WO2014006664A1 - 通信管理装置、通信管理方法 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
Definitions
- the present invention relates to a communication management device provided for the purpose of managing a communication device operating in a television white space (TVWS) environment and a communication management method thereof, and in particular, a plurality of communication devices that are managed devices are gathered in parallel.
- the present invention relates to a communication management apparatus and a communication management method suitable for a case where a general network structure (mesh network) can be constructed.
- a wireless communication standard that uses the same frequency band as the licensed television broadcasting and can be operated without a license is being studied.
- the secondary user communication device used in such an environment makes an inquiry to the dedicated database regarding, for example, the TV channel in order to confirm that there is no TV signal. That is, the current position information of the communication device is transmitted to the database, and a list of frequencies that can be used (effective) at the position is obtained from the database. Then, a frequency to be used is selected from the frequencies in the list, and wireless communication is performed as a secondary user.
- the mesh network A mode in which all communication devices can connect to the Internet or the like via the Internet is conceivable.
- a plurality of communication devices form a mesh in this way, communication between these communication devices is efficient because communication is completed within the network (mesh network).
- the secondary user who can configure the mesh network needs to manage to maintain the mesh network. Further, since the communication uses white space, management in that sense is also necessary. In particular, maintaining good communication quality in response to changes in the communication environment that can change from moment to moment is considered important as a secondary user who can configure a mesh network in white space.
- the present invention relates to a communication management apparatus and a communication management method provided for the purpose of managing a communication apparatus operating in a television white space (TVWS) environment, and a parallel network structure configured by a plurality of managed apparatuses. It is an object of the present invention to provide a communication management apparatus and a communication management method that can be applied to (mesh network) and can maintain good communication quality in response to a communication environment that can change from moment to moment.
- TVWS television white space
- a communication management device includes an effective frequency indicating each geographical position of a plurality of managed devices to be managed and frequencies that can be used at each geographical position. And means for storing and holding a correspondence list, and common to the two managed devices based on the correspondence list for every combination pair of two managed devices of the plurality of managed devices.
- Identifying the frequency that can be used as a pair-usable frequency means for reporting the pair-usable frequency to each of two managed devices related to the pair-usable frequency, and identifying the combination pair Means for acquiring from each of the plurality of managed devices each of the communication quality that is the quality of communication between the pair of pairs when using the available frequency for the pair; Means for determining, for each combination pair, the pair-usable frequency with the best pair-to-communication quality as the best-to-use frequency and the pair-to-communication quality corresponding to the best-to-use frequency as the best pair communication quality.
- each combination pair based on the information on the best communication quality, and means for specifying all the routes including the route when another managed device is relayed as candidate routes for each combination pair , For each combination pair, means for calculating each path communication quality as the communication quality in each of the candidate paths connecting the combination pair using the best pair utilization frequency, and for each combination pair, A means for selecting a candidate route having the best route communication quality from among the candidate routes as a use route, and communication between the combination pair, In order to perform by the utilization pathway by connecting with communication between the combined pairs with serial best pair available frequencies, and means for instructing each of the plurality of managed devices.
- This communication management device stores and holds a correspondence list that associates each geographical location of a plurality of managed devices to be managed with effective frequencies indicating frequencies that can be used at each geographical location. Then, for every combination pair of two managed devices among a plurality of managed devices, based on the above correspondence list, a frequency that can be commonly used by the two managed devices is determined as a pair usable frequency. As specified. Furthermore, this pair usable frequency is notified to each of the two managed devices related to this pair usable frequency.
- each of the communication quality which is the communication quality between the combination pairs when using the pair available frequency specified by the combination pair, is acquired from each of the plurality of managed devices. Then, for each combination pair, a pair available frequency with the best pair communication quality is defined as the best pair usable frequency, and a pair communication quality corresponding to the best pair use frequency is defined as the best pair communication quality.
- each route communication quality is calculated as the communication quality in each of the candidate routes in which the communication between the combination pairs using the best pair utilization frequency is performed for each combination pair. Further, for each combination pair, a candidate route with the best route communication quality is selected from the candidate routes as a use route.
- each of the plurality of managed devices is instructed to perform communication between the combination pair by a use route connected by communication between the combination pair using the best pair use frequency. According to the communication using such a usage route, it is possible to maintain good communication quality in correspondence with a communication environment that can change from moment to moment.
- each of the communication quality which is the communication quality between the combination pairs when using the available frequency for each pair, is acquired from each of a plurality of managed devices, and based on that, the best pair usage is obtained. This is because the communication route between the combination pairs using the frequency is used as a usage route.
- the communication management method relates to associating each geographical position of a plurality of managed devices to be managed with an effective frequency indicating a frequency that can be used at each geographical position.
- a list is stored and, for every combination pair of two managed devices of the plurality of managed devices, based on the correspondence list, frequencies that can be used in common by the two managed devices, Specify as a pair available frequency, notify the pair usable frequency to each of two managed devices related to the pair usable frequency, and use the pair usable frequency specified in the combination pair
- Each communication quality which is the communication quality between the combination pairs, is acquired from each of the plurality of managed devices, and the communication quality is the best for each combination pair.
- the available frequency is set as the best available frequency, and the communication quality corresponding to the best available frequency is set as the best communication quality, and another managed device is relayed for each combination pair.
- All the routes including the case route are identified as candidate routes for each combination pair, and based on the information on the best pair communication quality, for each combination pair, the combination pair that uses the best pair utilization frequency is used.
- Each path communication quality is calculated as the communication quality in each of the candidate paths that are connected to each other, and the candidate path with the best path communication quality is selected from the candidate paths as the use path for each combination pair.
- the communication between the pair of combinations is selected according to the use path connected by the communication between the combination pair using the best pair use frequency. To perform, instructs each of the plurality of managed devices.
- This communication management method is a management method based on the communication management device described above.
- the communication management apparatus and the communication management method thereof can be changed from moment to moment. It is possible to provide a communication management device and a communication management method capable of maintaining good communication quality corresponding to a communication environment.
- TVWS television white space
- FIG. 3 is an explanatory diagram illustrating a correspondence list between managed devices and available frequencies that can be acquired from the database by the database inquiry unit 13 shown in FIG. 2. Explanatory drawing which shows the usable frequency for every link pair which the test instruction information generation part 14 shown in FIG. 2 can produce
- FIG. 3 is an explanatory diagram showing a usage route for each combination pair selected by the established link determination unit 15 shown in FIG. 2 and a system configuration diagram showing a mesh network reflecting the result.
- FIG. 7 an explanatory diagram showing a use route for each combination pair selected by the established link determination unit 15 shown in FIG. 2, and a system configuration diagram showing a mesh network reflecting the result .
- means for acquiring each geographical location from each of the plurality of managed devices means for transmitting each geographical location to a database, and storing and holding the correspondence list
- it may further comprise means for receiving the correspondence list sent from the database as information corresponding to each geographical location.
- information on each geographical position is acquired from each managed apparatus, and each geographical position is transmitted from the communication management apparatus to a database to make an inquiry.
- the communication management device can make an inquiry to the database.
- the managed device inquires the database about the available frequency and receives information from each managed device according to its geographical location. It is also possible to obtain information on available frequencies, and to collect the correspondence list in the communication management apparatus.
- the apparatus may further include a unit that functions as one managed device among the plurality of managed devices.
- a configuration as a communication management device is provided in one of the managed devices.
- one of parallel communication devices that can form a mesh is also a communication management device. It is.
- the function as the communication management device can be assigned to an independent device, or can be assigned to one of the parallel positioned communication devices that can form a mesh.
- the information processing apparatus may further include means for instructing each of the plurality of managed devices to measure each of the communication quality.
- the information processing apparatus may further include means for instructing each of the plurality of managed devices to measure each of the communication quality.
- an instruction for starting the work is temporarily given in order to change the mesh structure (link state).
- a plurality of managed devices periodically measure the communication quality, and the measurement result is reported to the communication management device each time and the communication management is performed. This can also be stored in the device.
- the communication quality is such that the available frequency can be used, the mutual electric field strength from the other managed device in one managed device related to the communication quality, the pair available The quality is based on one or more information of maximum communication speed, delay, jitter, packet loss rate, bit error rate between the one and the other managed devices when using a frequency. it can. These are specific examples of communication quality. Multiple communication quality can also be used. In addition, when calculating the path communication quality using the communication quality, a certain evaluation function can be used according to the nature of the used communication quality.
- FIG. 1 is a system configuration diagram illustrating a mesh network under a white space in which a communication management apparatus according to an embodiment of the present invention can be provided.
- this system includes managed devices 1, 2, 3, 4 (for example, there are four, but the number is not limited), and a communication management device (mesh manager: MM) 10 And has a database 20.
- the managed devices 1 to 4 are wireless communication devices positioned in parallel with each other, and can be considered as, for example, a base station (BS) or a mobile base station, but are managed by the communication management device 10 (particularly mobile terminals). ). In the case of a (mobile) base station, each of the managed devices 1 to 4 may have a terminal (not shown) that connects to them.
- the managed devices 1 to 4 are configured to operate in a TVWS environment.
- the managed devices 1 to 4 (which may be represented by A to D in the following) can establish a communication link for each of the two combination pairs. Even if all the links shown in the figure are not established, if at least one link is established as viewed from each managed device, communication between any arbitrary managed devices is possible. This is because other managed devices can be used as relay devices.
- the communication management device 10 is provided in a state where it can be connected to any of the managed devices 1 to 4 for the purpose of managing the managed devices 1 to 4. Necessary functions for management will be described in detail later. In short, in a TVWS environment, between any arbitrary managed devices and any route including relay, between the managed devices Is to search for an answer to the question of whether the communication quality is the best, and instruct each managed device 1 to 4 to establish a necessary link according to the result.
- the database 20 is a server provided on the Internet so as to provide at least information on frequencies that can be used without affecting the primary user to secondary users who can be operated in the TVWS environment. It is essential that the available frequencies that are returned do not affect at least the primary user, but it can also be assumed that frequencies already allocated to another secondary user have been removed. In the system shown in FIG. 1, it is assumed that the management apparatus 10 exclusively connects to the database 20. However, it does not exclude that each of the managed devices 1 to 4 is configured to be directly connected to the database 20.
- FIG. 2 is a functional block diagram showing the configuration of the communication management apparatus according to an embodiment of the present invention.
- the communication management device 10 includes a communication function unit 11 with a managed device, a managed device information storage and holding unit 12, a database inquiry unit 13, a test instruction information generation unit 14, and an established link determination unit 15.
- FIG. 2 shows a functional block diagram, but FIGS. 3 to 8 will be referred to as needed when the functions and operations of each of the components in this figure are described below.
- the communication function unit 11 with the managed device first has a function of acquiring each geographical position from each managed device.
- each managed device has at least a function for specifying the current geographical position of the device itself using, for example, a GPS satellite.
- Each acquired geographical position is transferred to the managed device information storage holding unit 12 and stored therein.
- the communication function unit 11 and the managed device information storage holding unit 12 have other important functions, which will be described later.
- Each geographical location of the managed device stored and held in the managed device information storage holding unit 12 is passed to the database inquiry unit 13.
- the database inquiry unit 13 transmits each geographical position passed from the information storage holding unit 12 to the database, and the frequency band that can be used at the position (in addition to the maximum transmission power and other usage conditions in some cases). Make an inquiry.
- the managed device A is a correspondence list in which the available frequency is a according to the geographical position. In general, there can be a plurality of available frequencies a. The same applies to the other managed devices B to D and the usable frequencies b to d. In FIG. 3, “maximum transmission power and other usage conditions” are not shown.
- the correspondence list obtained from the database is stored and held in the database inquiry unit 13 and is also passed to the test instruction information generation unit 14.
- the test instruction information generation unit 14 can use, for each combination pair of two managed devices of the managed devices, a frequency that can be commonly used by the two managed devices based on the correspondence list. Specify as frequency. This will be further described with reference to FIG.
- the frequency that can be used in each link pair can be considered as a frequency that can be commonly used by two related managed devices.
- the link pair is AB, as shown in FIG. , (A ⁇ b) 1 , (a ⁇ b) 2 ,..., (A ⁇ b) nAB can be listed and specified.
- there may be a case where there is no frequency that can be used in common (that is, a) b ⁇ ) and there is no frequency that can be used.
- the above points are the same for other link pairs.
- the test instruction information generation unit 14 transmits the pair-usable frequency specified as described above to the communication function unit 11, so that the communication function unit 11 transmits the pair-usable frequency to two related managed devices. Each is notified together with the identification information of the counterpart managed device. The available frequency becomes part of the instruction information for measuring the communication quality in each managed device.
- Each managed device that has been notified of the available frequency indicates the communication quality that is the quality of communication between the associated combination pairs when using the available frequency, for example, small-scale test data. Actually flow and measure.
- Such communication quality can be exemplified by the maximum communication speed, delay, jitter, packet loss rate, bit error rate, etc. between the two managed devices when the available frequency is used. At least one of these can be used for the communication quality, but a plurality of measurements may be used. In addition, as one of the communication quality, it is possible to use the (mutual) electric field strength from the other managed device in one managed device related to the communication quality that can use the available frequency.
- the measurement of communication quality in each managed device is performed periodically, for example, in all link pairs regardless of whether or not the link state is established.
- the measurement result is acquired from each managed device via the communication function unit 11 (or reported) and acquired and stored (stored) in the managed device information storage unit 12. At least keep the latest.
- the latest information stored and held in this way is as shown in FIG. 5, for example.
- the communication quality Q is associated with each available frequency of each link pair.
- Each of the communication qualities Q is not single but may be plural as described above (that is, when Q is a vector quantity).
- the information shown in FIG. 5 is passed from the storage holding unit 12 to the established link determination unit 15.
- the communication quality of the link pair can be given a numerical value indicating the worst quality for convenience, for example.
- the geographical position is obtained from each managed device, and information on available frequencies ( It is also preferable to periodically perform the operation of obtaining FIG. 3) from the database and notifying the related managed device of the information on the available frequency (FIG. 4) obtained thereby. This is because the position of the managed device may move, or the communication environment may change due to another factor, and the available frequency may also fluctuate.
- the established link determination unit 15 uses the information shown in FIG. 5 passed from the storage holding unit 12 to determine the best communication quality that is the best from the included communication quality for each link pair. Then, the best available frequency, which is the corresponding available frequency, is determined.
- the best communication quality in the link pair AB is expressed as Q AB * and the corresponding best available frequency is expressed as (a * b) *, for all of the link pairs A list as shown in FIG. 6 is obtained.
- a method of applying a weighted average of the elements of the vector quantity and determining by the scalar value is applied. Can do.
- the coefficient for the weighted average can be set and selected as appropriate according to the specifications required for communication.
- the established link determination unit 15 specifies, for each combination pair, all routes including a route when another managed device is relayed as a candidate route for each combination pair. For example, in the case of a combination pair of AB, there are five candidate routes: AB, ACB, ADB, ACDB, ADCB. become. Other combination pairs can be identified in the same manner (see the table in FIG. 7).
- This equation uses the number i of relay devices as a parameter, selects a relay device with (n-2) C i , and the possible route order i! And multiplying the product by ⁇ at the end.
- the established link determination unit 15 based on the best-to-communication quality information as shown in FIG. 6, for each combination pair, candidate paths that connect communication between the combination pairs using the best-pair use frequency.
- Each path communication quality is calculated as the communication quality in each of the above. For example, in a combination pair AB, when the candidate route is ADB, the best communication quality Q AD * of AD and the best communication quality of BD (same as DB) Using QBD * , the path communication quality of ADB can be calculated.
- an evaluation function can be set based on the quality of the quality. For example, if the quality is “delay”, the total route delay amount is the sum of delays in each link pair, and therefore the evaluation function can be set as the sum of delay amounts in each link pair. Also, if the quality is “communication speed”, the link speed with the minimum communication speed becomes the bottleneck for the overall communication speed of the route, and the evaluation function selects the minimum value from the delay amount of each link pair Can be set as a function. Further, if the quality is “bit error rate”, the error rate of the route is calculated. For example, “1- (1-bit error rate AD ) ⁇ (1-bit error rate BD )” An expression evaluation function can be set.
- the established link determination unit 15 selects a candidate route having the best route communication quality from among the candidate routes as a use route for each combination pair. For example, in the list shown in FIG. 7, it is assumed that the candidate route indicated in bold italics is selected as the best route communication quality in each combination pair.
- the communication quality is generally a vector quantity
- the path communication quality is also a vector quantity having the same number of elements.
- the best method can be selected by applying a weighted average of the elements of the vector quantity and making a determination based on the scalar value. The coefficient for the weighted average can be set and selected as appropriate according to the specifications required for communication.
- the established link determination unit 15 performs communication between each pair of combinations by using each of the managed devices in order to perform communication between the link pairs using the best pair utilization frequency by the above-described utilization route. Generate information to instruct.
- This instruction information is transmitted from the established link determination unit 15 to each managed device via the communication function unit 11.
- the network of the managed device enters a state where there are established links and unestablished links. In this case, there are four established links, AB, BC, BD, and CD. If only these links are established, all “selected paths” in the list of FIG. 7 are established. That is, the communication quality between all two managed devices is the best.
- the communication management device that is one embodiment of the present invention has been described above. According to communication between managed devices using the usage route selected as described above, it is possible to maintain good communication quality in correspondence with a communication environment that can change from moment to moment. Originally, each of the communication quality when using the available frequency is obtained from each managed device, and based on this, the communication between the link pairs using the best available frequency is connected. This is because the route is used.
- the link state of the mesh network is established as shown in FIG. 7, if there is any change in the communication environment, another usage route is selected through the process described with reference to FIGS.
- the link state can change as follows. An example after the change is shown in FIG. In this case, there are three established links, AB, AD, and BC. If only these links are established, all “next selection paths” in the list of FIG. 8 are established. That is, the communication quality between all two managed devices is the best.
- the embodiment described above is suitable, for example, when a communication infrastructure is temporarily constructed or when an emergency is dealt with in a disaster.
- a communication infrastructure is temporarily constructed or when an emergency is dealt with in a disaster.
- the best link is automatically established according to changes in the communication environment, thereby enabling a network covering a wide area. Can be built.
- each geographic location is acquired from each managed device, each geographic location is transmitted to the database, and information corresponding to each geographic location is stored and retained.
- the correspondence list sent from the database was received, but it can also be done as follows. That is, when there is a means for connecting to the database for each managed device individually, the managed device inquires the database about the available frequency, and from each managed device, information according to each geographical location is obtained. If information on a certain available frequency is sent, it can be collected as the correspondence list in the communication management device.
- the communication management apparatus exists independently of the managed apparatus.
- the communication management apparatus may function as one managed apparatus among the managed apparatuses. .
- a configuration as a communication management device is provided in one of the managed devices.
- one of the parallel communication devices that can form a mesh is also a management device. is there.
- the function as the communication management device can be assigned to an independent device, or can be assigned to one of the parallel positioned communication devices that can form a mesh.
- the communication management device may be provided with a function for instructing each of the managed devices to measure each communication quality.
- a function for instructing each of the managed devices to measure each communication quality for example, when a change in the communication environment is detected on the side of the communication management device, for example, a temporary instruction is given to start the work in order to change the mesh structure (link state).
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Abstract
Description
10 通信管理装置
11 被管理装置との通信機能部
12 被管理装置情報記憶保持部
13 データベース問合せ部
14 試験指示情報生成部
15 成立リンク判定部
20 データベース
Claims (6)
- 管理対象である複数の被管理装置の各地理的位置と、該各地理的位置で利用可能な周波数を示す有効周波数とを対応づける対応リストを記憶保持する手段と、
前記複数の被管理装置のうちの2つの被管理装置のすべての組み合わせ対ごとに、前記対応リストに基づいて、該2つの被管理装置で共通に利用可能な周波数を、対利用可能周波数として特定する手段と、
前記対利用可能周波数を、該対利用可能周波数に関連する2つの被管理装置のそれぞれに報知する手段と、
前記組み合わせ対で特定されている前記対利用可能周波数を用いたときの、該組み合わせ対の間での通信の品質である対通信品質のそれぞれを、前記複数の被管理装置のそれぞれから取得する手段と、
前記組み合わせ対ごとに、前記対通信品質が最良となる前記対利用可能周波数を、最良対利用可能周波数として定め、かつ、該最良対利用周波数に対応する対通信品質を最良対通信品質として定める手段と、
前記組み合わせ対ごとに、他の被管理装置を中継した場合の経路を含めたすべての経路を、該組み合わせ対ごとの候補経路として特定する手段と、
前記最良対通信品質の情報に基づいて、前記組み合わせ対ごとに、前記最良対利用周波数を用いる前記組み合わせ対の間での通信をつないだ前記候補経路のそれぞれにおける通信品質として各経路通信品質を算定する手段と、
前記組み合わせ対ごとに、前記候補経路のうちから前記経路通信品質が最良となる候補経路を利用経路として選択する手段と、
前記組み合わせ対の間での通信を、前記最良対利用周波数を用いた前記組み合わせ対の間での通信でつないだ前記利用経路により行うべく、前記複数の被管理装置のそれぞれに指示する手段と
を具備する通信管理装置。 - 前記複数の被管理装置のそれぞれから、前記各地理的位置を取得する手段と、
前記各地理的位置をデータベースに送信する手段と、
前記対応リストを記憶保持することを目的として、前記各地理的位置に応じた情報として前記データベースから送られてくる前記対応リストを受信する手段と
をさらに具備する請求項1記載の通信管理装置。 - 前記複数の被管理装置のうちのひとつの被管理装置として機能させる手段をさらに具備する請求項1記載の通信管理装置。
- 前記対通信品質のそれぞれを計測するように前記複数の被管理装置のそれぞれに指示する手段をさらに具備する請求項1記載の通信管理装置。
- 前記対通信品質が、前記対利用可能周波数を利用可能な、該対通信品質にかかわる一方の被管理装置における他方の被管理装置からの相互の電界強度、該対利用可能周波数を用いたときの前記一方および他方の被管理装置の間の最高通信速度、遅延、ジッタ、パケットロス率、ビット誤り率のうちのひとつ以上の情報に基づいた品質である請求項1記載の通信管理装置。
- 管理対象である複数の被管理装置の各地理的位置と、該各地理的位置で利用可能な周波数を示す有効周波数とを対応づける対応リストを記憶保持し、
前記複数の被管理装置のうちの2つの被管理装置のすべての組み合わせ対ごとに、前記対応リストに基づいて、該2つの被管理装置で共通に利用可能な周波数を、対利用可能周波数として特定し、
前記対利用可能周波数を、該対利用可能周波数に関連する2つの被管理装置のそれぞれに報知し、
前記組み合わせ対で特定されている前記対利用可能周波数を用いたときの、該組み合わせ対の間での通信の品質である対通信品質のそれぞれを、前記複数の被管理装置のそれぞれから取得し、
前記組み合わせ対ごとに、前記対通信品質が最良となる前記対利用可能周波数を、最良対利用可能周波数として定め、かつ、該最良対利用周波数に対応する対通信品質を最良対通信品質として定め、
前記組み合わせ対ごとに、他の被管理装置を中継した場合の経路を含めたすべての経路を、該組み合わせ対ごとの候補経路として特定し、
前記最良対通信品質の情報に基づいて、前記組み合わせ対ごとに、前記最良対利用周波数を用いる前記組み合わせ対の間での通信をつないだ前記候補経路のそれぞれにおける通信品質として各経路通信品質を算定し、
前記組み合わせ対ごとに、前記候補経路のうちから前記経路通信品質が最良となる候補経路を利用経路として選択し、
前記組み合わせ対の間での通信を、前記最良対利用周波数を用いた前記組み合わせ対の間での通信でつないだ前記利用経路により行うべく、前記複数の被管理装置のそれぞれに指示する
通信管理方法。
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US14/412,413 US9544781B2 (en) | 2012-07-05 | 2012-11-28 | Communication management device and communication management method |
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CA2878229A1 (en) | 2014-01-09 |
JP2014017540A (ja) | 2014-01-30 |
SG11201500021WA (en) | 2015-03-30 |
EP2871878A4 (en) | 2016-06-01 |
EP2871878B1 (en) | 2017-07-26 |
US20150230097A1 (en) | 2015-08-13 |
JP5896377B2 (ja) | 2016-03-30 |
EP2871878A1 (en) | 2015-05-13 |
US9544781B2 (en) | 2017-01-10 |
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