JP2017046112A - Radio terminal, radio communication system, controller, and base station selection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio terminal capable of ensuring stable communication quality by performing communication via a most reliable radio system depending on the communication circumstances.SOLUTION: The radio terminal capable of using a plurality of radio systems comprises a control unit that selects a base station corresponding to a radio system used for communication on the basis of a piece of information on previous communication result relevant to the position of the radio terminals.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless terminal, a wireless communication system, a control device, and a base station selection method.

In recent years, in the field of wireless networks, as a mobile phone system, for example, Long Term Evolution (LTE) standardized by 3rd Generation Partnership Project (3GPP)
Is used. On the other hand, wireless local area networks (WLANs) are mainly used in homes, commercial facilities, and public transportation. In addition, wireless terminals having functions of both a mobile phone terminal and a wireless LAN terminal, such as smartphones, are widespread.

In order to cope with the rapid increase in traffic in recent years, various countermeasures have been studied in wireless networks. It is considered that one of the leading methods is to use a plurality of radio access technologies (Radio Access Technology: RAT) such as LTE and WLAN in combination depending on the situation. For the purpose of offloading, a method of using LTE and WLAN in combination is being studied in 3GPP and the like. Wireless LAN access points are cheaper than LTE base stations and can be installed more easily than LTE base stations, so it is expected that they will be added more actively in areas where congestion is expected. .

JP 2004-88592 A Japanese Patent Laid-Open No. 2004-120080 Special table 2007-508720 JP 2008-113073 A JP 2009-130754 A JP 2010-81118 A

  In the mobile phone system, in the service area, the base station is based on a strict area design so that the specified reliability can be ensured regardless of the time and location in terms of the connectivity and communication quality of mobile phone terminals. Is installed. On the other hand, in the wireless LAN system, a base station (access point) is not strictly installed as compared with the mobile phone system. For example, since there are many users at a station platform during a rush hour, a situation may occur in which communication is not possible or communication speed is slow even if a wireless terminal can connect to a wireless LAN access point. Thus, in the wireless LAN system, the communication quality varies depending on the communication environment, and it is difficult to say that the same reliability as that of the mobile phone system is guaranteed.

  Therefore, at present, even if the user of the mobile phone terminal tries to use the mobile phone system and the wireless LAN system in combination, the communication quality may vary depending on the communication environment.

  An object of this invention is to provide the technique which can ensure the stable communication quality, when a radio | wireless terminal communicates by the optimal radio system according to a communication environment.

  One aspect of the present invention is a wireless terminal that can use a plurality of wireless systems. The wireless terminal includes a control unit that selects a base station corresponding to a wireless system used for communication based on at least past communication performance information related to the position of the wireless terminal.

  ADVANTAGE OF THE INVENTION According to this invention, stable communication quality can be ensured because a radio | wireless terminal communicates with the optimal reliable radio system according to a communication environment.

FIG. 1 shows a configuration example of a wireless communication system according to the embodiment. FIG. 2 shows a hardware configuration example of the wireless terminal. FIG. 3 shows a hardware configuration example of the control device. FIG. 4 is a flowchart showing processing in the first embodiment of the network system (wireless communication system) shown in FIG. FIG. 5 shows an example of the data structure of past communication performance information. FIG. 6 is an explanatory diagram of an operation example of the second embodiment. FIG. 7 is a diagram schematically illustrating functions of a terminal according to the second embodiment. FIG. 8 is a flowchart illustrating a processing example of a terminal (a CPU thereof) according to the second embodiment. FIG. 9 is an explanatory diagram of an operation example of the third embodiment. FIG. 10 is a flowchart illustrating a processing example of the wireless terminal (CPU thereof) according to the third embodiment. FIG. 11 is an explanatory diagram of an operation example of the fourth embodiment. FIG. 12 schematically illustrates functions of the control device according to the fourth embodiment. FIG. 13 is a flowchart illustrating a processing example of the control device (CPU) in the fourth embodiment. FIG. 14 is an explanatory diagram of an operation example of the fifth embodiment. FIG. 15 schematically illustrates functions of a wireless terminal according to the fifth embodiment. FIG. 16 schematically illustrates functions of the control device according to the fifth embodiment. FIG. 17 is a flowchart illustrating a processing example of a control device (CPU) in the fifth embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. The configuration of the embodiment is an exemplification, and is not limited to the configuration of the embodiment.

  In the embodiment, a wireless terminal capable of using a plurality of wireless systems will be described. The wireless terminal includes a control unit that selects a base station corresponding to a wireless system used for communication based on at least past communication performance information related to the position of the wireless terminal.

The plurality of radio systems include, for example, a plurality of radio access systems (RAT). RAT includes wireless communication standards such as LTE, Wideband Code Division Multiple Access (W-CDMA) and Global System for Mobile communications (GSM). In addition, RAT
Can include WLAN (IEEE802.11 series), WiMAX, Bluetooth (IEEE802.15.1), and the like.

“At least related to the position of the wireless terminal” means related to the position of the wireless terminal. Therefore, the “past communication performance information” may be information corresponding to the position of the wireless terminal or information corresponding to the position and time of the wireless terminal, for example. Further, the identification information of the base station acquired at the position may be used instead of the “position”. The identification information of the base station is, for example, an E-UTRAN Cell Global ID (ECGI) assigned to the eNB 3 or a physical cell I
D (Physical Cell ID: PCI), Basic Service Set Identifier (BSSID) of the AP 5 of the WLAN, and the like. Further, as the “position”, for example, the current position or time of the wireless terminal is used. However, a position or time other than the current position or current time may be used.

  “Past communication performance information” may be communication performance information of a wireless terminal, or may be communication performance information of a wireless terminal other than a wireless terminal. The “past communication performance information” may be communication performance information for at least one of the plurality of wireless systems, and it is not necessary to acquire the communication performance information for all of the plurality of wireless systems.

“Base station” means base station of mobile phone system, WLAN access point, Bluetooth
Including base stations. “Selecting a base station corresponding to a wireless system used for communication” includes, for example, selecting a base station of a certain wireless system when there is past communication record information related to the certain wireless system. Alternatively, “select a base station corresponding to a wireless system to be used for communication” is to select a base station of a wireless system other than a certain wireless system when there is no past communication record information related to the certain wireless system. Including. The “control unit” may be realized by a processor (CPU or the like) and a memory, or may be realized by hardware such as an integrated circuit.

[Network system (wireless communication system)]
FIG. 1 shows a configuration example of a network system (wireless communication system) according to the embodiment. In FIG. 1, in the network system, an LTE network and a wireless LAN (WLAN) network are connected to the Internet 1. The LTE network includes a base station (eNB) 3 that is in radio communication with a radio terminal (mobile station) 2 and a core network (CN) 4 to which the eNB 3 is connected, and the CN 3 is connected to the Internet 1. The WLAN includes an access point (AP) 5 capable of wireless communication with a wireless terminal 2 (hereinafter referred to as “terminal 2”), and the AP 5 is connected to the Internet 1.

  Connected to the Internet 1 is a content server 6 (hereinafter “server 6”) through which a terminal 2 communicates via the LTE network or WLAN. The server 6 is an example of a communication partner of the terminal 2.

  In addition, the network system can include a control device 7 that controls which of the LTE network and the WLAN is used for communication between the server 6 and the terminal 2. However, the control device 7 is not an essential configuration. In the example of FIG. 1, the control device 7 is connected to the Internet 1. The control device 7 has a function of relaying data transmitted from the server 6 to the terminal 2, and controls whether data is transmitted via a link via the LTE network or a link via the WLAN (referred to as link control). )I do. The control device 7 is an example of “a selection device that selects a base station corresponding to a wireless method used by the wireless terminal from a plurality of wireless methods that can be used by the wireless terminal and notifies the wireless terminal of a selection result”. .

  The network system can include a database (DB) 8 in which past communication performance information using the AP 5 is stored. However, DB8 is not an essential configuration. In the example of FIG. 1, the control device 7 is connected to a database (DB) 8 in which past communication performance information using the AP 5 is stored.

The terminal 2 is an example of a wireless terminal that can use a plurality of wireless access methods (RAT, hereinafter referred to as “wireless method”). In the example of FIG. 1, the terminal 2 can use LTE and WLAN (IEEE802.11 series) as a plurality of wireless systems. However, RAT is LTE and W
It is not limited to LAN.

  The terminal 2 can select a base station used for communication from a plurality of wireless systems. In the example of FIG. 1, the eNB 3 and the AP 5 are examples of “base stations”. The terminal 2 which concerns on embodiment selects the base station (one of eNB3 and AP5) used for communication based on the past communication performance information which concerns on the position of the terminal 2 at least. As shown in FIG. 1, when a plurality of APs 5 (AP 5a, AP 5b) can be used, the terminal 2 can select a base station to be used for communication from the eNB 3, AP 5a, AP 5b.

FIG. 2 shows a hardware configuration example of the terminal 2. In FIG. 2, the terminal 2 includes a central processing unit (CPU) 21, a random access memory (RAM) 22 connected to the CPU 21 via a bus, a read only memory (ROM) 23, and a memory (storage device) 24. Including. The CPU 21 is connected to a radio frequency (RF) circuit 25 for WLAN and an RF circuit 26 for LTE. Each of the RF circuit 25 and the RF circuit 26 is connected to a corresponding transmission / reception antenna 25A, 26A.

  The RAM 22 is used as a work area for the CPU 21, a data storage area, and a communication data buffer area. The ROM 23 stores a program executed by the CPU 21 and data used when the program is executed. The memory 24 is used as a storage area for programs and data. As the memory 24, for example, a hard disk drive (HDD), a solid state drive (SSD), a flash memory, an electrically erasable programmable read-only memory (EEPROM), or the like can be applied. The memory 24 stores “past communication performance information” obtained by the terminal 2.

Each of the RF circuit 25 and the RF circuit 26 performs conversion processing between a baseband signal (BB signal) and a radio signal. A radio signal received by the transmitting / receiving antenna 25A (26A) is converted into a BB signal by the corresponding RF circuit 25 (26) and input to the CPU 21. The BB signal from the CPU 21 is converted into a radio signal by the RF circuit 25 (26) and transmitted from the transmission / reception antenna 25A (26A). Processing of the BB signal can also be performed using a digital signal processor (DSP) or a field programmable gate array (FPGA). RF circuit 2
5 and the transmitting / receiving antenna 25A are referred to as “WLAN modules”, and the RF circuit 26 and the transmitting / receiving antenna 26A are referred to as “LTE modules”.

  The CPU 21 controls the operation of the terminal 2 by loading the program stored in the ROM 23 into the RAM 22 and executing it. That is, the CPU 21 operates as a control unit of the terminal 2 and selects a base station to be used for communication based on past communication performance information related to the position of the terminal 2. The CPU 21 is an example of a “control unit”.

  FIG. 3 shows a hardware configuration example of the control device 7. In FIG. 3, the control device 7 includes a CPU 71, a RAM 72, a ROM 73, a memory 74, and a network interface (NW I / F) 75.

  The CPU 71 loads the program stored in the ROM 73 into the RAM 72 and executes it, thereby operating as a control unit and performing predetermined processing. For example, the CPU 71 performs processing of acquiring past communication performance information stored in the DB 8 and transferring it to the terminal 2 in response to a request from the terminal 2. Alternatively, the CPU 71 determines a wireless method to be used by the terminal 2 based on past communication performance information stored in the DB 8 and prompts the terminal 2 to connect to the determined wireless method base station. The CPU 71 selects “a base station corresponding to a wireless method used for communication by the wireless terminal based on past communication performance information related to the position of the wireless terminal, and transmits information indicating the selected base station to the wireless terminal. It is an example of a "control part to perform."

  The DB 8 is stored in the memory 74, for example. But DB8 may be memorize | stored in the database server (not shown) connected with the control apparatus 7, and the control apparatus 7 may be accessible. The control device 7 (CPU 71) stores the communication result information received from the terminal 2 in the DB 8 in response to the communication request information storage request from the terminal 2.

  The NW I / F 75 performs processing such as exchange between data and packets handled by the CPU 71. The packet has a format that can be transmitted and received between the control device 7 and the base station (eNB 3 or AP 5).

Embodiment 1
As a first embodiment, a description will be given of a mode in which in a network system as shown in FIG. 1, whether or not WLAN is used is determined based on past communication performance information at the current position and time of the terminal 2.

  FIG. 4 is a flowchart showing processing in the first embodiment of the network system shown in FIG. 4 may be the terminal 2 or the control device 7 that communicates with the terminal 2. In the following description, a case where the execution subject is the terminal 2 will be described as an example. When the terminal 2 is the execution subject, each process illustrated in FIG. 4 is performed by the CPU 21 of the terminal 2. When the control device 7 is the execution subject, each process shown in FIG. 4 is performed by the CPU 71 of the control device 7.

  In 01, the CPU 21 of the terminal 2 totals the communication performance of the terminal 2. “Communication record” is set as “communication record” when the terminal 2 can actually transmit data via the AP 5. Therefore, for example, even when the wireless quality between the terminal 2 and the AP 5 is good and a wireless link can be established between the two, if data transmission cannot be performed due to congestion of the wired network, “communication” No results ”.

  The “communication performance” can be recorded and tabulated as follows, for example. When the terminal 2 receives the radio wave from the AP 5 and the BSSID of the AP 5 included in the radio wave is the BSSID of the AP that can be used by the terminal 2, the terminal 2 performs a connection process with the AP 5. When the connection with the AP 5 is completed due to the establishment of the wireless link, the terminal 2 determines whether or not the data can be transmitted within a predetermined time after the connection is completed. The terminal 2 determines “communication success” when the data can be transmitted, and determines “communication failure” when the data cannot be transmitted. The terminal 2 stores the determination result in the memory 24 as “past communication performance information”.

  Note that the memory 24 may store communication performance information of wireless terminals other than the terminal 2 as “past communication performance information”. In this case, it is possible to determine whether to use the WLAN even when there is no communication record of the terminal itself.

  The terminal 2 may connect to the LTE network when communication fails. In addition, when the communication is successful, the terminal 2 may continue the communication using the WLAN or may terminate (disconnect) the communication.

  FIG. 5 shows an example of the data structure of past communication performance information. As shown in FIG. 5, the past communication performance information can be stored in a table format. The table is formed of one or more records in which the time (time), position, and the number of successes and failures of communication corresponding to the BSSID are stored. The past communication result information as shown in FIG. 5 is stored in at least one of the memory 24 and the DB 8.

  As the time (time) and time, for example, the position and time when the connection between the terminal 2 and the AP 5 is completed are stored. The position and time when the connection between the terminal 2 and the AP 5 is completed is an example of “current position and time”. However, the time at completion, the time before and after, and the position at the time may be treated as the current position and time.

The position is, for example, a position coordinate of the terminal 2. The position coordinates are measured using, for example, Global Positioning System (GPS). BSSID is the BS of AP5 connected to terminal 2.
Indicates the SID. The number of successes is incremented when data transmission within a certain period of time has succeeded since the connection with the AP 5 was completed. The number of failures is incremented when data transmission within a certain time from the completion of connection with the AP 5 fails.

  The time, position, and BSSID stored in the table are used as an index for searching for the corresponding number of successes and failures. However, storing both the position and the BSSID is not an essential requirement, and either one may be stored. In addition, the storage of time is not always essential. In the example of FIG. 5, an example in which the number of successes and the number of failures is stored is shown, but a flag (one of two values) indicating the success or failure of data transmission may be used.

  The trigger for updating the communication performance information (table) is, for example, when the terminal 2 discovers the AP 5. The communication performance information stored in the table may be reset periodically or when the number of records reaches a certain value. This is to consider the possibility that the environment related to the AP 5 changes, such as when another AP 5 is newly installed around a certain AP 5. Alternatively, an expiration date may be set for each record stored in the table, and records that have passed the expiration date may be deleted.

  The processes 02 to 05 shown in FIG. 3 are executed, for example, while the terminal 2 is connected to the LTE network. However, it may be executed in a state where the terminal 2 is not connected to the LTE network. When the processes of 02 to 05 are executed without being connected to the LTE network, past communication result information stored in the memory 24 is used. When the processes of 02 to 05 are executed while connected to the LTE network, the terminal 2 is one of the past communication record information stored in the memory 24 and the past communication record information stored in the DB 8. One can be used. In the following description of the first embodiment, an example in which past communication record information stored in the memory 24 is used will be described.

  In 02, the terminal 2 determines whether there is a connectable WLAN. That is, the terminal 2 determines whether or not there is a WLAN AP 5 that can receive radio waves and is permitted to use the terminal 2. If AP5 exists (02, YES), the process proceeds to 03. If AP5 does not exist, (02, NO) processing proceeds to 06.

  In 03, the terminal 2 determines whether there is past communication record information with the AP 5 whose existence has been confirmed in 02. This determination can be made, for example, by determining whether or not a record including the BSSID received by the terminal 2 from the AP 5 is stored in the past communication performance information table. If past communication record information exists (03, YES), the process proceeds to 04. If there is no past communication record information (03, NO), the process proceeds to 05.

  In 04, the terminal 2 determines whether there is past communication performance information in the current position and time of the terminal 2. That is, the terminal 2 refers to a record of past communication performance information corresponding to the current position and time. At this time, if the number of successes is greater than the number of failures (04, YES), the process proceeds to 05 assuming that there is a communication record. If the number of successes is less than or equal to the number of failures (04, NO), the process proceeds to 06 assuming that there is no communication record.

  As described above, the CPU 21 (control unit) selects a base station corresponding to a wireless method in which the number of successful communication of the wireless terminal is greater than the number of failed communication among the plurality of wireless methods in the past communication performance information. select.

  Note that the determination process 04 may be executed simply by determining whether there is communication performance information indicating the success of past communication corresponding to the current position and time (stored). That is, the CPU 21 (control unit) may select a base station corresponding to a wireless method with the past communication performance information indicating that communication was successful among a plurality of wireless methods. In this case, the communication performance information may be information (flag) indicating success or failure of communication.

  In 05, the terminal 2 connects to the WLAN AP 5 (base station). That is, the terminal 2 selects the WLAN AP 5 as a base station corresponding to a wireless method for use in communication. In the determination process of 04, when a plurality of corresponding records are detected from the table, the wireless method used by AP5 corresponding to the record with the higher success count (BSSID is stored) used for communication. Is selected as a base station corresponding to.

  If no record of AP5 corresponding to the table is stored in the process of 03, the terminal 2 connects to the AP5 in 05 and completes data transmission within a certain time from the completion of connection. It is determined whether or not it has been completed. Based on the determination result, a record of communication performance information corresponding to the AP 5 is added to the table (memory 24).

  In 06, the terminal 2 performs connection with the eNB 3 of LTE. Selection of eNB3 (cell) is performed according to the cell selection method preset in the terminal 2, for example. For example, the terminal 2 selects the eNB 3 having the strongest received radio wave intensity among the eNBs 3 that have received the radio wave, and connects to the eNB 3.

  In this way, when there is past communication record information corresponding to the current position and time of the terminal 2, the terminal 2 selects a WLAN base station (AP5) and performs communication using the WLAN. Accordingly, the terminal 2 can perform communication using the WLAN at a position and time with a track record of successful data transmission within a certain time after the connection is completed. For this reason, it is possible to perform communication using a reliable WLAN.

  On the other hand, when there is no past actual communication information, the terminal 2 selects the LTE base station (eNB 3) without using the WLAN and performs communication using the LTE network. In the LTE network, base stations are more systematically installed than WLAN, and therefore, more reliable communication than WLAN can be performed. That is, the terminal 2 can perform communication using a reliable LTE network.

  When the execution subject of the processes 01 to 05 is the control device 7, the process 01 is a process in which the control device 7 stores the communication performance information received from the terminal 2 in the DB 8. The control device 7 can store communication result information from the plurality of terminals 2 in the DB 8. In this case, the communication performance information may be managed for each terminal 2 or may be managed centrally among a plurality of terminals. The communication performance information is managed for each predetermined area and for a predetermined time unit.

  The process of 02 is performed by the terminal 2, and when there is a connectable WLAN (AP5), the control device 7 indicates that the BSSID of the AP5, the current position and time, and the ID having the BSSID can be used. Send to. The control device 7 performs the processes 03 and 04 using the information received from the terminal 2 and the information stored in the DB 8. The determination results 03 and 04 are notified from the control device 7 to the terminal 2, and the terminal 2 performs the process 05 or 06. If the BSSID is not stored in the table, the process of 03 is omitted.

  According to the first embodiment, the terminal 2 which is a wireless terminal communicates from among a plurality of wireless systems (LTE, WLAN) based on past communication performance information (related to the position of the wireless terminal) at the current position and time. The base station (eNB3, AP5) corresponding to the radio system used for the is selected. As a result, for WLANs that are considered to be less reliable than LTE, AP5 (WLAN) is selected if there is past communication performance information at the current location and time of terminal 2, and eNB3 (LTE) otherwise. Is selected. Therefore, the terminal 2 (wireless terminal) can communicate with a reliable wireless system (LTE, WLAN). In this way, stable communication quality can be ensured by the wireless terminal performing communication with the most reliable wireless method according to the communication environment.

  Hereinafter, in the second and subsequent embodiments, a base station selection method using the configuration according to the network system illustrated in FIGS. 1 to 3 will be described. Since the second and subsequent embodiments have the same configuration as that of the first embodiment, differences will be mainly described, and description of common points will be omitted. In the following description, as an example, information of the contents shown in FIG. 5 is stored as communication performance information, and a base station is selected based on past communication performance information corresponding to the current position and time of the terminal 2. An example will be described.

[Embodiment 2]
In the second embodiment, a case is assumed in which use of the WLAN is determined at a place (position) that the user of the terminal 2 frequently uses, such as commuting or attending school. FIG. 6 is an explanatory diagram of an operation example of the second embodiment.

As shown in FIG. 6, the terminal 2 performs the following operations.
(1) The current position of the terminal 2 (or the BBSID of the AP 5) and information on past communication performance in time are read from the memory 24.
(2) The terminal 2 determines which link of LTE or WLAN is used based on the record information.
(3) If it is determined that the WLAN link is to be used based on the record information, the terminal 2 connects to the WLAN base station (AP5) and communicates with the content server 6, for example. In this case, the terminal 2 disconnects the link of the unused radio system (LTE). Conversely, if it is determined that the LTE link is to be used, it is disconnected from the WLAN, connected to the LTE base station (eNB 3), and communicated with the content server 6.

  Information on past communication results may be acquired by the terminal 2 from the DB 8. The DB 8 collectively manages communication performance information for each of a plurality of wireless terminals including the terminal 2. That is, the DB 8 can store past communication performance information of the terminal 2 (wireless terminal), and can also store past communication performance information obtained by a wireless terminal other than the terminal 2 (wireless terminal). it can.

  The terminal 2 communicates with a DB8 management device (for example, the control device 7 or a database server (DB server) other than the control device 7) via the LTE line. Thereby, the past communication performance information of terminal 2 (own terminal) (an example of the past communication performance information of the wireless terminal) can be stored or acquired in DB8.

  The communication between the terminal 2 and the management apparatus may be application layer communication. Or you may transmit the information using the signaling of a radio | wireless layer (for example, RRC) between the terminal 2 and eNB. In this case, the eNB 3 communicates with the management device, stores the communication performance information in the DB 8, or acquires the communication performance information in the DB 8 from the management device and transmits it to the terminal 2. In the following description, an example in which the terminal 2 acquires information stored in the DB 8 through communication with the control device 7 that is a management device of the DB 8 will be described as an example.

  FIG. 7 is a diagram schematically illustrating functions of the terminal 2 according to the second embodiment. The terminal 2 has the hardware configuration shown in FIG. When the CPU 21 executes the program, the terminal 2 operates as an apparatus including the following. That is, the terminal 2 includes a time information acquisition unit 201, a position information acquisition unit 202, a communication performance storage unit 203, an application processing unit 204, a communication method selection unit 205, a WLAN transmission / reception unit 206, and an LTE transmission / reception unit 207. With.

The time information acquisition unit 201 acquires time information, for example, the current time, from a clock (not shown) included in the terminal 2. The position information acquisition unit 202 acquires the position coordinate data of the terminal 2 obtained using, for example, a Global Positioning System (GPS) receiver (not shown) included in the terminal 2. The position information acquisition unit 202 may acquire the BSSID of the AP 5 received by the WLAN transmission / reception unit 206 instead of the position coordinate data.

  The communication performance storage unit 203 reads past communication performance information corresponding to the time information (current time) from the time information acquisition unit 201 and the position information (current position) from the position information acquisition unit 202 from the memory 24. To the application processing unit 204.

  The application processing unit 204 supplies communication result information corresponding to the time information and the position information to the communication method selection unit 205. The communication method selection unit 205 selects a base station corresponding to the wireless method used for communication based on the communication performance information. The communication method selection unit 205 instructs one of the WLAN transmission / reception unit 206 and the LTE transmission / reception unit 207 corresponding to the selected base station to connect to the selected base station.

  The time information acquisition unit 201, the position information acquisition unit 202, the communication performance storage unit 203, the application processing unit 204, and the communication method selection unit 205 are, for example, functions of the CPU 21 realized by the CPU 21 executing a program.

  The WLAN transceiver 206 corresponds to the WLAN wireless module (RF circuit 25 and transceiver antenna 25A) shown in FIG. The LTE transmission / reception unit 207 corresponds to the LTE wireless module (RF circuit 26 and transmission / reception antenna 26A) illustrated in FIG. Each of the WLAN transmission / reception unit 206 and the LTE transmission / reception unit 207 performs connection processing and disconnection processing with the corresponding base station in accordance with an instruction from the communication method selection unit 205.

  FIG. 8 is a flowchart illustrating a processing example of the terminal 2 (the CPU 21) in the second embodiment. In 21 in FIG. 8, the terminal 2 determines whether there is data to be transmitted (transmission data). If there is transmission data (21, YES), the process proceeds to 22. If there is no transmission data (21, NO), the processing in FIG. 8 ends.

  In 22, the terminal 2 reads past communication performance information from the memory 24, for example. Alternatively, the terminal 2 inquires of the control device 7 about past communication performance information. By one of these, the terminal 2 acquires communication performance information.

  23, the terminal 2 determines whether there is a connectable WLAN AP 5. For example, if there is an AP 5 to which the terminal 2 can be connected (use of the terminal 2 is permitted) (23, YES), the process proceeds to 24. If there is no AP 5 to which the terminal 2 can be connected (23, NO), the process proceeds to 27.

  In 24, the terminal 2 determines whether or not there is past communication performance information for the AP 5 specified in 23. If there is past communication result information (24, YES), the process proceeds to 25. If there is no past communication record information (24, NO), the process proceeds to 27.

  In 25, the terminal 2 determines whether there is past communication performance information corresponding to the current position and time of the terminal 2 for the AP 5 identified in the process of 23. If there is past communication record information corresponding to the current position and time (25, YES), the process proceeds to 26. If there is no past communication record information corresponding to the current position and time (25, NO), the process proceeds to 27.

  The process 26 is the same as the process 05 in FIG. 4, and the process 27 is the same as the process 06 in FIG. When there is past communication performance information corresponding to the current position and time of the terminal 2 by the processing of 26 and 27, the terminal 2 selects a WLAN base station (AP5) and performs communication using the WLAN. Do. Accordingly, the terminal 2 can perform communication using the WLAN at a position and time with a track record of successful data transmission within a certain time after the connection is completed. For this reason, it is possible to perform communication using a reliable WLAN. On the other hand, when there is no past actual communication information, the terminal 2 selects the LTE base station (eNB 3) without using the WLAN and performs communication using the LTE network. As described above, the second embodiment can obtain the same effects as those of the first embodiment.

[Embodiment 3]
Next, Embodiment 3 will be described. In the third embodiment, a place where the user of the terminal 2 stays for a relatively long time, such as a coffee shop or a coffee shop, or a place where the user of the terminal 2 visits for the first time is assumed. That is, it is assumed that the user's terminal 2 does not hold past communication performance information or is difficult to use.

  In the third embodiment, an example in which the terminal 2 determines the use / non-use of the WLAN based on the area-by-area and time-by-hour record information stored in the network on the network 7 and the position and time of the terminal 2 in advance. explain.

FIG. 9 is an explanatory diagram of an operation example of the third embodiment. As shown in FIG. 9, the terminal 2 in Embodiment 3 performs the following operations.
(1) The terminal 2 acquires information on communication performance at the current position and time from the DB 8. That is, the terminal 2 inquires the past communication performance information at the current position and time to the control device 7 (not shown in FIG. 6), and the control device 7 reads the past communication performance information corresponding to the inquiry from the DB 8, Transmit to terminal 2.

  For this reason, in Embodiment 3, the terminal 2 is connected to the LTE network in advance, and communicates with the control device 7 via the LTE network. The DB 8 stores past communication performance information obtained by terminals other than the terminal 2. Past communication performance information can be accumulated, for example, for each area and for each time. The control device 7 acquires from the DB 8 past communication performance information that matches the position, time, area, and time obtained from the terminal 2, and transmits them to the terminal 2.

(2) The terminal 2 determines whether to use the LTE link or the WLAN link based on the communication performance information.
(3) The terminal 2 performs communication by selecting a base station based on the determination result. In the example shown in FIG. 9, the terminal 2 determines that the WLAN is used, selects the AP 5 of the WLAN, connects to the AP 5, and performs communication. In this case, the connection with the LTE network (eNB 3) is disconnected.

The function of the terminal 2 in the third embodiment is the same as that in the second embodiment (FIG. 7). However, in the third embodiment, the application processing unit 204 uses the LTE transmission / reception unit 207 for the time information (current time) from the time information acquisition unit 201 and the position information (current position) from the position information acquisition unit 202. To the control device 7. The LTE transmission / reception unit 207 receives the wireless method selection result (one of the WLAN and the LTE network) in the control device 7 and passes it to the application processing unit 204. The application processing unit 204 passes the selection result to the communication method selection unit 205. The communication method selection unit 205 controls operations of the WLAN transmission / reception unit 206 and the LTE transmission / reception unit 207 according to the selection result.

  When the selection result indicates the use of WLAN, the communication method selection unit 205 selects the AP 5 to be used for communication, and instructs the WLAN transmission / reception unit 206 to connect to the AP 5. After connection with AP5, communication (data transmission / reception) is performed. In addition, the communication method selection unit 205 instructs the LTE transmission / reception unit 207 to disconnect from the LTE network (eNB 3).

  FIG. 10 is a flowchart illustrating a processing example of the terminal 2 (the CPU 21 thereof) according to the third embodiment. The process shown in FIG. 10 is the same as the process shown in FIG. 8 except that the process of 22A is different from the process of 22 shown in FIG. In the process of 22A, the terminal 2 acquires the current position and time of the terminal 2, and inquires the control device 7 about provision of corresponding past communication performance information. Note that the address of the control device 7 is known in the terminal 2, and the control device 7 transmits past communication performance information to the terminal 2 using, for example, the address of the terminal 2 included in the inquiry from the terminal 2. be able to. The CPU 21 of the terminal 2 can receive past communication performance information from the control device 7. As described above, the CPU 21 (an example of a control unit) of the terminal 2 (an example of a wireless terminal) receives past communication performance information using LTE (an example of a plurality of wireless systems).

  Except for the processing of 22A, the processing in the terminal 2 is the same as that in the second embodiment, and thus the description thereof is omitted. By the processing shown in FIG. 10, the terminal 2 uses the WLAN or LTE based on the past communication performance information obtained by terminals other than the terminal 2 stored in the DB 8 (base station used for communication). To select AP5 or eNB). That is, the same effect as that of the second embodiment can be obtained.

[Embodiment 4]
In the fourth embodiment, an example in which the control device 7 is arranged on the network side and the control device 7 determines whether or not to use the WLAN based on an instruction from the terminal 2 will be described. FIG. 11 is an explanatory diagram of an operation example of the fourth embodiment.

  The control device 7 determines which of the LTE network link and the WLAN link is used for communication between the terminal 2 and the server 6. In the fourth embodiment, the terminal 2 and the control device 7 operate as follows.

(1) When the WLAN AP 5 is discovered, the terminal 2 communicating with the server 6 using the LTE network (eNB 3) reads past communication performance information corresponding to the current position and time from the memory 24. The AP 5 is an example of a “selection candidate base station”.
(2) The terminal 2 transmits the current position (an example of “information related to the position of the wireless terminal”) and the corresponding past communication performance information to the control device 7 via the LTE network. At this time, the information sent to the control device 7 includes the address information (IP address) of the AP 5. The terminal 2 can obtain the address information of the AP 5 from the broadcast information of the AP 5, for example. Note that the address information may be obtained from other than the broadcast information. Further, the information sent to the control device 7 may include the BSSID of the AP 5.

(3) The control device 7 uses the address information of the AP 5 received from the terminal 2 to obtain information indicating the degree of congestion of the AP 5 (the number of connected terminals per unit time). That is, the control device 7 communicates with the AP 5 using the address information and receives information indicating the degree of congestion.

In the information indicating the degree of congestion, when the number of connected terminals is equal to or less than a threshold value prepared in advance by the control device 7, the control device 7 determines the use (selection) of the AP 5. On the other hand, when the number of connected terminals exceeds the threshold value, the control device 7 determines to continue using the LTE network (selection of the eNB 3).

  The control device 7 sends the determination result (determination result) to the terminal 2, that is, if the control device 7 determines that the AP 5 is used, the control device 7 sends a message indicating the connection to the AP 5 to the terminal 2 via the LTE network. . As a result, the terminal 2 connects to the AP 5 and performs disconnection processing from the LTE network. The control device 7 relays data (packets) transmitted and received between the terminal 2 and the server 6, and relays data sent from the server 6 to the terminal 2 to the AP 5 of the WLAN.

  On the other hand, if it is determined that the AP 5 is not used, the control device 7 sends a message indicating that the AP 5 is not used to the terminal 2 via the LTE network. As a result, communication between the terminal 2 and the server 6 via the LTE network is continued, and the control device 7 relays data to be relayed from the server 6 to the terminal 2 to the LTE network (eNB 3). The consideration of the degree of congestion is an option and is not an essential configuration.

  In the operation example of the fourth embodiment, the terminal 2 may send current position information and past communication performance information, and the time information may be acquired by the control device 7. Further, the terminal 2 may send position or position and time information to the control device 7, and the control device 7 may acquire past communication performance information corresponding to the position or position and time from the DB 8.

  In the fourth embodiment, the terminal 2 has the hardware configuration shown in FIG. 2 and the function shown in FIG. Therefore, these descriptions are omitted. On the other hand, the control device 7 has the hardware configuration shown in FIG. FIG. 12 schematically shows the function of the control device 7. In FIG. 12, the control device 7 includes a time information acquisition unit 301, a communication performance storage unit 302, and a communication method selection unit 303.

  The time information acquisition unit 301 acquires time from a clock (not shown) provided in the control device 7. The communication performance storage unit 302 receives and stores the position from the terminal 2 and the communication performance information. The communication performance storage unit 302 obtains the time acquired by the time information acquisition unit 301. The communication method selection unit 303 determines whether the AP 5 is used or not based on past communication performance information corresponding to the position and time and the degree of congestion of the corresponding AP 5. Then, the communication method selection unit 303 transmits the data from the server 6 (an example of application data from the host network) to the link on the selected side (LTE and WLAN). The time information acquisition unit 301, the communication performance storage unit 302, and the communication method selection unit 303 are functions of the CPU 71 realized by the CPU 71 executing a program.

  FIG. 13 is a flowchart illustrating a processing example of the control device 7 (the CPU 71) in the fourth embodiment. In 41 of FIG. 13, the control device 7 determines whether there is data (transmission data) to be relayed from the server 6 to the terminal 2. If there is transmission data (41, YES), the process proceeds to 42. If there is no transmission data (41, NO), the processing in FIG. 13 ends.

  42, the control device 7 sends a notification for prompting transmission of information (referred to as terminal-related information) such as information on the current position of the terminal 2 and past communication performance information to the terminal 2 via the LTE network. Receive. In addition to the location and communication performance information, the terminal related information also receives information indicating the WLAN (AP5) to which the terminal 2 can be connected and the address information of the AP5.

In 43, the control device 7 determines whether there is a connectable WLAN using the terminal-related information. For example, the control device 7 determines whether or not the terminal related information includes information indicating the AP 5 to which the terminal 2 can be connected. If such information is included (43, Y
ES), the process proceeds to 44, and if not (43, NO), the process proceeds to 48. In the determination of 43, the control device 7 stores area information of WLAN (a plurality of APs 5) that can be used by the terminal 2 in advance (connection is permitted), and the terminal 2 can communicate from the position information of the terminal 2 The presence / absence of an AP5 may be determined.

  In 44, the control device 7 determines whether or not the communication performance information with the AP 5 whose existence has been confirmed in 43 exists in the terminal related information from the terminal 2. If there is communication result information (44, YES), the process proceeds to 45. If there is no communication record information (44, NO), the process proceeds to 47. This is because the communication result information at the position of the terminal 2 is generated.

  In 45, the control device 7 acquires the congestion degree of the AP 5 (that is, the number of connections of the terminal to the AP 5 in unit time) using the address information in the terminal related information, and the number of connections is a predetermined value N (N is N It is determined whether it is less than (positive integer) or not (whether the number of connections is within a predetermined range). The predetermined value N is a threshold value for the number of terminals set in advance. If the number of terminals is less than N (45, YES), the process proceeds to 46. If the number of terminals is N or more (45, NO), the process proceeds to 48.

  In 46, the control device 7 determines whether there is past communication performance information corresponding to the current position and time of the terminal 2 for the AP 5 specified in the processing of 43. If there is past communication record information corresponding to the current position and time (46, YES), the process proceeds to 47. If there is no past communication record information corresponding to the current position and time (46, NO), the process proceeds to 48.

  In 47, the control device 7 transmits (notifies) the terminal 2 with an instruction to prompt the connection with the AP 5 (an example of “information indicating a base station corresponding to a wireless system used for communication”). The terminal 2 that has received the instruction connects to the AP 5 and performs a disconnection process with the LTE network (eNB 3). The control device 7 transmits data (transmission data) for the terminal 2 to the terminal 2 via the WLAN.

  In 48, the control device 7 determines to maintain the connection between the LTE network (eNB 3) and the terminal 2. At this time, the control device 7 may or may not notify the terminal 2 that the AP 5 is not used. The control device 7 transmits data (transmission data) for the terminal 2 to the terminal 2 via the LTE network. Note that, when the WLAN is not used, the terminal 2 may maintain the connection state with the WLAN or disconnect it.

  According to the fourth embodiment, the CPU 21 of the terminal 2 (an example of a “wireless terminal control unit”) uses LTE (an example of “one of a plurality of wireless systems”) to correspond to the current position and time. Past communication performance information (an example of “past communication performance information related to the position of the wireless terminal”) is transmitted to the control device 7.

  When there is data (transmission data) for the terminal 2, the control device 7 (the CPU 71 (control unit)) receives the position information from the terminal 2, the past communication result information corresponding to the position information (“the wireless terminal An example of “communication performance information relating to position” is received. The control device 7 determines that the AP 5 is used if there is a past communication record and the degree of congestion of the AP 5 to be used / not used is less than the threshold. At this time, a connection instruction with the AP 5 is transmitted to the terminal 2 and received by the terminal 2. That is, the CPU 21 of the terminal 2 receives an instruction to connect to the AP 5 (an example of “information indicating a base station corresponding to a wireless method used for communication”) using LTE.

  Therefore, the control device 7 dynamically changes (switches) the communication path between the server 6 and the terminal 2 (route via the LTE network, route via the WLAN) according to the position and time of the terminal 2. Can do. Further, when AP5 (WLAN) is selected, the degree of congestion of AP5 is taken into consideration, so that WLAN can be used with improved reliability.

  For example, the control device 7 monitors the congestion level of the AP 5 and the current position of the terminal 2, and when the current position of the terminal 2 is not changed and the congestion level becomes less than a predetermined value N, the control device 7 The communication link may be switched to the WLAN. In other words, the base station used for communication by the terminal 2 may be switched by the control device 7 in accordance with a change in the WLAN communication state during communication between the terminal 2 and the server 6.

  As described above, the fourth embodiment is the operation described in the first to third embodiments in that the base station corresponding to the wireless method used for the communication of the terminal 2 is selected based on the past communication performance information. The same effect as the effect can be obtained. Furthermore, according to the fourth embodiment, the use / non-use of the WLAN (AP5) is determined in consideration of the congestion degree of the AP5. For this reason, the terminal 2 can perform communication using the AP 5 in a state where the reliability is improved as compared with the case where there is a past communication record.

[Embodiment 5]
In the fifth embodiment, the control device 7 is arranged on the network side, and using the information from the terminal 2, it is determined whether the control device 7 selects LTE (eNB) or WLAN (AP5). However, the fifth embodiment is different from the fourth embodiment in that the communication performance information stored in the DB 8 is used for the determination, not the communication performance information received from the terminal 2.

  FIG. 14 is an explanatory diagram of an operation example of the fifth embodiment. The control device 7 determines which of the LTE network link and the WLAN link is used for communication between the terminal 2 and the server 6. In the fifth embodiment, the terminal 2 and the control device 7 operate as follows.

(1) The terminal 2 (the control unit of the wireless terminal) transmits the position information of the terminal 2 itself (an example of “information related to the position of the wireless terminal”) to the control device 7 via the LTE network (one of a plurality of wireless systems). Send). In the fifth embodiment, the terminal 2 does not transmit past communication performance information.
(2) The control device 7 acquires the past communication performance information corresponding to the position information of the terminal 2 and the time information acquired by the control device 7 from the DB 8.
(3) The control device 7 determines which of the LTE network and the WLAN is selected based on the communication performance information.
(4) The control device 7 transmits data according to the selection result. The control device 7 notifies the selection result to the terminal 2, and the terminal 2 (control unit of the wireless terminal) receives the selection result (an example of “information indicating a base station corresponding to a wireless method used for communication”). To do.

  However, in the fifth embodiment, the control device 7 may notify the position and time information to a device other than the control device 7 having the DB 8 (referred to as a DB server). In this case, the DB server determines whether to use the WLAN or the LTE network based on whether there is communication performance information corresponding to the position and time information. The DB server notifies the control device 7 of the determination result of the device, and the control device 7 transmits data through a route (one of the WLAN and the LTE network) according to the determination result. When transmitting data by WLAN, the control device 7 prompts the terminal 2 to connect to the WLAN (AP5).

  The terminal 2 in the fifth embodiment has the hardware configuration shown in FIG. FIG. 15 shows functions of the terminal 2 in the fifth embodiment. The fifth embodiment is different from the second embodiment (FIG. 7) in that the terminal 2 does not have the time information acquisition unit 201. The position information acquired by the position information acquisition unit 202 is supplied to the application processing unit 204 via the communication performance storage unit 203. The application processing unit 204 supplies terminal-related information including location information to the LTE transmission / reception unit 207, and the LTE transmission / reception unit 207 transmits the terminal-related information to the eNB 3. The terminal related information can include the BSSID of AP5 and the address information of AP5 in addition to the location information.

  The LTE transmission / reception unit 207 receives an instruction from the control device 7 and passes it to the application processing unit 204. The application processing unit 204 passes the instruction to the communication method selection unit 205. When the instruction indicates the use of WLAN (connection with AP5), the communication method selection unit 205 controls the operation of the WLAN transmission / reception unit 206 to connect with the AP5.

  The control device 7 in the fifth embodiment has the hardware configuration shown in FIG. FIG. 16 schematically illustrates functions of the control device 7 according to the fifth embodiment. The point which has the time information acquisition part 301, the communication performance memory | storage part 302, and the communication system selection part 303 is the same as Embodiment 4. FIG. However, in the fourth embodiment, the communication performance storage unit 302 acquires the communication performance information supplied from the terminal 2.

  On the other hand, in the fifth embodiment, the communication result storage unit 302 acquires the communication result information corresponding to the position information from the terminal 2 and the time information from the time information acquisition unit 301 from the DB 8. Note that the communication performance storage unit 302 of the fifth embodiment performs a process of communicating with a plurality of terminals 2, collecting (aggregating) the communication performance information of each terminal 2 and storing it in the DB 8.

  The communication method selection unit 303 selects one of the WLAN (AP 5) and the LTE network (eNB 3) based on the communication result information acquired from the DB 8, and sends the selection result to the terminal 2. The communication method selection unit 303 transmits data for the terminal 2 (data from the server 6) to a communication path (link) corresponding to the selection result.

  FIG. 17 is a flowchart illustrating a processing example of the control device 7 (the CPU 71) in the fifth embodiment. The process shown in FIG. 17 is different from that of the fourth embodiment in that the process of 42A and 42B is performed instead of the process of 42 in the process example (FIG. 13) of the fourth embodiment.

  In 42A, the control device 7 sends a notification for prompting transmission of terminal-related information including information on the current position of the terminal 2 to the terminal 2 via the LTE network. Terminal-related information including information on the location) is received.

  In 42B, the CPU 71 (control unit) of the control device 7 communicates position information from the terminal 2 and communication performance information corresponding to time information obtained in the control device 7 (past communication performance information related to the position of the wireless terminal). Is obtained from DB8. In acquiring past communication performance information, at least position information from the terminal 2 (information related to the position of the wireless terminal) is used. Since the processing after 43 is the same as that of the fourth embodiment (FIG. 13), the description thereof is omitted.

  In the fifth embodiment, as in the fourth embodiment, the control device 7 is arranged on the network side, so that the communication path (link) for transmitting data for the terminal 2 is changed to the position of the terminal 2 and the WLAN (AP5). It is possible to switch from the LTE network to the WLAN according to the communication status. That is, the fifth embodiment can obtain the same effects as those of the fourth embodiment.

  According to the terminal 2 in Embodiments 1 to 5 described above, the terminal 2 that is a wireless terminal performs communication using an optimal and reliable wireless method according to the communication environment, thereby ensuring stable communication quality. Can do. In the embodiment, the terminal 2 performs switching from the LTE network to the WLAN when a certain degree of reliability can be ensured even when switching to the WLAN. As a result, it is possible to avoid a sudden drop in the quality of communication performed using the LTE network due to switching. At this time, if the use of the WLAN is free or the use cost of the WLAN is lower than the use cost of the LTE network, the user of the terminal 2 can reduce the cost required to enjoy the communication service.

  In the first to third embodiments, the terminal 2 automatically switches to the WLAN when the AP 5 that can be used (connection is permitted) is discovered (the notification information from the AP 5 is received). Try switching. For this reason, the user of the terminal 2 can use the WLAN in a highly reliable environment without particular awareness.

  In the fourth and fifth embodiments to which the control device 7 is applied, the control device 7 monitors the communication of the terminal 2 and dynamically switches between the LTE network and the WLAN in consideration of the state of the WLAN with respect to the position of the terminal 2. Can be executed. This also makes it possible for the terminal 2 to avoid a sudden drop in quality due to switching to the WLAN, and to reduce the cost required to enjoy the communication service. The configurations of the embodiments described above can be combined as appropriate.

The embodiment described above discloses the following supplementary notes. The following supplementary notes can be combined as appropriate.
(Appendix 1) A wireless terminal capable of using a plurality of wireless systems,
A wireless terminal including a control unit that selects a base station corresponding to a wireless method used for communication based on at least past communication record information related to the position of the wireless terminal. (1)

(Additional remark 2) The memory further memorize | stored the said past communication performance information,
The wireless terminal according to supplementary note 1, wherein the control unit acquires the past communication performance information from the memory.

(Additional remark 3) The said control part is a radio | wireless terminal of Additional remark 1 which receives the said past communication performance information using one of these radio systems.

(Additional remark 4) The said control part shows the base station corresponding to the radio system used for the said communication while transmitting the communication performance information which concerns on the position of the said radio | wireless terminal using one of the said some radio systems The wireless terminal according to appendix 1, which receives information.

(Additional remark 5) The said control part transmits the information which concerns on the position of the said radio | wireless terminal using one of the said some radio | wireless systems, and the information which shows the base station corresponding to the radio | wireless system used for the said communication The wireless terminal according to Appendix 1, which receives the wireless terminal.

(Appendix 6) A wireless terminal capable of using a plurality of wireless systems;
Control for communicating with the wireless terminal and transmitting information indicating a base station corresponding to a wireless system used for communication by the wireless terminal to the wireless terminal based on at least past communication performance information related to the position of the wireless terminal Equipment,
A wireless communication system including: (2)

(Appendix 7) A control device that communicates with a wireless terminal that can use a plurality of wireless systems,
Based on at least past communication record information related to the position of the wireless terminal, the base station selects a base station corresponding to the wireless system used for communication by the wireless terminal, and transmits information indicating the selected base station to the wireless terminal. A control device including a control unit. (3)

(Additional remark 8) The said control part is a control apparatus of Additional remark 7 which receives the past communication performance information which concerns on the position of the said wireless terminal from the said wireless terminal.

(Additional remark 9) The said control part receives the information which concerns on the position of the said wireless terminal from the said wireless terminal, The past communication performance information which concerns on the position of the said wireless terminal using the information which concerns on the position of the said wireless terminal at least The control apparatus according to appendix 7, which acquires

(Additional remark 10) The said control part has the past communication performance information about a selection candidate base station, and when the number of connection of the radio | wireless terminal with respect to the said selection candidate base station is in a predetermined range, the said selection candidate The control device according to any one of appendices 7 to 9, which selects a base station. (4)

(Appendix 11) A wireless terminal capable of using a plurality of wireless systems is
A base station selection method for a wireless terminal, comprising: selecting a base station corresponding to a wireless system used for communication based on at least past communication performance information related to the position of the wireless terminal. (5)

(Additional remark 12) The control apparatus which communicates with the radio | wireless terminal which can use several radio | wireless systems,
Based on at least past communication performance information relating to the position of the wireless terminal, the base station corresponding to the wireless method used for communication by the wireless terminal is selected,
A base station selection method for a control apparatus, comprising: transmitting information indicating a selected base station to the wireless terminal. (6)

2 ... Wireless terminal (mobile station)
3 ... eNB (LTE base station)
4 ... Access point (AP: WLAN base station)
7 ... Control device 8 ... Database

Claims (6)

A wireless terminal capable of using a plurality of wireless methods,
A wireless terminal including a control unit that selects a base station corresponding to a wireless method used for communication based on at least past communication record information related to the position of the wireless terminal. A wireless terminal that can use multiple wireless systems;
Control for communicating with the wireless terminal and transmitting information indicating a base station corresponding to a wireless system used for communication by the wireless terminal to the wireless terminal based on at least past communication performance information related to the position of the wireless terminal Equipment,
A wireless communication system including: A control device that communicates with a wireless terminal capable of using a plurality of wireless systems,
Based on at least past communication record information related to the position of the wireless terminal, the base station selects a base station corresponding to the wireless system used for communication by the wireless terminal, and transmits information indicating the selected base station to the wireless terminal. A control device including a control unit. The control unit, when there is past communication performance information about the selection candidate base station, and the number of wireless terminals connected to the selection candidate base station is within a predetermined range, the selection candidate base station, The control device according to claim 3, wherein the control device is selected as a base station corresponding to a wireless method used for the communication. Wireless terminals that can use multiple wireless systems
A base station selection method for a wireless terminal, comprising: selecting a base station corresponding to a wireless system used for communication based on at least past communication performance information related to the position of the wireless terminal. A control device that communicates with a wireless terminal that can use a plurality of wireless systems,
Based on at least past communication performance information relating to the position of the wireless terminal, the base station corresponding to the wireless method used for communication by the wireless terminal is selected,
A base station selection method for a control apparatus, comprising: transmitting information indicating a selected base station to the wireless terminal.