in step S601. If, in step S601, the received radio channel time allocation information includes the radio channel time allocated to the own radio communication device, the process proceeds to step S603. In step S601, when the radio channel time allocated to the own radio communication apparatus is not included in the received radio channel time allocation information, the process is terminated.

[0033] In step S603, the radio channel time allocated to the own radio communication apparatus confirmed in step S602 is extracted. At this time, for example, if there are a plurality of radio channel times assigned to the own radio communication device in step S602, the radio channel time is extracted as soon as possible.

In step S604, the priority of the own wireless communication device in the wireless channel time extracted in step S603 is confirmed. At the radio channel time extracted in step S603 If the highest priority is assigned to the own wireless communication device, the process proceeds to step S608, and communication is started at the start of the wireless channel time extracted in step S603. If there is another wireless communication apparatus to which a higher V priority is assigned than the own wireless communication apparatus in the wireless channel time extracted in step S603, the process proceeds to step S605.

[0035] In step S605, the radio channel time extracted in step S603 is used to confirm the communication status of other radio communication devices assigned higher priority than the own radio communication device in the radio channel time extracted in step S603. At the start of the operation, the wireless channel monitoring is started, and the process proceeds to step S606.

In step S606, the result of monitoring performed in step S605 is confirmed. When it is detected that the wireless channel time extracted in step S603 is higher than the own wireless communication device and other wireless communication devices to which priority is assigned cannot communicate, step S607 Proceed to If normal communication of another wireless communication device assigned a higher priority than the own wireless communication device is detected in the wireless channel time extracted in step S603, the process proceeds to step S602, and the wireless communication device received in step S601 is received. Processing is performed for the radio channel time allocated to the radio communication device other than the radio channel time extracted in the previous step S603, which is included in the channel time allocation information. At this time, as described below, for example, the communication status of the other wireless communication device to which a higher priority is assigned than the own wireless communication device is confirmed.

1. In step S604, the same radio channel time is assigned with a higher priority and the addresses of all the radio communication devices are retained, and the radio communication device addresses are transmitted from the source in the radio channel time. If a packet other than that indicating communication failure set for the address or destination address is observed, normal communication is detected.

2. In step S604, the same radio channel time is assigned with a higher priority and the addresses of all the radio communication devices are retained, and the radio communication device addresses are transmitted from the source in the radio channel time. If a packet indicating communication failure set for the address or destination address is observed, communication failure is detected.

3. Communication is not possible if no communication is confirmed for a certain period from the start of the radio channel time. Is detected.

[0037] In step S607, in the radio channel time extracted in step S603, it is detected that communication is still impossible among the radio communication devices assigned higher priority than the own radio communication device! Check if the communication device is! /. In the wireless channel time extracted in step S603, a higher priority is assigned than the own wireless communication device! If so, proceed to step S608 to start communication immediately. A wireless communication device that has been assigned a higher priority than its own wireless communication device during the wireless channel time extracted in step S603 and has not yet detected a communication failure among the wireless communication devices If there is, the process proceeds to step S605, and the communication status of the radio communication apparatus, which is assigned a higher priority than the own radio communication apparatus in the radio channel time extracted in step S603, is confirmed. At this time, for example, in the process of step S606, a counter is prepared to be updated when a communication failure of a wireless communication device assigned a higher priority than the own wireless communication device is detected, and the value of this counter is confirmed. Thus, a higher priority is assigned than the own wireless communication device, and the wireless communication device detects whether communication is still impossible among the wireless communication devices, and confirms whether the wireless communication device is present.

[0038] In step S608, communication is started, and at the end of the radio channel time extracted in step S603, the process proceeds to step S609 and communication is terminated. Thereafter, the process proceeds to S602 again, and the radio channel assigned to the own radio communication apparatus other than the radio channel time extracted in the previous step S603 included in the radio channel time assignment information received in step S601. Process over time.

The present invention can be applied to the DR of WiMedia, a system that uses the IEEE 802.11 PCA protocol.

[0040] In IEEE 802.11, the wireless control device corresponds to AP, and the previous wireless communication device corresponds to STA. In WiMedia, the wireless control device corresponds to the Owner terminal of DRP Reservation, and the previous wireless communication device corresponds to the Target terminal of DRP Reservation. In wireless USB, the wireless controller is a wireless USB host. The wireless communication device in the previous term will be compatible with wireless USB devices.

[0041] An example in the case where the processes in Figs. 4 and 7 are applied to a wireless USB will be described below.

Wireless USB uses a data structure called WxCTA included in a data structure called Channel Time Allocation IE when the host allocates radio channel time to each device. At this time, in order to allocate radio channel time to a specific device, a type of W CTA called W CTA or W CTA is used. Cha

DR DT

nnel Time Allocation IE format Figure 8, W CTA format Figure 9

DR,

Figure 10 shows the W CTA format. Radio channel time for host to device

DT

When assigning a wireless channel, the host will have a wireless channel in the W Start field of W CTA or W CTA.

DR DT

Set the device address of the wireless USB device to which the wireless channel time set in the wStart field is assigned in the bDevicelD field. Then, this W CTA or Channel Time Allocation IE including W CTA is set to M

DR DT

It is included in a control signal called MC (Micro-Scheduled Management Command) and transmitted by broadcast to all devices within the wireless communication range of the host.

[0042] In the processing of step S504 in Fig. 4, the host has already assigned the wireless channel time extracted in step S502 to one or more devices, and thus the device to which the present invention is applied. To extract. At this time, for example, as described below, it is determined whether the device is applied with the present invention. In the device to which the present invention is applied, a field is newly defined at a position where Offset in the Wireless USB Device Capability Descriptor acquired by the host at the start of the session is 11, and 1 is set in the field. The host to which the present invention is applied checks whether there is a field whose Offset is 11 in the Wireless USB Device Capabilities Descriptor acquired from the device camera at the start of the session, and there is a field whose Offset is 11. When a value of 1 is set in the field, it is determined that the device is applied with the present invention. Figure 11 shows the format of the Wireless USB Capabilities Descriptor.

[0043] Also, in the process of step S505 of Fig. 4, the radio channel time extracted in step S502 is set to the W Start time of the W CTA of the Channel Time Allocation IE or the W CTA. Set the device address of the wireless USB device extracted in step S504 to the W CTA of the Channel Time Allocation IE or b Devicel of the W CTA.

DR DT

Set to D field. The W CTA or W CTA in which the wStart field and bDevicelD field are set in the above process is set in the Channel Time Allocation IE.

DR DT

W CTA or W CT that has already been set and contains the same wS tart field value

DR DT

Place at the end of A. At this time, W CT including the value of the same wStart field

DR

A or W CTA position force wS tart field value indicates the radio channel time indicated

DT

Indicates the priority.

[0044] Then, in the process of step S508 in Fig. 4, the set Channel Time Allocati on IE is included in a control signal called MMC, and is broadcasted to all devices existing within the wireless communication range of the host. To do.

[0045] The device receives the MMC transmitted from the host in the process of step S601 in FIG.

Also, in step S602 in Fig. 7, check whether there is a W CTA or W CTA with its own device address set in the bDevicelD field in the Channel Time Allocation IE included in the MMC received in step S601. . W CTA

DR DT DR

If there is W CTA, go to step S603. W CTA or W CTA

DT DR DT

If there is no, the process ends.

[0046] Then, in the process of step S604 in Fig. 7, all of the W CTA or W CTA including the wireless channel time value extracted in step S603 in the wStart field is bDevic.

DR DT

To extract the location of W CTA or W CTA that includes its device address in elD

DR DT

Check the priority.

Claims

The scope of the claims

[1] In a wireless communication system comprising a wireless control device and one or more wireless communication devices that communicate using a time division multiplex communication method,

Provided in the radio control apparatus, assigns the same radio channel period to the one or more radio communication apparatuses with different priorities, and notifies the allocation information to the one or more radio communication apparatuses, respectively. An allocation notification means;

A certain radio channel period provided in each of the one or more radio communication devices

Monitoring means for monitoring the communication status of the wireless communication device, higher than the own wireless communication device!

Each of the one or more wireless communication devices is communicated with the wireless control device using a wireless channel period in which the highest priority is given to the own wireless communication device. A communication means for performing communication using a wireless channel period assigned to a wireless communication device that has become unable to communicate when a wireless communication device with a high priority is disabled;

A wireless communication system comprising:

2. The wireless communication system according to claim 1, wherein the notifying unit assigns a radio channel period with high V and priority to a radio communication apparatus that has previously requested assignment of the radio channel period. .

[3] The notification means is obtained by subtracting from the radio channel period the communication time of a signal to which a radio channel period for transmission has already been allocated and the time required for switching to a new radio communication device. 2. The wireless communication according to claim 1, wherein among wireless communication devices capable of completing communication within a time period, a wireless channel period is allocated by assigning the highest priority to the wireless communication device and giving priority to the wireless communication device. system.

[4] The radio according to claim 1, wherein the notification unit assigns a radio channel period by giving a high priority to the radio communication device according to a type of data to be communicated. Communications system.

[5] The priority according to the type of data is given in the order of voice, video, and text to a wireless communication device that performs high-immediate data communication. The wireless communication system according to claim 4, wherein the wireless communication system is assigned.

[6] The monitoring means is configured such that the same radio channel period as the radio channel period assigned to the own radio communication apparatus is assigned with a higher priority, and the radio communication apparatus is assigned the same radio channel period. When it is detected that the transmission source address or transmission destination address of a packet indicating that communication is not possible for the period, it is confirmed that communication is not possible in the wireless communication device to which the higher priority is assigned. The wireless communication system according to claim 1, characterized in that:

[7] When the monitoring means detects that the wireless communication apparatus is assigned a higher priority than the own wireless communication apparatus and is not communicating for a certain period of time, the higher priority is assigned. 2. The radio communication system according to claim 1, wherein communication failure in the assigned radio communication apparatus is confirmed.

[8] In a wireless control device that communicates with one or more wireless communication devices using a time division multiplex communication method,

An allocation notification means for allocating the same radio channel period to the one or more radio communication devices with different priorities and notifying the allocation information to the one or more radio communication devices;

A wireless control device comprising:

[9] Using the time division multiplex communication method, the same radio channel period is assigned to one or more wireless communication devices with different priorities, and this allocation information is notified to one or more wireless communication devices. In a wireless communication device that communicates with a wireless control device comprising an assignment notification means for

Monitoring means for monitoring the communication state of the wireless communication device, which is given a higher priority than the wireless communication device for a certain wireless channel period;

The wireless communication device communicates with the wireless control device using the wireless channel period in which the highest priority is given to the wireless communication device, and the wireless communication device with higher priority than the wireless communication device communicates at that time. Communication means assigned to a wireless communication device that cannot communicate when it is disabled, and performing communication using a wireless channel period;

A wireless communication apparatus comprising:

[10] In a wireless communication method in a wireless communication system comprising a wireless control device and one or more wireless communication devices that communicate using a time division multiplex communication method,

In the radio control apparatus, the same radio channel period is allocated to the one or more radio communication apparatuses with different priorities, and the allocation information is notified to the one or more radio communication apparatuses,

In each of the one or more wireless communication devices, for a certain radio channel period, the communication state of the wireless communication device having a higher priority than the own wireless communication device is monitored, and in each of the one or more wireless communication devices The wireless communication device communicates with the wireless control device using the wireless channel period in which the highest priority is given to the wireless communication device, and the wireless communication device with higher priority than the wireless communication device communicates at that time. If it becomes impossible, communication is performed using the wireless channel period assigned to the wireless communication device that cannot communicate!

A wireless communication method.

[11] In a communication method of a wireless control device that communicates with one or more wireless communication devices using a time division multiplex communication method,

The same radio channel period is allocated to the one or more radio communication devices with different priorities, and the allocation information is notified to the one or more radio communication devices, respectively.

Communicate with a specific wireless communication device using the assigned radio channel period based on the notified priority!

A wireless method characterized by the above.

[12] Using the time division multiplex communication method, the same radio channel period is assigned to one or more wireless communication devices with different priorities, and this allocation information is notified to one or more wireless communication devices. In accordance with a communication method of a wireless communication device that communicates with a wireless control device having an assignment notification means for

For a certain radio channel period, the communication status of the radio communication device, which is given higher priority than the own radio communication device, is monitored,

Using the radio channel period in which the highest priority is given to its own radio communication device, Communicate with the line controller,

If a wireless communication device with a higher priority than the wireless communication device at that time becomes incapable of communication, communication is performed using the wireless channel period assigned to the wireless communication device incapable of communication.

A communication method characterized by the above.