WO2008059558A1 - Système de communication sans fil - Google Patents

Système de communication sans fil Download PDF

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Publication number
WO2008059558A1
WO2008059558A1 PCT/JP2006/322581 JP2006322581W WO2008059558A1 WO 2008059558 A1 WO2008059558 A1 WO 2008059558A1 JP 2006322581 W JP2006322581 W JP 2006322581W WO 2008059558 A1 WO2008059558 A1 WO 2008059558A1
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WO
WIPO (PCT)
Prior art keywords
wireless communication
wireless
radio
communication device
communication
Prior art date
Application number
PCT/JP2006/322581
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English (en)
Japanese (ja)
Inventor
Daisuke Watanabe
Yoshikazu Motomura
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2006/322581 priority Critical patent/WO2008059558A1/fr
Publication of WO2008059558A1 publication Critical patent/WO2008059558A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria

Definitions

  • the present invention relates to a radio communication system using a time division multiplexing communication method.
  • 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.
  • wireless USB which is a standard for high-speed short-distance wireless communication, and this wireless USB is only on the network.
  • 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.
  • MAS Media Access Slot
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • FIG. 11 Wireless USB Device Capabilities data structure format.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present invention.
  • a wireless communication device C201 and a wireless communication device C202 perform wireless communication with a wireless control device C101 via a wireless channel.
  • the wireless control device C101 is a wireless USB host such as a personal computer
  • 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.
  • 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.
  • 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
  • Device C201 communicates.
  • 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.
  • the time T1 power also reaches time T2. Monitoring of the communication status of the first wireless communication device C201 during End.
  • the second radio assigned the period from time ⁇ 2 to time ⁇ 3 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 ⁇ 2 to time ⁇ ⁇ ⁇ ⁇ 3 by the control signal wirelessly transmitted by the first wireless control device C101 is the period from time ⁇ 2 to time ⁇ 3.
  • the communication status of the second wireless communication apparatus C202 assigned with higher priority is monitored.
  • 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 ⁇ 2 to time ⁇ 3, detects that communication cannot be performed from time ⁇ 2 to time ⁇ 3.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the wireless communication device is extracted from the wireless communication device list.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the priority at each radio channel time is indicated by the order of the radio communication device list at each radio channel time.
  • 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.
  • 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.
  • 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.
  • step S502 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.
  • the number of wireless communication devices set up to that point is The number of wireless communication devices that can be allocated to time.
  • 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.
  • 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.
  • FIG. 7 is a flowchart showing an example of communication processing of the wireless communication apparatus according to the embodiment of the present invention.
  • 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.
  • 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.
  • 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.
  • step S604 the priority of the own wireless communication device in the wireless channel time extracted in step S603 is confirmed.
  • 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.
  • 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.
  • the wireless channel monitoring is started, and the process proceeds to step S606.
  • step S606 the result of monitoring performed in step S605 is confirmed.
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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.
  • the wireless control device corresponds to AP, and the previous wireless communication device corresponds to STA.
  • 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.
  • the wireless controller is a wireless USB host. The wireless communication device in the previous term will be compatible with wireless USB devices.
  • 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
  • FIG. 10 shows the W CTA format. Radio channel time for host to device
  • the host When assigning a wireless channel, the host will have a wireless channel in the W Start field of W CTA or W CTA.
  • MC Micro-Scheduled Management Command
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the device receives the MMC transmitted from the host in the process of step S601 in FIG.
  • 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
  • W CTA If there is W CTA, go to step S603. W CTA or W CTA
  • 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.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

Quand un dispositif de commande sans fil (C101) et des dispositifs de communication sans fil (C201, C202) utilisent une communication avec un multiplexage par répartition dans le temps pour communiquer entre eux, le dispositif de commande sans fil (C101) attribue des intervalles de canal sans fil aux dispositifs de communication sans fil (C201, C202). A ce stade, quand le dispositif de commande sans fil (C101) attribue un intervalle de canal sans fil au dispositif de communication sans fil (C201), il lui attribue également une priorité d'utilisation de cet intervalle de canal sans fil. De manière similaire, quand le dispositif de commande sans fil (C101) attribue un intervalle de canal sans fil au dispositif de communication sans fil (C202), il lui attribue également une priorité d'utilisation de cet intervalle de canal sans fil. Chaque intervalle de canal sans fil est utilisé par le dispositif de communication sans fil qui a reçu la plus grande priorité. Quand le dispositif de communication sans fil, qui a reçu la plus grande priorité, ne peut plus réaliser de communication, un autre dispositif de communication sans fil, qui surveille l'état de communication de ce dispositif de communication sans fil et qui présente la deuxième plus grande priorité, utilise cet intervalle de canal sans fil pour réaliser la communication.
PCT/JP2006/322581 2006-11-13 2006-11-13 Système de communication sans fil WO2008059558A1 (fr)

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PCT/JP2006/322581 WO2008059558A1 (fr) 2006-11-13 2006-11-13 Système de communication sans fil

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Application Number Priority Date Filing Date Title
PCT/JP2006/322581 WO2008059558A1 (fr) 2006-11-13 2006-11-13 Système de communication sans fil

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106464473A (zh) * 2014-05-23 2017-02-22 高通股份有限公司 在增强型分布式信道接入中发信令通知软时分复用
WO2023024922A1 (fr) * 2021-08-24 2023-03-02 广州视源电子科技股份有限公司 Procédé, appareil et système de transmission d'informations reposant sur un fil de port série

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003244753A (ja) * 2002-02-20 2003-08-29 Ntt Docomo Inc チャネル割り当て方法及びチャネル割り当て装置
JP2003258756A (ja) * 2002-03-01 2003-09-12 Nippon Telegr & Teleph Corp <Ntt> センタ局における通信回線割当方法、センタ局装置、通信回線割当プログラム及び該プログラムを記録した記録媒体
JP2006186627A (ja) * 2004-12-27 2006-07-13 Nec Electronics Corp ホスト装置、デバイス装置、通信システム及びデータ送受信方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003244753A (ja) * 2002-02-20 2003-08-29 Ntt Docomo Inc チャネル割り当て方法及びチャネル割り当て装置
JP2003258756A (ja) * 2002-03-01 2003-09-12 Nippon Telegr & Teleph Corp <Ntt> センタ局における通信回線割当方法、センタ局装置、通信回線割当プログラム及び該プログラムを記録した記録媒体
JP2006186627A (ja) * 2004-12-27 2006-07-13 Nec Electronics Corp ホスト装置、デバイス装置、通信システム及びデータ送受信方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106464473A (zh) * 2014-05-23 2017-02-22 高通股份有限公司 在增强型分布式信道接入中发信令通知软时分复用
WO2023024922A1 (fr) * 2021-08-24 2023-03-02 广州视源电子科技股份有限公司 Procédé, appareil et système de transmission d'informations reposant sur un fil de port série

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