WO2014061831A1 - データ配信システム、ルート無線機および無線機 - Google Patents
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- WO2014061831A1 WO2014061831A1 PCT/JP2013/082467 JP2013082467W WO2014061831A1 WO 2014061831 A1 WO2014061831 A1 WO 2014061831A1 JP 2013082467 W JP2013082467 W JP 2013082467W WO 2014061831 A1 WO2014061831 A1 WO 2014061831A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a data distribution system for distributing data.
- Digital signage needs to periodically update content in order to perform product advertisements, guidance, news reports, information distribution, advertisements, etc. in an information display device.
- a digital signage terminal when a digital signage terminal is installed at each sales floor in a retail store for advertising, in order to use WLAN technology in which the digital signage terminal is directly connected to a content distribution server as an access point, the communication range of the content distribution server is set. It is necessary to install a digital signage terminal. Therefore, by combining multi-hop communication technology, it is possible to install digital signage terminals in places that cannot be directly connected to the content distribution server, and to enjoy the benefits of communication continuity due to route redundancy, etc. Become. By adopting such a connection form and distributing the contents to be displayed and the schedule to each digital signage terminal, it is possible to simplify installation.
- each terminal that receives the multicast data individually returns a reception response, and the server that transmits the multicast retransmits the multicast data as necessary by looking at the reception response.
- the relay unit when data is distributed by multi-hop, the relay unit accumulates data from the distribution server, and the relay unit distributes the data by proxy according to an instruction from the distribution server. Techniques for reducing are disclosed.
- the relay device for proxy distribution distributes by multicast in the same manner as the distribution server, and uses the multicast communication retransmission function described above.
- the present invention has been made in view of the above, and an object thereof is to obtain a data distribution system capable of reducing retransmission traffic when data is distributed by multicast.
- the present invention provides a root wireless device as a root access point and a plurality of wireless devices capable of receiving data directly from the root wireless device or via other wireless devices.
- a data distribution system forming a tree-structured wireless network with the root wireless device at the top, wherein the root wireless device receives and decodes wireless signals from the plurality of wireless devices Based on connection information and reception responses from the wireless signal receiving means, data acquisition means for acquiring data to be distributed from the distribution server, and lower-level wireless devices that are the plurality of wireless devices, the wireless network configuration and data distribution
- a distribution status management means for generating and holding a management table for managing the status, and instructing retransmission of data based on the management table or other
- a proxy delivery determination unit that determines whether or not to perform a proxy delivery of data to a wire machine, and a radio that is to be subjected to the proxy delivery is selected based on the management table, and control is performed to instruct the proxy delivery radio to perform the proxy delivery.
- Proxy distribution radio selection means distribution method selection means for selecting a data distribution method of the proxy distribution radio, and controlling the data distribution method to the proxy distribution radio, and modulating data to be distributed
- a wireless signal transmitting means for transmitting a wireless signal, wherein the wireless device receives a wireless signal transmitted from the root wireless device or another wireless device and decodes it into data
- decoding Storage means for storing the received data, and for the subordinate radio connected to the subordinate of the own machine based on the proxy delivery instruction and the data delivery method instruction from the root radio, Whether to retransmit the data based on the proxy distribution means for controlling the distribution of the data stored in the network, the number of hops for the proxy distribution instruction from the root radio, and the reception status of the distributed data in the subordinate radio
- Retransmission determination means for determining whether to notify the route wireless device of data distribution status, and transmitting a wireless signal by modulating data to be distributed, connection information with other wireless devices, and a reception response to the received data And a wireless signal transmitting means.
- the data distribution system according to the present invention has an effect of reducing retransmission traffic when distributing data by multicast.
- FIG. 1 is a diagram illustrating a configuration example of a data distribution system.
- FIG. 2 is a diagram illustrating a configuration example of a wireless device of the root AP.
- FIG. 3 is a diagram illustrating a configuration example of a wireless device that is not a root AP.
- FIG. 4 is a diagram illustrating a configuration example of the management table.
- FIG. 5 is a flowchart showing processing for selecting a proxy delivery wireless device.
- FIG. 6 is a flowchart showing processing for selecting a data distribution method.
- FIG. 1 is a diagram illustrating a configuration example of a data distribution system according to the present embodiment.
- the data distribution system includes wireless devices 101 to 117, a distribution server 118, and a wired network 119.
- Radio units 101 to 117 constitute a radio network capable of multi-hop communication.
- the wireless network has a tree structure and is sequentially connected to a wireless device having a small number of wireless transfers to the wired network 119.
- the wireless device 101 connected to the wired network 119 is referred to as a root AP (Access Point).
- the wireless device 101 is connected to the distribution server 118 via the wired network 119 and receives data distribution from the distribution server 118.
- wireless devices 102, 103, and 104 are connected to the wireless device 101, wireless devices 105 and 106 are connected to the wireless device 102, and wireless devices 106 and 107 are connected to the wireless device 103.
- a wireless device 107 is connected to the wireless device 104.
- the wireless device 106 is connected to the wireless device 102 and the wireless device 103, and the wireless device 107 is connected to the wireless device 103 and the wireless device 104, but the routing of unicast communication is AODV ( Ad hoc On-Demand Distance Vector)
- AODV Ad hoc On-Demand Distance Vector
- FIG. 2 is a diagram illustrating a configuration example of the wireless device 101 that is the root AP.
- the wireless device 101 includes a wireless signal reception unit 201, a wired signal transmission / reception unit 202, a distribution status management unit 203, a proxy distribution determination unit 204, a proxy distribution wireless device selection unit 205, a distribution method selection unit 206, a wireless A signal transmission unit 207.
- the radio signal receiving unit 201 receives radio signals from other radio devices (lower radio devices) and decodes them into data.
- the wireless signal includes connection information, a reception response, and the like.
- the wired signal transmission / reception unit 202 transmits / receives data to / from the wired network 119.
- the distribution status management unit 203 generates and holds a management table for managing the network configuration and the data distribution status based on the connection information from the lower-level wireless device and the data reception status (reception response) information. Based on the management table of the distribution status management unit 203, the proxy distribution determination unit 204 determines whether to instruct the lower-level radio apparatus to perform retransmission or to perform other proxy distribution.
- the proxy delivery wireless device selection unit 205 selects a wireless device to perform proxy delivery, and performs control to instruct the proxy delivery wireless device to perform proxy delivery.
- the distribution method selection unit 206 selects a data distribution method in the radio selected as the proxy distribution radio, and performs control for instructing the data distribution method to the proxy distribution radio.
- the wireless signal transmission unit 207 modulates data and transmits a wireless signal.
- the wired signal transmission / reception unit 202 can transmit and receive data to and from the wired network 119 side, but it is sufficient that at least data to be distributed can be acquired from the distribution server 118. Further, the wireless device 101 acquires data to be distributed from the distribution server 118 via the wired network 119, but the present invention is not limited to this, and the data may be acquired via the wireless network.
- FIG. 3 is a diagram illustrating a configuration example of the lower-layer wireless devices 102 to 117 that constitute the tree structure of the wireless network that is not the root AP.
- the wireless device 102 includes a wireless signal reception unit 301, a storage unit 302, a proxy distribution unit 303, a retransmission determination unit 304, and a wireless signal transmission unit 305.
- the radio signal receiving unit 301 receives a radio signal broadcast or individually transmitted from one or a plurality of higher-level radios and decodes it into data.
- the storage unit 302 stores the data decoded by the wireless signal reception unit 301 for proxy delivery.
- the proxy delivery unit 303 performs control to broadcast or individually transmit the data stored in the storage unit 302 to the lower order radio device in response to a proxy delivery instruction from the higher order radio device. Based on the number of hops in the proxy delivery instruction from the upper radio and the reception status of the distributed data in the lower radio, retransmission determination section 304 determines whether to retransmit the data or notify the upper radio of the delivery status To do.
- the wireless signal transmission unit 305 modulates data, connection information with other wireless devices, a reception response to the received data, and transmits a wireless signal.
- a higher-level wireless device refers to a wireless station that forms a wireless network at a higher level than the own device
- a lower-level wireless device refers to a wireless station that forms a wireless network at a lower level than the own device.
- the higher radio may be the upper radio and the lower radio may be the lower radio.
- the wireless device 101 periodically transmits a notification signal after turning on the power.
- Information indicating that it is the root AP is added to the broadcast signal to be transmitted.
- the wireless devices 102, 103, and 104 located in a range where the notification signal transmitted by the wireless device 101 can be received, authenticate with the wireless device 101 or an authentication server (not shown) existing on the network, and the wireless device 101 is connected.
- the wireless devices 102, 103, and 104 periodically transmit notification signals after connecting to the root AP (wireless device 101). Information that is itself a group of level 2 is given to the broadcast signal to be transmitted.
- Radio units 105, 106, and 107 that exist at positions where radio device 101 cannot receive the notification signal receive a layer 2 notification signal transmitted by radio unit 102 or the like and are present on the layer 2 wireless device or network. Authenticate with the authentication server that does not, and connect to the layer 2 radio.
- the radio devices 105, 106, and 107 periodically transmit notification signals after connecting to the layer 2 radio device.
- Information that is a group of the hierarchy 3 is assigned to the broadcast signal to be transmitted.
- a hierarchical network is similarly configured.
- the radio devices 108, 109, 110, 111, and 112 that exist at positions where the notification signal of the wireless device 101 cannot be received are received from the layer 3 notification signal transmitted by the wireless device 105 or the like, the wireless devices on the layer 3 wireless device or the network And an authentication server (not shown) existing in FIG.
- the radio devices 108, 109, 110, 111, and 112 periodically transmit a notification signal after connecting to the layer 3 radio device.
- Information that is a group of the hierarchy 4 is given to the broadcast signal to be transmitted.
- the wireless devices 113, 114, 115, 116, and 117 existing at positions where the wireless device 101 cannot receive the notification signal receive the layer 4 notification signal transmitted by the wireless device 108 or the like, the wireless devices on the layer 4 wireless device or the network Authentication is performed with an authentication server (not shown) that is connected to the wireless device at level 4.
- the radio devices 113, 114, 115, 116, 117 periodically transmit a notification signal after being connected to the layer 4 radio device.
- Information that is itself a group of level 5 is given to the broadcast signal to be transmitted.
- the wireless device 106 can detect the notification signal from the wireless device 102 and the wireless device 103, and the wireless device 107 can detect the notification signal from the wireless device 103 and the wireless device 104. Therefore, the wireless devices 106 and 107 belong to two higher-order wireless devices, respectively, and secure a plurality of (here, two) routes. The same applies to the wireless device 110 in the hierarchy 4 and the wireless device 115 in the hierarchy 5. Unicast communication routing is determined using AODV, which is an existing routing protocol.
- the wireless devices 102 to 117 notify the wireless device 101 as the root AP of connection information.
- FIG. 4 is a diagram illustrating a configuration example of the management table.
- the device ID of the wireless device managed by the management table is a MAC address unique to the wireless device.
- information on the transmission state, reception state, received data Bitmap (reception Bitmap), and received power between the upper and lower wireless devices connected is managed for each layer.
- the distribution status management unit 203 manages the transmission status as “unsent” (initial state) or “completed”.
- the reception state is managed as “no reception” (initial state), “incomplete” or “completed”.
- the reception Bitmap is a Bitmap of a response (reception response) transmitted by each wireless device when distributed from the upper wireless device.
- the received power is the received power with the host radio that is periodically notified.
- the wireless device 101 transmits the data acquired from the distribution server 118 in the wired signal transmission / reception unit 202 by multicast from the wireless signal transmission unit 207.
- the wireless signal transmission unit 207 assigns a common sequence number to the data to be transmitted so that the reception response from the received wireless device and the overlap of the received data can be determined.
- the distribution status management unit 203 updates the transmission state from “not transmitted” to “completed” in the item of the hierarchy 1 of the management table.
- the wireless device 101 actually transmits data to be distributed after being modulated into a wireless signal by the wireless signal transmission unit 207.
- data For simplicity, the description will be made assuming that “data” is transmitted and received. The same applies to the wireless devices 102 to 117.
- the wireless devices 102, 103, and 104 can receive data transmitted from the wireless device 101 by multicast.
- the data decoded by the wireless signal receiving unit 301 is stored in the storage unit 302, and the received data is “1” and the unsuccessful data is “0” in the bitmap.
- the wireless signal transmitting unit 207 individually transmits a frame for confirming the received data to the wireless devices 102, 103, and 104.
- the wireless devices 102, 103, and 104 respond (receive response) the bitmap stored in the storage unit 302 as data from the wireless signal transmission unit 305.
- the wireless device 101 updates the contents of the management table of the distribution status management unit 203 based on the reception responses from the wireless devices 102, 103, and 104, it determines that the proxy distribution determination unit 204 retransmits itself, Data that could not be received by each wireless device from the wireless signal transmission unit 207 is individually retransmitted, and distribution of the lower wireless devices 102, 103, and 104 immediately below it is completed.
- the reception state of each of the wireless devices 102, 103, and 104 of the lower wireless device information is “completed” in the item of layer 1.
- the radio device 101 instructs the subordinate radio devices 102, 103, and 104 to perform proxy delivery.
- the proxy delivery wireless device selection unit 205 selects one wireless device from the wireless devices 102, 103, and 104 that have not yet been delivered by proxy.
- the distribution method selection unit 206 selects the data distribution method for the selected wireless device, and the wireless signal transmission unit 207 issues a distribution instruction to the selected wireless device including the data distribution method. put out.
- the distribution status management unit 203 updates the transmission state of the selected wireless device from “untransmitted” to “completed” in the item of layer 2 of the management table.
- FIG. 5 is a flowchart showing processing for selecting a proxy delivery wireless device.
- FIG. 6 is a flowchart showing processing for selecting a data distribution method.
- Each flowchart is an example, and each selection process is not limited to this process.
- the wireless device 101 will be described from the state after the delivery of the direct lower wireless devices 102, 103, 104 is completed.
- the transmission state of the upper radio information is “completed” and the reception state of the lower radio information is updated to “complete” in the item of layer 1.
- the information to be acquired is: X1: number of subordinate radios “not received” connected to the upper radio 102 (2), Y1: “incomplete” subordinate radio connected to the upper radio 102 Number (0), Z1: Average received power ( ⁇ 50) of “no reception” subordinate radio connected to the upper radio 102 and “uncompleted” subordinate radio.
- the proxy delivery wireless device selection unit 205 acquires the information of the wireless device 103 from the level 2 item of the management table.
- the information to be acquired is: X2: Number of subordinate radios “not received” connected to the upper radio 103 (2), Y2: “Unfinished” subordinate radio connected to the upper radio 103 Number (0), Z2: Average received power ( ⁇ 65) of “no reception” subordinate radio and “incomplete” subordinate radio connected to the upper radio 103.
- step S107 No
- the proxy delivery wireless device selection unit 205 acquires information on the wireless device 104 from the level 2 item of the management table.
- the information to be acquired is: X3: number of subordinate radios “not received” connected to the upper radio 104 (1), Y3: lower radio of “incomplete” connected to the upper radio 104 Number (0), Z3: Average received power ( ⁇ 50) of “no reception” subordinate radio connected to the upper radio 104 and “uncompleted” subordinate radio.
- step S105 if Y ⁇ Yi, that is, the higher-order radio currently being determined has a larger number of lower-level radios that are “incomplete” than the stored radio (step S105: Yes), In step S107, when Z ⁇ Zi, that is, the higher-order radio currently being determined has a higher average received power of the lower radio of “no reception” and the lower radio of “incomplete” than the stored radio (Step S107: Yes), the proxy delivery wireless device selection unit 205 updates the stored information to the information of the upper wireless device that is currently determined (Step S108).
- Proxy delivery wireless device selecting section 205 increments the count of i by 1 (step S109).
- the distribution method selection unit 206 reads the X, Y, and Z information stored in the proxy distribution radio selection unit 205 (step S201).
- the distribution method selection unit 206 selects transmission of all data, that is, distribution of data by multicast (step S207). ).
- the distribution method selection unit 206 does not have “no reception” and “incomplete” radio devices, that is, data distribution is completed. Do not select a delivery method because it is in a state.
- Radio 101 transmits, by radio signal, proxy delivery by the data delivery method selected by delivery method selection unit 206 to radio 102 that is the proxy delivery radio selected by proxy delivery radio selection unit 205 by the above method. This is instructed via the unit 207.
- the wireless device 102 that has received the distribution instruction from the wireless device 101 transmits the data received from the wireless device 101 stored in the storage unit 302 by multicast from the wireless signal transmission unit 305 under the control of the proxy distribution unit 303. .
- the wireless signal transmission unit 305 assigns a common sequence number to the data to be transmitted so that it is possible to determine whether the received data is duplicated from a plurality of wireless devices.
- the wireless devices 105 and 106 can receive data transmitted from the wireless device 102 by multicast.
- the data decoded by the wireless signal receiving unit 301 is stored in the storage unit 302, and the received data is stored in the bitmap as “1” and the unsuccessful data is stored as “0”. Keep it.
- the wireless signal transmission unit 305 individually transmits a frame for confirming the received data to the wireless devices 105 and 106.
- the wireless devices 105 and 106 respond (receive response) the bitmap stored in the storage unit 302 as data from the wireless signal transmission unit 305.
- the wireless device 102 Under the control of the retransmission determination unit 304, the wireless device 102 adds data information that the wireless devices 105 and 106 could not receive, and notifies the wireless device 101 of transmission completion from the wireless signal transmission unit 305.
- the proxy delivery wireless device selection unit 205 determines that the wireless device 105 only receives the wireless device 102 distribution based on the information on the data that could not be received from the wireless device 102 and the management table of the distribution status management unit 203. Since the data can be received, the wireless device 105 is determined to have the wireless device 102 retransmit the data.
- the proxy delivery wireless device selection unit 205 also allows the wireless device 106 to receive data by distribution of the wireless devices 102 and 103, and the wireless device 103 needs to distribute data for the wireless device 107. In 106, since the same effect as retransmission is obtained by data distribution from the wireless device 103, the wireless device 106 is determined not to be retransmitted.
- the wireless device 101 notifies the wireless device 102 of retransmission to the wireless device 106 from the wireless signal transmission unit 207.
- the wireless device 102 Upon receiving the notification from the wireless device 101, the wireless device 102 completes the retransmission to the wireless device 105 and notifies the wireless device 101 of the completion of transmission.
- the wireless device 101 When receiving the transmission completion notification from the wireless device 105, the wireless device 101 updates the management table of the distribution status management unit 203.
- the distribution status management unit 203 updates the transmission state of the wireless device 102 in the upper wireless device information to “completed” and updates the reception state of the wireless device 105 of the lower wireless device information to “completed”.
- the wireless device 101 sends a distribution instruction to the wireless device 102, but the wireless device 101 knows that the wireless device 105 can only receive data from the wireless device 102. Therefore, the wireless device 101 includes data included in the information of the device ID of the wireless device to be retransmitted, that is, the MAC address of the wireless device 105, in the notification when sending the distribution instruction to the wireless device 102, and the data that the wireless device 105 cannot receive. If there is, an instruction may be issued in advance to resend. Thereby, it is possible to reduce the overhead of a retransmission instruction for a wireless device that does not have a plurality of routes in the wireless network.
- the wireless device 102 notifies the wireless device 101 of data information that the wireless devices 105 and 106 could not receive.
- Retransmission may be determined independently from the relationship between the number of hops to and the amount of data to be retransmitted. As a result, when it is necessary to hop in multiple stages in order to notify the wireless device 101, if the time for retransmitting data is short, the overhead of the retransmission instruction can be reduced.
- the wireless device 101 selects a wireless device that performs proxy delivery next from the selection method based on the flowchart shown in FIG.
- the wireless device 101 selects the wireless device 103 as the proxy delivery wireless device.
- the delivery method is also selected based on the flowchart shown in FIG.
- the wireless device 107 receives data for the first time, but the wireless device 106 receives data that could not be received from the wireless device 102. can do. Thereby, traffic can be reduced by the amount of retransmission data from the wireless device 102.
- the wireless device 103 notifies the wireless device 101 in the same way as the wireless device 102 if there is data that the wireless device 106 cannot receive after distribution.
- the wireless device 106 can receive data by distribution from the wireless devices 102 and 103, but since these two wireless devices have already been distributed, the other wireless device is acting as a proxy. It is known that the wireless device 106 cannot receive data even if the distribution is performed.
- the proxy delivery determination unit 204 determines to perform proxy delivery.
- the proxy delivery wireless device selection unit 205 has a wireless device (in this case, a wireless device) having good communication quality with the wireless device 106 among the wireless devices 102 and 103 connected to the wireless device 106. 102) is selected and an instruction is issued to retransmit only the data that has not been received. Thereby, the wireless device 106 can finally receive all the data.
- a wireless device in this case, a wireless device
- the wireless device 103 when there is data that cannot be received by the wireless device 107 at the time of distribution, the wireless device 103 notifies the wireless device 101 in the same manner as described above.
- the wireless device 107 can receive data by distribution from the wireless devices 103 and 104, but the wireless device 103 has already been distributed, and the wireless device 104 is targeted for wireless transmission. Since only the wireless device 107 is present, it is known that if all data is distributed from the wireless device 104, the data already received by the wireless device 107 is wasted.
- the proxy delivery determination unit 204 determines to perform proxy delivery.
- the proxy delivery wireless device selection unit 205 selects a wireless device (here, the wireless device 104) having good communication quality with the wireless device 107 among the wireless devices 103 and 104 connected to the wireless device 107. Select and instruct to retransmit only data that has not been received. Thereby, the wireless device 107 can finally receive all the data.
- the wireless device 101 serving as the root AP instructs the subordinate wireless device to perform proxy delivery of data
- the wireless device 101 is connected to the lower wireless device.
- the proxy delivery radio is sequentially selected and the data delivery method is selected.
- Embodiment 2 the wireless device 101 that is the root AP manages the wireless device to be distributed next, the retransmission, and the like according to the reception status of the lower wireless device.
- the role of the root AP is passed to the lower-level wireless device. A different part from Embodiment 1 is demonstrated.
- the wireless device 101 that is the root AP is the most connected wireless device that has not yet been distributed in the lower layers among the wireless devices in the layer 3 that configure the wireless network.
- a part of the management table of the distribution status management unit 203 is notified to the wireless device (in this case, the wireless device 105), and the proxy distribution instruction is delegated.
- the wireless device 105 receives the wireless device 105 from the wireless signal transmission unit 207 as a part of the management table of the distribution status management unit 203 under the control of the proxy delivery wireless device selection unit 205.
- 108, 109, 110 are connected, wireless device 113 is connected to wireless device 108 in the lower hierarchy, wireless devices 114, 115 are connected to wireless device 109, and wireless device 115 is connected to wireless device 110.
- the information that it is present is extracted and notified.
- the wireless device 101 notifies the contents of the management table up to two layers, but if there is a lower layer, the information may be notified.
- the wireless device 105 transmits data to the lower wireless devices 108, 109, and 110 connected to the wireless device 105 by the same operation as the wireless device 101 of the first embodiment.
- the wireless device 105 instructs the wireless devices 108, 109, and 110 to perform proxy delivery to the wireless device connected to the lower level of each wireless device.
- the selection of the proxy delivery wireless device and the data delivery method is the same as in the first embodiment (flowcharts in FIGS. 5 and 6).
- the wireless device 105 notifies the wireless device 101 that the transmission of data to the notified wireless device is completed.
- the wireless device 101 as the root AP delegates the authority to instruct proxy delivery to the lower-level wireless device.
- these transfer times can be reduced, and the delivery time can be shortened.
- the load on the wireless device 101 can be reduced.
- the wireless device 101 delegates the authority to instruct proxy delivery to a plurality of wireless devices in the lower hierarchy as well as one wireless device in the lower hierarchy, that is, a part of the management table. It is also possible to notify information. For example, in the case of two radios in a certain hierarchy, there is no duplication for all radios connected to a lower hierarchy, that is, when radios connected to a lower hierarchy are independent of each other, the radio 101 Can give the authority of the proxy delivery instruction to the two wireless devices.
- the wireless device 105 can receive data by distributing data, and the wireless device 106 receives data by distributing data.
- the wireless device 101 cannot perform simultaneous distribution because it causes interference if the wireless devices 105 and 106 are given the authority of the proxy distribution instruction at the same time.
- the wireless device that can be received by the wireless device 105 distributing data and the wireless device that can be received by distributing the data by the wireless device 107 do not overlap. There is no opportunity. Therefore, the wireless device 101 can perform simultaneous distribution because there is no interference even if the authority of the proxy distribution instruction is given to the wireless device 105 and the wireless device 107 at the same time.
- the same management as described above is performed on the wireless device 105 as a part of the management table of the distribution status management unit 203 from the wireless signal transmission unit 207 under the control of the proxy delivery wireless device selection unit 205.
- the wireless devices 107 and 112 are connected to the wireless device 107 and the wireless devices 116 and 117 are connected to the lower-layer wireless device 112. The information that is being extracted is extracted and notified.
- the root AP A certain radio 101 can delegate the authority to instruct proxy delivery to a plurality of subordinate radios. As a result, even if a plurality of lower-level wireless devices perform distribution at the same time, interference does not occur, and distribution efficiency can be improved.
- Embodiment 3 In the first and second embodiments, the method of transmitting data from the higher-level radio device to the lower-level radio device has been described. In the present embodiment, data is transmitted from a subordinate radio device or the like of the radio device to a radio device in which the radio condition has changed and data from the upper radio device can no longer be received. A different part from Embodiment 1, 2 is demonstrated.
- the distribution status management unit 203 receives a reception response from each wireless device, but there is no reception response when there is a wireless device that does not have a reception response to data distribution from the upper wireless device.
- the wireless device deterioration of wireless quality or failure of the wireless device is assumed.
- the wireless device 101 under the control of the proxy delivery wireless device selection unit 205, the wireless device 101 receives, from the wireless signal transmission unit 207, data with a device ID of a wireless device that has no reception response, that is, data provided with MAC address information, Notify radio devices in the upper layer, the same layer, and lower layers of the non-radio devices.
- the upper-layer radio device normally distributes data to a radio device that is not normally connected in the wireless network shown in FIG. 1, FIG. 4 or the like, that is, a radio device having no reception response. There is no radio.
- each of the upper layer, the same layer, and the lower layer wireless devices transmits a notification signal from the wireless signal transmission unit 305. Then, each radio device in the upper layer, the same layer, and the lower layer has received the notification signal in the radio device having no reception response and the radio quality between the radio device having no reception response and the own device. Information is returned from the wireless signal transmission unit 305 to the wireless device 101 as a response.
- the proxy delivery wireless device selection unit 205 is a wireless device having no reception response among the wireless devices receiving the notification signal in the wireless device having no reception response.
- a wireless device with good wireless quality is selected, and control is performed to instruct the selected wireless device to distribute data to a wireless device having no reception response.
- the wireless device instructed to distribute the data may be distributed after performing authentication with the wireless device having no reception response, or a format that can be received by all the wireless devices is prepared in advance. You may distribute in that format.
- the wireless device 101 serving as the root AP performs data distribution. It is assumed that data distribution is instructed from any one of the upper hierarchy, the same hierarchy, and the lower hierarchy of an unreceived radio. As a result, it is possible to distribute data even to a wireless device that cannot receive data from a higher-layer wireless device connected via a wireless network.
- the wireless device 101 as the root AP holds the management table and gives an instruction such as proxy delivery.
- the present invention is not limited to this.
- the same effect can be obtained even if a control device having the same function as the wireless device 101 is installed in a wired or wireless network.
- the configuration of the wireless device 101 can be the same memory or CPU as other wireless devices, the cost of the wireless device can be reduced.
- the data distribution system according to the present invention is useful for data distribution by multicast, and is particularly suitable for content distribution.
- 101 wireless device (root AP), 102-117 wireless device, 118 distribution server, 119 wired network, 201 wireless signal reception unit, 202 wired signal transmission / reception unit, 203 distribution status management unit, 204 proxy distribution determination unit, 205 proxy distribution wireless Machine selection unit, 206 distribution method selection unit, 207 wireless signal transmission unit, 301 wireless signal reception unit, 302 storage unit, 303 proxy distribution unit, 304 retransmission determination unit, 305 wireless signal transmission unit.
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Abstract
Description
図1は、本実施の形態のデータ配信システムの構成例を示す図である。データ配信システムは、無線機101~117と、配信サーバ118と、有線ネットワーク119と、から構成される。無線機101~117は、マルチホップ通信が可能な無線ネットワークを構成する。ここでは、無線ネットワークはツリー構造とし、有線ネットワーク119への無線の転送回数が少ない無線機に順次接続していくものとする。図1において、有線ネットワーク119に接続されている無線機101をルートAP(Access Point)と称する。無線機101は、有線ネットワーク119を介して配信サーバ118と接続し、配信サーバ118からデータの配信を受ける。
I:「未送信」の上位無線機の数
i:「未送信」の上位無線機の識別番号
X:保存している「受信なし」の下位無線機の数
Y:保存している「未完了」の下位無線機の数
Z:保存している「受信なし」の下位無線機と「未完了」の下位無線機の平均受信電力
Xi:上位無線機iに接続している「受信なし」の下位無線機の数
Yi:上位無線機iに接続している「未完了」の下位無線機の数
Zi:上位無線機iに接続している「受信なし」の下位無線機と「未完了」の下位無線機の平均受信電力
実施の形態1では、ルートAPである無線機101が下位無線機の受信状況により次に配信する無線機、再送等の管理を行っていた。本実施の形態では、マルチホップの段数が増加し、代理配信の指示、完了通知の転送に時間がかかる場合に、ルートAPの役割を下位無線機に渡す。実施の形態1と異なる部分について説明する。
実施の形態1,2では、上位無線機から下位無線機へデータを送信する方法について説明した。本実施の形態では、無線状況が変化し、上位無線機からのデータを受信できなくなった無線機に対して、その無線機の下位の無線機等からデータを送信する。実施の形態1,2と異なる部分について説明する。
Claims (13)
- ルートアクセスポイントであるルート無線機と、前記ルート無線機から直接又は他の無線機経由でデータを受信可能な複数の無線機と、から構成され、前記ルート無線機を頂点とするツリー構造の無線ネットワークを形成するデータ配信システムであって、
前記ルート無線機は、
前記複数の無線機からの無線信号を受信して復号する無線信号受信手段と、
配信サーバから配信するデータを取得するデータ取得手段と、
前記複数の無線機である下位無線機からの接続情報および受信応答に基づいて、前記無線ネットワークの構成およびデータの配信状況を管理する管理テーブルを生成して保持する配信状況管理手段と、
前記管理テーブルに基づいて、データの再送を指示するか他の無線機にデータの代理配信をさせるかを判定する代理配信判定手段と、
前記管理テーブルに基づいて、代理配信させる無線機を選択し、代理配信無線機に対して代理配信を指示する制御を行う代理配信無線機選択手段と、
前記代理配信無線機のデータ配信方法を選択し、前記代理配信無線機に対してデータ配信方法を指示する制御を行う配信方法選択手段と、
配信するデータを変調して無線信号を送信する無線信号送信手段と、
を備え、
前記無線機は、
前記ルート無線機または他の無線機から送信された無線信号を受信してデータに復号する無線信号受信手段と、
復号されたデータを記憶する記憶手段と、
前記ルート無線機からの代理配信指示およびデータ配信方法の指示に基づいて、自機の下位に接続する下位無線機に対して、前記記憶手段に記憶しているデータを配信する制御を行う代理配信手段と、
前記ルート無線機からの代理配信指示にかかるホップ数および配信したデータの下位無線機における受信状況に基づいて、データを再送するか前記ルート無線機にデータの配信状況の通知を行うかを判定する再送判定手段と、
配信するデータ、他の無線機との接続情報、および受信したデータに対する受信応答を変調して無線信号を送信する無線信号送信手段と、
を備えることを特徴とするデータ配信システム。 - 前記ルート無線機では、
前記配信状況管理手段が、前記管理テーブルにおいて、機器固有の識別子を用いて下位無線機をツリー構造の階層で管理し、各階層における無線機と下位無線機との送信状態、各下位無線機における受信状態、受信したデータのBitmap、受信電力を管理する、
ことを特徴とする請求項1に記載のデータ配信システム。 - 前記ルート無線機では、
前記代理配信無線機選択手段が、前記管理テーブルに基づいて、前記代理配信無線機に対して、あらかじめ再送を指示しておく、
ことを特徴とする請求項1に記載のデータ配信システム。 - 前記ルート無線機では、
前記代理配信無線機選択手段が、前記管理テーブルに基づいて、下位無線機に対して当該下位無線機より下位に接続する無線機の情報を前記管理テーブルから抽出して通知し、当該下位無線機に対して、当該下位無線機より下位に接続する無線機に代理配信を指示する権限を委任する、
ことを特徴とする請求項1に記載のデータ配信システム。 - 前記ルート無線機では、
前記代理配信無線機選択手段が、複数の下位無線機においてそれぞれの下位無線機のさらに下位に接続する無線機に重複がない場合、前記複数の下位無線機に対して、代理配信を指示する権限を委任する、
ことを特徴とする請求項4に記載のデータ配信システム。 - 前記ルート無線機では、
前記代理配信無線機選択手段が、上位の無線機からデータを受信できない無線機がある場合、データ未受信の無線機より上位階層の他の上位の無線機、前記データ未受信の無線機と同じ階層にある他の無線機、または、前記データ未受信の無線機より下位階層の無線機から、前記データ未受信の無線機との通信状態に基づいて、前記データ未受信の無線機に対してデータを配信する無線機を選択する、
ことを特徴とする請求項1から5のいずれか1つに記載のデータ配信システム。 - ルートアクセスポイントであるルート無線機と、前記ルート無線機から直接又は他の無線機経由でデータを受信可能な複数の無線機と、から構成され、前記ルート無線機を頂点とするツリー構造の無線ネットワークを形成するデータ配信システムの前記ルート無線機であって、
前記複数の無線機からの無線信号を受信して復号する無線信号受信手段と、
配信サーバから配信するデータを取得するデータ取得手段と、
前記複数の無線機である下位無線機からの接続情報および受信応答に基づいて、前記無線ネットワークの構成およびデータの配信状況を管理する管理テーブルを生成して保持する配信状況管理手段と、
前記管理テーブルに基づいて、データの再送を指示するか他の無線機にデータの代理配信をさせるかを判定する代理配信判定手段と、
前記管理テーブルに基づいて、代理配信させる無線機を選択し、代理配信無線機に対して代理配信を指示する制御を行う代理配信無線機選択手段と、
前記代理配信無線機のデータ配信方法を選択し、前記代理配信無線機に対してデータ配信方法を指示する制御を行う配信方法選択手段と、
配信するデータを変調して無線信号を送信する無線信号送信手段と、
を備えることを特徴とするルート無線機。 - 前記配信状況管理手段が、前記管理テーブルにおいて、機器固有の識別子を用いて下位無線機をツリー構造の階層で管理し、各階層における無線機と下位無線機との送信状態、各下位無線機における受信状態、受信したデータのBitmap、受信電力を管理する、
ことを特徴とする請求項7に記載のルート無線機。 - 前記代理配信無線機選択手段が、前記管理テーブルに基づいて、前記代理配信無線機に対して、あらかじめ再送を指示しておく、
ことを特徴とする請求項7に記載のルート無線機。 - 前記代理配信無線機選択手段が、前記管理テーブルに基づいて、下位無線機に対して当該下位無線機より下位に接続する無線機の情報を前記管理テーブルから抽出して通知し、当該下位無線機に対して、当該下位無線機より下位に接続する無線機に代理配信を指示する権限を委任する、
ことを特徴とする請求項7に記載のルート無線機。 - 前記代理配信無線機選択手段が、複数の下位無線機においてそれぞれの下位無線機のさらに下位に接続する無線機に重複がない場合、前記複数の下位無線機に対して、代理配信を指示する権限を委任する、
ことを特徴とする請求項10に記載のルート無線機。 - 前記代理配信無線機選択手段が、上位の無線機からデータを受信できない無線機がある場合、データ未受信の無線機より上位階層の他の上位の無線機、前記データ未受信の無線機と同じ階層にある他の無線機、または、前記データ未受信の無線機より下位階層の無線機から、前記データ未受信の無線機との通信状態に基づいて、前記データ未受信の無線機に対してデータを配信する無線機を選択する、
ことを特徴とする請求項7から11のいずれか1つに記載のルート無線機。 - ルートアクセスポイントであるルート無線機と、前記ルート無線機から直接又は他の無線機経由でデータを受信可能な複数の無線機と、から構成され、前記ルート無線機を頂点とするツリー構造の無線ネットワークを形成するデータ配信システムの前記無線機であって、
前記ルート無線機または他の無線機から送信された無線信号を受信してデータに復号する無線信号受信手段と、
復号されたデータを記憶する記憶手段と、
前記ルート無線機からの代理配信指示およびデータ配信方法の指示に基づいて、自機の下位に接続する下位無線機に対して、前記記憶手段に記憶しているデータを配信する制御を行う代理配信手段と、
前記ルート無線機からの代理配信指示にかかるホップ数および配信したデータの下位無線機における受信状況に基づいて、データを再送するか前記ルート無線機にデータの配信状況の通知を行うかを判定する再送判定手段と、
配信するデータ、他の無線機との接続情報、および受信したデータに対する受信応答を変調して無線信号を送信する無線信号送信手段と、
を備えることを特徴とする無線機。
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2013
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- 2013-12-03 CN CN201380064093.8A patent/CN104854911A/zh active Pending
- 2013-12-03 WO PCT/JP2013/082467 patent/WO2014061831A1/ja active Application Filing
- 2013-12-03 US US14/429,198 patent/US20150280931A1/en not_active Abandoned
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JP2007251991A (ja) * | 2001-06-30 | 2007-09-27 | Nokia Inc | マルチホップ無線ネットワークにおいてパケットを配信するための装置及び方法 |
JP2004153312A (ja) * | 2002-10-28 | 2004-05-27 | Ntt Docomo Inc | データ配信方法、データ配信システム、データ受信装置、データ中継装置、データ受信装置及びデータ配信用プログラム |
JP2007266876A (ja) * | 2006-03-28 | 2007-10-11 | Toyota Infotechnology Center Co Ltd | 無線通信方法、無線通信装置、および無線通信プログラム |
WO2009098892A1 (ja) * | 2008-02-08 | 2009-08-13 | Panasonic Corporation | 無線通信基地局装置、無線通信中継装置、無線通信端末装置、パケット再送方法および無線通信システム |
Cited By (3)
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JP2014195181A (ja) * | 2013-03-28 | 2014-10-09 | Oki Electric Ind Co Ltd | 配信装置、配信システム、配信方法および配信プログラム |
JP2022517696A (ja) * | 2019-03-28 | 2022-03-09 | ミツビシ・エレクトリック・アールアンドディー・センター・ヨーロッパ・ビーヴィ | 統合アクセスバックホールノードへのアドミッション制御の動的な帰属方法、コンピュータソフトウェア、及びコンピュータ可読非一時的記録媒体 |
JP7130152B2 (ja) | 2019-03-28 | 2022-09-02 | ミツビシ・エレクトリック・アールアンドディー・センター・ヨーロッパ・ビーヴィ | 統合アクセスバックホールノードへのアドミッション制御の動的な帰属方法、コンピュータソフトウェア、及びコンピュータ可読非一時的記録媒体 |
Also Published As
Publication number | Publication date |
---|---|
US20150280931A1 (en) | 2015-10-01 |
JP5875699B2 (ja) | 2016-03-02 |
CN104854911A (zh) | 2015-08-19 |
JPWO2014061831A1 (ja) | 2016-09-05 |
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