WO2017115450A1 - 端末装置、通信制御装置、通信システム、および通信制御方法 - Google Patents
端末装置、通信制御装置、通信システム、および通信制御方法 Download PDFInfo
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- WO2017115450A1 WO2017115450A1 PCT/JP2016/000620 JP2016000620W WO2017115450A1 WO 2017115450 A1 WO2017115450 A1 WO 2017115450A1 JP 2016000620 W JP2016000620 W JP 2016000620W WO 2017115450 A1 WO2017115450 A1 WO 2017115450A1
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- access point
- information
- wireless access
- communication
- connection destination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Definitions
- the present disclosure relates to a terminal device that performs communication via a wireless access point, a communication control device that controls connection of the terminal device to the wireless access point, a communication system including the terminal device and the communication control device, and a connection destination of the terminal device
- the present invention relates to a communication control method for determining a wireless access point.
- a terminal device such as a smartphone can perform wireless communication by appropriately selecting a desired access point from a plurality of access points located in the vicinity.
- a terminal device randomly selects an access point as a connection destination, it may be difficult to connect due to congestion of the selected access point. Depending on the quality and available bandwidth, a desired transmission rate may not be obtained.
- a terminal measures communication quality information with each base station, and the communication quality While the information is transmitted to the management server together with the measurement position information, the management server creates a communication quality database indicating the communication quality of each base station at each position in the area based on the received communication quality information and measurement position information. Edit the map information for the terminal or base station, determine the reliability of the map information, and send the map information and the reliability to the terminal, so that the terminal receives the data when communicating
- a wireless communication system is known that weights communication quality information and map information in consideration of the reliability and selects a base station for communication (Patent Document). Reference).
- the management server combines the information on the communication quality indicating the radio wave state of the wireless communication with the information on the load state (congestion level) of each base station, thereby obtaining the map information.
- the map information acquired from the management server by the terminal to select the base station is the bandwidth ( In other words, the communication speed may not always match the situation, and as a result, the terminal may not be able to select an appropriate base station.
- the present disclosure has been devised in view of the above-described problems of the prior art, and information on past bandwidths accumulated with respect to access points that are candidates for connection destinations and the current bandwidth status with respect to the access points.
- it is a main object to provide a terminal device, a communication control device, a communication system, and a communication control method capable of appropriately selecting a connection destination access point.
- a terminal device of the present disclosure is a terminal device that selects a wireless access point to be connected from a plurality of connectable wireless access points based on communication with a communication control device that controls communication, and a communication execution position
- a transmission unit that transmits terminal information including the information on the communication control device to the communication control device; and reception that receives connection destination candidate information including information on wireless access point candidates corresponding to the communication execution position from the communication control device.
- a bandwidth estimation unit that estimates a bandwidth related to each wireless access point included in the connection destination candidate information, and one or more wireless access points among the wireless access point candidates included in the connection destination candidate information.
- a connection destination selection unit that selects as the connection destination candidate information, the connection destination candidate information includes past information acquired for each candidate of the wireless access point. And the connection destination selection unit selects the one or more wireless access points based on the past band and the estimated band related to each candidate of the wireless access point. .
- the access point of the connection destination of the terminal device can be determined by considering the past bandwidth information accumulated for the access point that is a connection destination candidate and the current bandwidth state of the access point. It becomes possible to select appropriately.
- 1 is an overall configuration diagram of a communication system according to a first embodiment.
- Functional block diagram of a terminal device and a communication control device in the communication system according to the first embodiment Explanatory drawing which shows an example of the access point management list which concerns on 1st Embodiment.
- Explanatory drawing which shows an example of the communication performance list regarding the access point which concerns on 1st Embodiment.
- Explanatory drawing which shows an example of the connection destination candidate list
- FIG. 16 is a flowchart showing details of the connection destination selection (S1006) shown in FIG.
- a first invention made to solve the above problems is a terminal device that selects a wireless access point to be connected from a plurality of connectable wireless access points based on communication with a communication control device that controls communication.
- a transmitting unit that transmits terminal information including communication execution position information to the communication control device; and connection destination candidate information including information on wireless access point candidates corresponding to the communication execution position.
- a receiving unit that receives from the communication control device, a band estimation unit that estimates a current band for each wireless access point included in the connection destination candidate information, and a wireless access point candidate included in the connection destination candidate information
- a connection destination selection unit that selects one or more wireless access points as connection destinations, and the connection destination candidate information includes the wireless access point Information on past bands acquired for each candidate is included, and the connection destination selection unit is configured to use the one or more wireless access points based on the past band and the estimated band for each candidate of the wireless access points. It is characterized by selecting.
- the terminal device According to the terminal device according to the first aspect of the present invention, information on past bandwidths accumulated in the communication control device (that is, including bandwidths related to wireless communication by other terminal devices) with respect to access points that are connection destination candidates, and In consideration of the current bandwidth situation regarding the access point, it is possible to appropriately select the access point to which to connect.
- the band estimation unit estimates the current band based on RTT.
- the terminal device According to the terminal device according to the second aspect of the present invention, it is possible to more reliably estimate the current band based on the RTT.
- the terminal information further includes a peripheral access point detector that detects a peripheral wireless access point that can be connected at the communication execution position.
- Information on the peripheral wireless access points is included, and the wireless access point candidates include the peripheral wireless access points.
- the terminal device when an access point that is a candidate for a connection destination is extracted, an access point that actually exists in the vicinity (particularly, a new access point that is not recognized by the communication control device) is taken into consideration. This makes it possible to more appropriately select a connection destination access point.
- the terminal information is further provided with a cooperative control detection unit that detects the presence or absence of execution of cooperative control for each of the surrounding wireless access points. Includes a detection result related to the cooperative control by the cooperative control detection unit, and the connection destination candidate information includes information on wireless access point candidates corresponding to the detection result related to the cooperative control. To do.
- the terminal device According to the terminal device according to the fourth aspect of the present invention, it is possible to consider the presence / absence of cooperative control of access points that are present in the vicinity when extracting access points that are candidates for connection destinations. It is possible to appropriately select a high-reliability access point that is large and performs cooperative control (that is, a highly reliable band estimation result) as a connection destination.
- the terminal information further includes a channel detection unit for detecting a channel to be used for each of the peripheral wireless access points.
- the channel detection unit includes a channel detection result
- the connection destination candidate information includes wireless access point candidate information corresponding to the channel detection result.
- the terminal device According to the terminal device according to the fifth aspect of the present invention, it is possible to consider the channel of an access point that currently exists in the vicinity when extracting an access point that is a candidate for a connection destination. Connect a highly reliable access point (that is, a highly reliable band estimation result) that uses a channel that is not used by another access point (or a small number of other access points are used). It becomes possible to select appropriately as a destination.
- a highly reliable access point that is, a highly reliable band estimation result
- each of the peripheral wireless access points further includes a noise detection unit that detects a noise level of radio waves
- the terminal information includes: The detection result of the noise level by the noise detection unit is included, and the connection destination candidate information includes information on candidate wireless access points corresponding to the detection result of the noise level.
- the terminal device of the sixth aspect of the present invention when extracting access points that are candidates for connection destinations, it is possible to consider the noise level of access points that currently exist in the vicinity, so that the band estimation result is large.
- an access point with a low noise level that is, a high reliability of the band estimation result
- a seventh invention is characterized in that, in the third invention, the peripheral access point detection unit detects a received signal strength related to the wireless access point.
- the terminal device of the seventh aspect of the invention it is possible to grasp the wireless communication quality of the peripheral access points based on the received signal strength (RSSI) of the peripheral wireless access points that can be connected at the communication execution position.
- RSSI received signal strength
- the transmission unit receives detection information of neighboring wireless access points and information on a band estimated by the band estimation unit. Is transmitted.
- the terminal device According to the terminal device according to the eighth aspect of the present invention, it is possible to easily accumulate the detection information and bandwidth information of the surrounding wireless access points in the communication control device.
- a terminal device for selecting a wireless access point to be connected from a plurality of connectable wireless access points based on communication with a communication control device that controls communication, wherein execution of communication is performed.
- a transmission unit that transmits terminal information including location information to the communication control device, and connection destination candidate information that includes information on wireless access point candidates corresponding to the communication execution location is received from the communication control device.
- a receiving unit a communication quality measuring unit for measuring communication quality related to a wireless access point included in the connection destination candidate information, and at least one wireless access point among wireless access point candidates included in the connection destination candidate information.
- a connection destination selection unit that selects as a connection destination, the transmission unit, the information of the communication quality measured by the communication quality measurement unit Further transmitting to the communication control device, the receiving unit receives information of the band estimated for the wireless access point based on the communication quality information from the communication control device, the connection destination selection unit, The one or more wireless access points are selected based on the estimated bandwidth.
- the information on the past bandwidth accumulated in the communication control device regarding the access point that is a candidate for the connection destination and the current bandwidth status relating to the access point are taken into consideration. As a result, it is possible to appropriately select the connection destination access point.
- a tenth invention is a communication control device for transmitting the connection destination candidate information to the terminal device according to any of the first to ninth inventions.
- the communication control apparatus of the tenth aspect of the present invention it is possible to establish a connection by taking into account the past bandwidth information accumulated for the access point that is a connection destination candidate and the current bandwidth status for the access point. It becomes possible to make the terminal device appropriately select the previous access point.
- the eleventh invention is a communication system including the terminal device according to any of the first to ninth inventions and the communication control device according to the tenth invention.
- the communication system According to the communication system according to the eleventh aspect of the present invention, consideration is given to past bandwidth information accumulated in the communication control apparatus for the access point that is a candidate for the connection destination and the current bandwidth status for the access point. Thus, it is possible to cause the terminal device to appropriately select a connection destination access point.
- a twelfth aspect of the invention is a communication control method related to a terminal device that performs communication via a wireless access point selected based on information from a communication control device, wherein the terminal information including information on the execution position of the communication is A transmission step of transmitting to the communication control device; a reception step of receiving connection destination candidate information including information of wireless access point candidates corresponding to the execution position of the communication from the communication control device; and the connection destination candidate information.
- the connection destination candidate information includes past bandwidths acquired for the wireless access point candidates.
- the one or more wireless access points are selected in the connection destination selection step based on a past band acquired for the wireless access point candidate and the estimated band. .
- the information on the past bandwidth accumulated in the communication control device regarding the access point that is a candidate for the connection destination and the current bandwidth status regarding the access point are taken into consideration. As a result, it is possible to cause the terminal device to appropriately select a connection destination access point.
- a thirteenth aspect of the present invention is a communication control method related to a terminal device that performs communication via a wireless access point selected based on control information from a communication control device, and includes terminal information including information on an execution position of the communication.
- a terminal information transmitting step for transmitting to the communication control device; a candidate information receiving step for receiving connection destination candidate information including information on wireless access point candidates corresponding to the execution position of the communication from the communication control device;
- a communication quality information transmission step for transmitting to the communication control device; and a band information reception step for receiving information on a band estimated for the wireless access point based on the communication quality information from the communication control device,
- the connection destination selection step the one or more wireless access points are selected based on the estimated bandwidth.
- the information on the past bandwidth accumulated in the communication control device for the access point that is a candidate for the connection destination and the current bandwidth status for the access point are considered. As a result, it is possible to cause the terminal device to appropriately select a connection destination access point.
- FIG. 1 is an overall configuration diagram of a communication system 1 according to the first embodiment of the present disclosure.
- the communication system 1 includes a terminal device 2, a base station 3 and an access point 4 that relay wireless communication of the terminal device 2, and communication that can be connected to the terminal device 2 via a communication network 5 such as a telephone network or the Internet. It mainly includes a control device 6.
- the terminal device 2 can be connected to the communication network 5 via the base station 3 and the access point 4.
- connection destination selection processing each Processing for selecting an appropriate connection destination from the plurality of access points 4 is executed in accordance with the communication quality related to the access point, the available bandwidth, and the like.
- the terminal device 2 has a known wireless communication function for executing wireless communication via the base station 3 and the access point 4.
- a smartphone multifunctional mobile phone
- other portable information communication devices such as a tablet PC, a PDA, and a notebook PC can be used.
- FIG. 1 only one terminal device 2 is shown for convenience of explanation, but in practice, the communication system 1 includes a large number of terminal devices.
- the base station 3 is a device that is arranged at the end of the mobile communication network and can relay the wireless communication of the terminal device 2 based on a known mobile communication standard (3G, LTE, etc. for mobile communication), and access Point 4 is a device capable of relaying wireless communication of the terminal device 2 based on a known wireless LAN standard (IEEE802.11a, 11b, 11g, 11n, 11ac, 11ad, etc.).
- the access point 4 includes not only a device managed by a management company that provides a paid or free wireless communication service, but also a device arbitrarily installed in a general store or a house (for example, a router having an access point function) Etc.) may also be included.
- the number and arrangement of the base stations 3 and access points 4 are not limited to those shown in FIG. 1 and can be changed as appropriate.
- the communication control device 6 is a device for controlling communication of the terminal device 2, and in particular, information (or a command) for the terminal device 2 to select an access point to be connected from among the plurality of access points 4. It can be provided to the terminal device 2.
- a server device is used as the communication control device 6, but the present invention is not limited to this, and other computer devices that perform the same function can be used.
- a configuration in which the communication control device 6 directly performs wireless communication with the terminal device 2 without using a telephone network or the Internet is also possible.
- FIG. 2 is a functional block diagram of the terminal device 2 and the communication control device 6 in the communication system 1
- FIG. 3 is an explanatory diagram showing an example of an access point management list
- FIG. 4 is an example of a communication performance list related to access points.
- FIG. 5 is an explanatory diagram illustrating an example of a connection destination candidate list relating to an application.
- the terminal device 2 has the functions of the units 10-15 shown in FIG.
- the position information acquisition unit 10 acquires information on an execution position (here, current position) of wireless communication by the terminal device 2 based on a GPS (Global Positioning System) function provided in the terminal device 2.
- the position information acquisition unit 10 is not limited to a positioning method based on GPS.
- the position information acquisition unit 10 acquires a wireless communication execution position information based on communication with the base station 3 or a transmitter (Bluetooth (registered trademark) beacon).
- a method of grasping the position by receiving a signal periodically transmitted from can be employed.
- the transmission unit 11 can transmit various types of information related to the connection destination selection process to the communication control device 6.
- the transmission unit 11 transmits terminal information including information on an execution position of wireless communication to the communication control device 6.
- the receiving unit 12 can receive various types of information and commands related to the connection destination selection process from the communication control device 6.
- the connection unit 12 includes connection point candidate information corresponding to the communication execution position included in the terminal information. The destination candidate information is received from the communication control device 6.
- the communication quality measurement unit 13 measures the wireless communication quality related to each access point included in the received connection destination candidate information.
- the wireless communication quality is based on, for example, at least one of RSSI (Received Signal Strength Indicator), SNR (Signal-to-Noise Ratio), and packet error rate related to radio waves from the access point 4.
- RSSI Receiveived Signal Strength Indicator
- SNR Signal-to-Noise Ratio
- packet error rate related to radio waves from the access point 4.
- the communication quality measurement unit 13 transmits a measurement packet to the access point 4 via the transmission unit 11, and measures the packet error rate by counting the response of the access point 4 received by the reception unit 12. be able to.
- the bandwidth estimation unit 14 estimates the bandwidth (available bandwidth) related to each access point included in the connection destination candidate information.
- the bandwidth estimation unit 14 measures RTT (Round-Trip delay Time) by transmitting a measurement packet based on Ping or the like from the terminal device 2 to the access point to be measured, and estimates the bandwidth based on this RTT. can do.
- RTT Red-Trip delay Time
- the connection destination selection unit 15 selects an access point as a connection destination from among access point candidates included in the connection destination candidate information.
- the connection destination selection unit 15 normally selects one access point and a connection destination, but it is also possible to select a plurality of access points. Further, the connection destination selection unit 15 can select an access point based on a connection destination selection policy preset by the user of the terminal device 2.
- the terminal device 2 may execute communication with an arbitrary communication partner (for example, a Web server or another terminal device) connected to the communication network 5 via the access point selected as the connection destination. Is possible.
- band priority for preferentially selecting an access point with a larger bandwidth is used, but this is not limiting, and priority is given to an access point with a smaller delay time.
- priority on delay time priority on power consumption to preferentially select access points with lower power consumption, priority on traffic volume to preferentially select access points with more communication performance, priority on access points with lower communication charges
- Priority to select communication charges security priority to preferentially select access points with higher security (encryption method), and greater weighting to the bandwidth included in the connection destination candidate information from the communication control device 6 (or It is also possible to use data performance priority or the like in which the terminal device 2 does not measure the current bandwidth. If a desired access point cannot be selected based on such a connection destination selection policy, the connection destination selection unit 15 does not select a connection destination.
- the terminal device 2 is equipped with the hardware constitutions similar to a well-known smart phone.
- the terminal device 2 includes a processor that executes various information processing and peripheral device control based on a predetermined control program, a RAM (Random Access Memory) that functions as a work area of the processor, and the processor.
- ROM Read Only Memory
- ROM Read Only Memory
- GPS module GPS module
- display device for displaying various information to the user
- touch panel functioning as an input device operated by the user
- auxiliary memory for storing various information and data A device is provided.
- the terminal device 2 includes wireless communication based on known mobile communication standards (3G for mobile communication, LTE, etc.) and known wireless LAN standards (IEEE802.11a, 11b, 11g, 11n, 11ac, 11ad, etc.)
- known wireless LAN standards IEEE802.11a, 11b, 11g, 11n, 11ac, 11ad, etc.
- an antenna and a communication module for wireless communication that can respectively correspond to communication based on Bluetooth (registered trademark) are provided.
- the functions of the units 10-15 of the terminal device 2 as described above are realized by their hardware and a control program executed by the processor.
- the communication control device 6 has the functions of the respective units 20-24 shown in FIG.
- the receiving unit 20 can receive various types of information and requests regarding the connection destination selection process from the terminal device 2, and receives various types of information including terminal information transmitted from the terminal device 2, for example.
- the transmission unit 21 can transmit various information and commands related to the connection destination selection process to the terminal device 2, for example, an access point corresponding to the communication execution position included in the terminal information to the terminal device 2. Connection destination candidate information including information on the candidates is transmitted.
- the information acquisition unit 22 acquires various information necessary for the connection destination selection process from the terminal device 2 and other terminal devices (not shown), the base station 3, the access point 4, and the like via the reception unit 20.
- the various information is stored in the data storage unit 23.
- Information recorded in the data storage unit 23 includes, for example, access point management information, communication performance data related to the access point, and the like.
- the access point management information is configured, for example, as an access point management list as shown in FIG. 3, and the access point management list includes ESSID (Extended Service Set IDentifier) and BSSID (Basic Service Set IDentifier) for each access point. Information such as communication charges, access point management company code, and encryption method.
- ESSID or BSSID is associated with location information of the access point.
- the communication result data regarding the access point is configured as a communication result list of each access point on a predetermined day of the week and date as shown in FIG. 4, for example.
- the communication performance list in FIG. 4 includes RSSI, RTT, and band data for a predetermined day of the week and date and time stored for the access point having BSSID “AAA”.
- the data storage unit 23 is not limited to that shown in FIG. 4 and appropriately stores communication performance data related to access points having a plurality of different BSSIDs.
- the day of the communication performance data is not limited to seven days of the week from Monday to Sunday.
- data relating to holidays can be handled as one group.
- the time interval (3 minute interval in FIG. 4) of the accumulated data can be appropriately changed within a range where the connection destination selection processing accuracy is not deteriorated, for example, 5 minute interval, 30 interval, or 1 hour. It is possible to reduce the amount of data stored by setting a larger interval such as an interval.
- the communication performance data may include communication fee data.
- the RTT of the communication performance data can use an average value of RTTs acquired from a plurality of terminal devices. For example, when data is accumulated at intervals of 3 minutes, the RTT value at time 10:15 (10: The average RTT (10:15) when there are reports from 3 UEs in 3 minutes from 15 can be obtained from the following equation.
- Average RTT (10:15) (UE1_RTT (10:16) + UE2_RTT (10:16) + UE3_RTT (10:17)) / 3
- UE1_RTT (10:16) RTT measured by the terminal device UE1 at time 10:16
- UE2_RTT (10:16) RTT measured by the terminal device UE2 at time 10:16
- UE3_RTT (10:17) RTT measured by the terminal device UE3 at time 10:17
- the value of RTT at time 10:15 can also be obtained from the following equation in consideration of the past RTT value.
- Average RTT (10:15) ⁇ ⁇ average RTT (10:15) + (1- ⁇ ) ⁇ DB_RTT (10:15)
- ⁇ Weight coefficient of instantaneous value by terminal device 2
- DB_RTT (10:15) Average RTT value at the time of 10:15 up to the last week by the communication control device 6
- RTT (10:15) Average RTT value for 3 minutes from the current time of 10: 15-10: 17
- the RTT of the communication performance data is not limited to the average value of the RTT acquired from a plurality of terminal devices, and a maximum value, a minimum value, or the like may be used.
- the candidate information extraction unit 24 extracts access point candidates corresponding to the communication execution position included in the terminal information from the terminal device 2, and generates connection destination candidate information related to the extracted access points.
- the candidate information extraction unit 24 refers to the management information of the plurality of access points stored in the data storage unit 23 and the communication result data regarding the plurality of access points, and performs communication by the terminal device 2. It is possible to extract an access point determined to be connectable from the execution position and the communication execution time (here, the current time on the current day).
- the connection destination candidate information is configured, for example, as a connection destination candidate list relating to an access point as shown in FIG. 5, and this connection destination candidate list includes ESSID, BSSID, bandwidth, communication fee, and access point management for each access point. Information such as the operator code and encryption method is included.
- the communication control device 6 has the same hardware configuration as a known server device.
- the communication control device 6 includes a processor that executes various information processing and peripheral device control based on a predetermined control program, a RAM that functions as a work area of the processor, a control program and data that the processor executes.
- a processor that executes various information processing and peripheral device control based on a predetermined control program
- a RAM that functions as a work area of the processor
- a control program and data that the processor executes.
- FIG. 6 is a control sequence diagram relating to the connection destination selection processing of the communication system 1
- FIG. 7 is an explanatory diagram showing an example of a requested bandwidth list relating to an application
- FIG. 8 is an explanation showing a modification of the connection destination candidate list relating to the application.
- the terminal device 2 When the terminal device 2 starts communication via the access point 4, it can first connect to the communication control device 6 via the base station 3 (that is, the mobile communication network). The terminal information is transmitted to the communication control device 6 (S1001).
- the communication control device 6 that has acquired the terminal information from the terminal device 2 extracts the access point determined to be connectable from the communication execution position and the communication execution time (here, the current position and the current time) of the terminal device 2. Thus, connection destination candidate information (connection destination candidate list) relating to the extracted access points is generated (S1002). Thereafter, the communication control device 6 transmits the connection destination candidate information to the terminal device 2 (S1003).
- the terminal device 2 measures the wireless communication quality related to each access point included in the received connection destination candidate information (S1004). Subsequently, the terminal device 2 estimates a band related to each access point included in the connection destination candidate information (S1005).
- the terminal device 2 uses information related to access point candidates included in the connection destination candidate information (past band performance, etc.), wireless communication quality measurement results, and band estimation results. Then, one or more access points are selected from among the access point candidates included in the connection destination candidate information (S1006). In S1006, when there is one available wireless standard (for example, only IEEE802.11ac), the terminal device 2 finally selects one. Further, if there are two or more available wireless standards (for example, IEEE802.11ac, IEEE802.11ad, etc.), they can be selected.
- the terminal device 2 transmits the communication quality information including the wireless communication quality measurement result and the band estimation information including the band estimation result to the communication control device 6 (S1007).
- the communication control device 6 updates (or newly adds) access point management information and communication result data regarding the access point based on the information.
- the terminal device 2 uses the communication control device as information on the requested bandwidth of an application that is executed when wireless communication is performed (that is, data transmission / reception via wireless communication is required). 6 can be transmitted.
- the requested bandwidth information is configured, for example, as a requested bandwidth list as shown in FIG. 7.
- this requested bandwidth list for example, each of video, AR (Augmented Reality) / VR (Virtual Reality), Web browsing, game, etc.
- a requested bandwidth and a desired bandwidth time are set for the application.
- the terminal device 2 can transmit a requested bandwidth of 20 Mbps and a desired delay time of 5 ms to the communication control device 6 as terminal information.
- connection destination candidate information in consideration of the required bandwidth of 20 Mbps (ie, extracts an access point having a bandwidth of 20 Mbps or more) in S1002.
- the connection destination candidate information is configured as a connection destination candidate list including access points ranked according to the size of the band as shown in FIG. 8, for example.
- band estimation in S1005 is not limited to the method described above, and for example, the band (estimated value) Rate can also be obtained from the following equation.
- Rate C_RTT ⁇ ⁇ ⁇ F_RTT (NowRTT) + (1- ⁇ ) ⁇ DB_Rate
- ⁇ Weight coefficient of instantaneous value by terminal device 2
- ⁇ Weight coefficient of band data from the communication control device 6 (connection destination candidate information)
- C_RTT Coefficient F_RTT: Function that calculates the bandwidth from RTT
- NowRTT Instantaneous RTT measured by the terminal device 2
- DB_Rate Band data acquired from the communication control device 6 (connection destination candidate information)
- Bandwidth (estimated value) Packet size for bandwidth estimation [byte] x 2 x 8 / RTT [s]
- the initial bandwidth estimation packet size (window size) can be determined based on the RTT value from the communication control device 6.
- the window size can be converged early.
- FIG. 9 is a functional block diagram of the terminal device 2 in the communication system according to the second embodiment of the present disclosure
- FIG. 10 is a control sequence diagram of the communication system
- FIG. 11 illustrates an example of a detection list of peripheral access points. It is explanatory drawing.
- symbol is attached
- matters not particularly mentioned below are the same as those in the first embodiment.
- the terminal device 2 further includes a peripheral AP (access point) detection unit 31 that detects a connectable peripheral access point at the communication execution position of the terminal device 2. This is different from the case of the first embodiment.
- a peripheral AP (access point) detection unit 31 that detects a connectable peripheral access point at the communication execution position of the terminal device 2. This is different from the case of the first embodiment.
- the terminal device 2 detects the connectable peripheral access points before transmitting the terminal information to the communication control device 6, thereby including the detected access point information.
- AP information is generated (S1010).
- the peripheral AP information is configured as a peripheral access point detection list as shown in FIG. 11, for example, and the peripheral access point detection list includes information such as the ESSID and RSSI of each detected access point.
- the terminal device 2 transmits peripheral AP information as terminal information together with the communication execution position to the communication control device 6 (S1001).
- the communication control device 6 actually creates a connection destination candidate access point around the terminal device 2 based on the peripheral AP information received from the terminal device 2 in the generation of connection destination candidate information about the access point (S1002). It is possible to consider existing access points (in particular, new access points that are not recognized by the communication control device). As a result, in the connection destination candidate information transmitted from the communication control device 6 to the terminal device 2 in S1003, access points around the terminal device 2 (particularly, new access points not yet recognized by the communication control device 6). Can be included.
- FIG. 12 is a functional block diagram of a terminal device and a communication control device in a communication system according to the third embodiment of the present disclosure
- FIG. 13 is a control sequence diagram of the communication system.
- symbol is attached
- matters not particularly mentioned below are the same as those in the above-described first embodiment.
- the band estimation unit 14 of the terminal device 2 is omitted, while the band estimation unit 14 is provided in the communication control device 6. It is different from the case of.
- the communication control device displays the communication quality information including the measurement result of the wireless communication quality. 6 (S1011).
- the communication control device 6 estimates the band based on the RTT included in the received communication quality information (S1005).
- the communication control device 6 transmits band estimation information including a band estimation result to the terminal device 2 (S1012).
- the terminal device 2 determines the connection destination based on the connection selection policy from the information on the access point candidates included in the connection destination candidate information (past band performance, etc.), the wireless communication quality measurement result, and the band estimation result.
- One or more access points are selected as connection destinations from the access point candidates included in the candidate information (S1006).
- the communication control device 6 can correct the band estimated based on the communication quality information in S1005 based on the communication performance data related to the access point stored in the data storage unit 23.
- the measurement result of the wireless communication quality transmitted to the communication control device 6 in S1011 may be RSSI.
- the communication control device 6 can estimate the band based on RSSI in S1005. .
- FIG. 14 is a functional block diagram of the terminal device 2 in the communication system according to the fourth embodiment of the present disclosure
- FIG. 15 is a control sequence diagram of the communication system
- FIG. 16 illustrates an example of a cooperative control level estimation list. It is explanatory drawing. 14 and 15, the same reference numerals are given to the same components as those shown in FIGS. 2 and 6 (first embodiment) described above. In addition, regarding the communication system according to the fourth embodiment, matters not particularly mentioned below are the same as those in the above-described first embodiment.
- coordinated control means that the access point adaptively controls the channel, bandwidth, transmission power, carrier sense threshold, or subordinate terminal used by the access point according to the status of the surrounding access points and terminals. It is.
- the terminal device 2 As shown in FIG. 14, in the terminal device 2 according to the fourth embodiment, cooperative control detection for detecting whether or not cooperative control is performed for each of the peripheral access points connectable at the communication execution position of the terminal device 2.
- the first embodiment is further provided with a unit 41, a channel detection unit 42 for detecting a channel used by each peripheral access point, and a noise detection unit 43 for detecting a noise level of radio waves of each peripheral access point. It is different from the case of form.
- the terminal device 2 is not limited to the configuration illustrated in FIG. 14, and may be any configuration including at least a part of the cooperative control detection unit 41, the channel detection unit 42, and the noise detection unit 43. Further, at least some of the functions of the cooperative control detection unit 41, the channel detection unit 42, and the noise detection unit 43 can be replaced by the communication quality measurement unit 13.
- the terminal device 2 detects the reliability of the surrounding band estimation (or the reliability of the access point) before transmitting the terminal information to the communication control device 6.
- the reliability information including the reliability information is generated (S1020). Note that the execution timing of S1020 can be changed as appropriate, and may be at least before the band estimation (S1005).
- the reliability information includes information on the presence / absence of execution of cooperative control for each access point (hereinafter referred to as “cooperative control detection information”), duplication of channels used by each access point (the number of access points using the same channel). ) (Hereinafter referred to as “channel usage information”), information regarding the noise level of the radio wave of the access point (hereinafter referred to as “noise level information”), and information regarding RSSI regarding each access point. included.
- the terminal device 2 transmits reliability information to the communication control device 6 together with the communication execution position as terminal information (S1001).
- the communication control device 6 can extract connection point candidate access point candidates based on the reliability information received from the terminal device 2 in the generation of connection destination candidate information related to the access point (S1002). It becomes.
- the communication control device 6 extracts, as a candidate for an access point based on the cooperative control detection information, an access point that is executing cooperative control in preference to an access point that is not executing cooperative control. can do. Further, for example, the communication control device 6 can preferentially extract access points with less duplication of the channels used as access point candidates based on the channel use information. Further, for example, the communication control device 6 can preferentially extract an access point having a lower noise level as an access point candidate based on the noise level information.
- connection destination candidate information transmitted from the communication control device 6 to the terminal device 2 in S1003 includes only access point candidates in which the above-described reliability information is considered (that is, higher reliability). It will be.
- the terminal device 2 notifies the peripheral access point of the presence / absence of execution of cooperative control (for example, presence / absence of a quality information acquisition command (IEEE802.11k), channel roaming notification (IEEE802.11r), channel disconnection).
- the access point can add information on the presence or absence of execution of its own cooperative control to the beacon signal.
- the terminal device 2 changes parameters (for example, channel, bandwidth, RTS threshold, transmission power, ABF (Analogue Beam Forming), etc.) used for cooperative control from neighboring access points (default values). Whether or not the cooperative control is executed can be determined based on the information.
- parameters for example, channel, bandwidth, RTS threshold, transmission power, ABF (Analogue Beam Forming), etc.
- the terminal device 2 can also detect (estimate) whether or not the cooperative control is executed based on the MAC address information of the access point, for example.
- the terminal device 2 can access the plurality of access points. Can be determined as “execution of cooperative control”.
- the terminal device 2 designates the plurality of access points as “execution of cooperative control”. It may be determined as “Yes”.
- the terminal device 2 determines whether or not the cooperative control is performed by the number of parameters used for the cooperative control (for example, when the number of parameters is larger than a predetermined threshold, it is determined that “cooperative control is performed”). It is possible to determine the certainty. Further, the terminal device 2 can determine the certainty of whether or not the cooperative control is performed depending on the type of parameter. For example, as shown in FIG. 16, it is possible to set a cooperative control level for the types of parameters used for the cooperative control, and to set the reliability of the access point based on those cooperative control levels. For example, the terminal device 2 is configured such that the reliability is low when the cooperative control level is 1; the reliability is medium when the cooperative control level is 2; and the reliability is high when the cooperative control level is 3. Can do.
- FIG. 17 is a flowchart showing details of the connection destination selection (S1006) shown in FIG.
- the terminal device 2 has the same bandwidth (estimated value) in S1005 as the bandwidth based on the connection destination candidate information from the communication control device 6 regarding the access point to be selected (the difference between them is It is determined whether it is within a predetermined threshold (ST101). Therefore, when the bandwidth (estimated value) is equal to the bandwidth based on the connection destination candidate information (Yes), the terminal device 2 selects the access point to be selected as the connection destination (ST102).
- the terminal device 2 determines the reliability detected (estimated) in S1020 and the reliability based on the connection destination candidate information (past And the reliability is improved (the reliability detected in S1020 is higher) (ST103). If the reliability is improved (Yes), the terminal device 2 selects the access point to be selected as a connection destination (ST102).
- the terminal device 2 calculates the bandwidth of the access point based on the reliability detected in S1020 (ST104), and the calculated value of the bandwidth is the terminal device. 2 determines whether or not the requested bandwidth of the application being executed in step 2 is satisfied (ST105). Therefore, when the calculated bandwidth value satisfies the requested bandwidth (Yes), the terminal device 2 selects the access point to be selected as a connection destination (ST102).
- the calculation of the access point bandwidth based on the reliability in ST104 is, for example, a coefficient corresponding to the degree of reliability decrease (the difference between the reliability based on the connection destination candidate information and the reliability detected in S1020) in S1005. This can be done by multiplying the estimated band. *
- the terminal device 2 determines that another access point having a higher bandwidth than the access point to be selected (connection destination selection in S1006). (ST106), and when such other access points exist (No), return to ST102 again and perform the same process as described above for another access point to be selected Execute.
- connection destination selection is made for all the access points, and the terminal device 2 determines that there is no other access point having a higher bandwidth than the access point to be selected (ST106: Yes). No access point is selected as the connection destination.
- the terminal device, the communication control device, the communication system, and the communication control method according to the present disclosure include information on past bands accumulated for access points that are candidates for connection destinations, and current band conditions for the access points.
- a terminal device that performs communication via a wireless access point, a communication control device that controls connection of the terminal device to the wireless access point, and the terminal device and the communication control device And a communication control method for determining a wireless access point to which a terminal device is connected.
Abstract
Description
図1は、本開示の第1実施形態に係る通信システム1の全体構成図である。この通信システム1は、端末装置2と、この端末装置2の無線通信を中継する基地局3およびアクセスポイント4と、電話網やインターネット等の通信ネットワーク5を介して端末装置2に接続可能な通信制御装置6とを主として備える。端末装置2は、基地局3およびアクセスポイント4を介して通信ネットワーク5に接続可能である。
ただし、
UE1_RTT (10:16):端末装置UE1が時刻10:16に測定したRTT
UE2_RTT (10:16):端末装置UE2が時刻10:16に測定したRTT
UE3_RTT (10:17):端末装置UE3が時刻10:17に測定したRTT
ただし、
α:端末装置2による瞬時値の重み係数
1-α:通信制御装置6(接続先候補情報)からの帯域データの重み係数
DB_ RTT (10:15):通信制御装置6による先週までの時刻10:15のRTT値
平均RTT (10:15):本日の時刻10:15-10:17の3分間の平均RTT値
ただし、
α:端末装置2による瞬時値の重み係数
1-α:通信制御装置6(接続先候補情報)からの帯域データの重み係数
C_RTT:係数
F_RTT:RTTから帯域を算出する関数
NowRTT:端末装置2が測定した瞬時RTT
DB_Rate:通信制御装置6(接続先候補情報)から取得した帯域データ
図9は本開示の第2実施形態に係る通信システムにおける端末装置2の機能ブロック図であり、図10は通信システムの制御シーケンス図であり、図11は周辺アクセスポイントの検出リストの一例を示す説明図である。図9および図10では、上述の図2および図6(第1実施形態)にそれぞれ示した構成要素と同様の構成要素については、同一の符号が付されている。また、第2実施形態に係る通信システムに関し、以下で特に言及しない事項については、第1実施形態の場合と同様とする。
図12は本開示の第3実施形態に係る通信システムにおける端末装置および通信制御装置の機能ブロック図であり、図13は通信システムの制御シーケンス図である。図12および図13では、上述の図2および図6(第1実施形態)にそれぞれ示した構成要素と同様の構成要素については、同一の符号が付されている。また、第3実施形態に係る通信システムに関し、以下で特に言及しない事項については、上述の第1実施形態等の場合と同様とする。
図14は本開示の第4実施形態に係る通信システムにおける端末装置2の機能ブロック図であり、図15は通信システムの制御シーケンス図であり、図16は協調制御レベルの推定リストの一例を示す説明図である。図14および図15では、上述の図2および図6(第1実施形態)にそれぞれ示した構成要素と同様の構成要素については、同一の符号が付されている。また、第4実施形態に係る通信システムに関し、以下で特に言及しない事項については、上述の第1実施形態等の場合と同様とする。
2 端末装置
3 基地局
4 アクセスポイント
5 通信ネットワーク
6 通信制御装置
10 位置情報取得部
11 送信部
12 受信部
13 通信品質測定部
14 帯域推定部
15 接続先選択部
20 受信部
21 送信部
22 情報取得部
23 データ記憶部
24 候補情報抽出部
31 周辺AP検出部
41 協調制御検出部
42 チャネル検出部
43 ノイズ検出部
Claims (13)
- 通信を制御する通信制御装置との通信に基づき、接続可能な複数の無線アクセスポイントの中から接続すべき無線アクセスポイントを選択する端末装置であって、
通信の実行位置の情報を含む端末情報を前記通信制御装置に対して送信する送信部と、
前記通信の実行位置に対応する無線アクセスポイントの候補の情報を含む接続先候補情報を前記通信制御装置から受信する受信部と、
前記接続先候補情報に含まれる各無線アクセスポイントに関する現在の帯域を推定する帯域推定部と、
前記接続先候補情報に含まれる無線アクセスポイントの候補の中から1以上の無線アクセスポイントを接続先として選択する接続先選択部と
を備え、
前記接続先候補情報には、前記無線アクセスポイントの各候補に関して取得された過去の帯域の情報が含まれ、
前記接続先選択部は、前記無線アクセスポイントの各候補に関する前記過去の帯域および前記推定された帯域に基づき、前記1以上の無線アクセスポイントを選択することを特徴とする端末装置。 - 前記帯域推定部は、RTTに基づき前記現在の帯域を推定することを特徴とする請求項1に記載の端末装置。
- 前記通信の実行位置において接続可能な周辺の無線アクセスポイントを検出する周辺アクセスポイント検出部を更に備え、
前記端末情報には、前記周辺の無線アクセスポイントに関する情報が含まれ、
前記無線アクセスポイントの候補には、前記周辺の無線アクセスポイントが含まれることを特徴とする請求項1に記載の端末装置。 - 前記周辺の無線アクセスポイントの各々に関し、協調制御の実行の有無を検出する協調制御検出部を更に備え、
前記端末情報には、前記協調制御検出部による前記協調制御に関する検出結果が含まれ、
前記接続先候補情報には、前記協調制御に関する検出結果に対応する無線アクセスポイントの候補の情報が含まれることを特徴とする請求項1に記載の端末装置。 - 前記周辺の無線アクセスポイントの各々に関し、使用するチャネルを検出するチャネル検出部を更に備え、
前記端末情報には、前記チャネル検出部による前記チャネルの検出結果が含まれ、
前記接続先候補情報には、前記チャネルの検出結果に対応する無線アクセスポイントの候補の情報が含まれることを特徴とする請求項1に記載の端末装置。 - 前記周辺の無線アクセスポイントの各々に関し、電波のノイズレベルを検出するノイズ検出部を更に備え、
前記端末情報には、前記ノイズ検出部による前記ノイズレベルの検出結果が含まれ、
前記接続先候補情報には、前記ノイズレベルの検出結果に対応する無線アクセスポイントの候補の情報が含まれることを特徴とする請求項1に記載の端末装置。 - 前記周辺アクセスポイント検出部は、前記無線アクセスポイントに関する受信信号強度を検出することを特徴とする請求項3に記載の端末装置。
- 前記送信部は、周辺の無線アクセスポイントの検出情報および前記帯域推定部によって推定された帯域の情報を前記通信制御装置に対して送信することを特徴とする請求項1に記載の端末装置。
- 通信を制御する通信制御装置との通信に基づき、接続可能な複数の無線アクセスポイントの中から接続すべき無線アクセスポイントを選択する端末装置であって、
通信の実行位置の情報を含む端末情報を前記通信制御装置に対して送信する送信部と、
前記通信の実行位置に対応する無線アクセスポイントの候補の情報を含む接続先候補情報を前記通信制御装置から受信する受信部と、
前記接続先候補情報に含まれる無線アクセスポイントに関する通信品質を測定する通信品質測定部と、
前記接続先候補情報に含まれる無線アクセスポイントの候補の中から1以上の無線アクセスポイントを接続先として選択する接続先選択部と
を備え、
前記送信部は、前記通信品質測定部によって測定された前記通信品質の情報を前記通信制御装置に対して更に送信し、
前記受信部は、前記通信品質の情報に基づき前記無線アクセスポイントに関して推定された帯域の情報を前記通信制御装置から受信し、
前記接続先選択部は、前記推定された帯域に基づき、前記1以上の無線アクセスポイントを選択することを特徴とする端末装置。 - 請求項1に係る前記端末装置に対して前記接続先候補情報を送信する通信制御装置。
- 請求項1に係る前記端末装置および請求項10に係る前記通信制御装置を備えた通信システム。
- 通信制御装置からの情報に基づき選択した無線アクセスポイントを介して通信を行う端末装置に関する通信制御方法であって、
前記通信の実行位置の情報を含む端末情報を前記通信制御装置に対して送信する送信ステップと、
前記通信の実行位置に対応する無線アクセスポイントの候補の情報を含む接続先候補情報を前記通信制御装置から受信する受信ステップと、
前記接続先候補情報に含まれる無線アクセスポイントに関する現在の帯域を推定する帯域推定ステップと、
前記接続先候補情報に含まれる無線アクセスポイントの候補の中から1以上の無線アクセスポイントを接続先として選択する接続先選択ステップと
を含み、
前記接続先候補情報には、前記無線アクセスポイントの候補に関して取得された過去の帯域の情報が含まれ、
前記接続先選択ステップでは、前記無線アクセスポイントの候補に関して取得された過去の帯域および前記推定された帯域に基づき、前記1以上の無線アクセスポイントが選択されることを特徴とする通信制御方法。 - 通信制御装置からの制御情報に基づき選択した無線アクセスポイントを介して通信を行う端末装置に関する通信制御方法であって、
前記通信の実行位置の情報を含む端末情報を前記通信制御装置に対して送信する端末情報送信ステップと、
前記通信の実行位置に対応する無線アクセスポイントの候補の情報を含む接続先候補情報を前記通信制御装置から受信する候補情報受信ステップと、
前記接続先候補情報に含まれる無線アクセスポイントに関する通信品質を測定する通信品質測定ステップと、
前記接続先候補情報に含まれる無線アクセスポイントの候補の中から1以上の無線アクセスポイントを接続先として選択する接続先選択ステップと、
前記通信品質測定ステップによって測定された前記通信品質の情報を前記通信制御装置に対して送信する通信品質情報送信ステップと、
前記通信品質の情報に基づき前記無線アクセスポイントに関して推定された帯域の情報を前記通信制御装置から受信する帯域情報受信ステップと
を含み、
前記接続先選択ステップでは、前記推定された帯域に基づき、前記1以上の無線アクセスポイントが選択されることを特徴とする通信制御方法。
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WO2020202374A1 (ja) * | 2019-03-29 | 2020-10-08 | 本田技研工業株式会社 | 通信装置、通信方法、及びプログラム |
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JP2008118722A (ja) * | 2008-01-28 | 2008-05-22 | Kyocera Corp | 通信手段変更方法およびそれを利用した端末装置 |
JP2015109509A (ja) * | 2013-12-03 | 2015-06-11 | 国立大学法人東北大学 | 無線通信システムおよび無線通信方法 |
JP2015186074A (ja) * | 2014-03-25 | 2015-10-22 | 日本電信電話株式会社 | 無線ネットワーク構築装置、無線ネットワークシステム、および、無線ネットワーク構築方法 |
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JP6114813B1 (ja) | 2017-04-12 |
US10470119B2 (en) | 2019-11-05 |
GB2561088A (en) | 2018-10-03 |
JP2017120994A (ja) | 2017-07-06 |
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