JP2010074650A - Apparatus, method, and program for giving communication condition information, access point, and wireless terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To notify an access point and an unconnected client terminal of the number of connections of the access point as communication condition information and a throughput value of a backhole. <P>SOLUTION: In a communication condition information notification apparatus, an access point wirelessly connected to one or more wireless terminals notifies each wireless terminal of communication condition information. The apparatus includes: a wireless communication means to establish wireless communication with each wireless terminal, a connection control means to control the number of wireless terminals currently connected, a throughput value measuring means to measure a throughput value of the backhole of the access point, and a transmission reception control means to insert the number of wireless terminals connected controlled by the connection control means and the throughput values of the backhole as communication condition information into a frame to be transmitted to each unconnected wireless terminal and to cause the wireless communication means to transmit the frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a communication status information notification device, a communication status information notification method, a communication status information notification program, an access point, and a wireless terminal, for example, the number of client terminals connected to an access point of a wireless network, backhaul throughput information, The present invention can be applied to an access point and a client terminal that notify a client terminal before connection establishment.

  With the spread of wireless LAN technology in recent years, many users have realized wireless communication using client terminals in companies, homes, outdoors, etc., and users who perform wireless communication have a comfortable and comfortable environment. I strongly hope to do wireless communication.

  For example, when a client terminal exists in an environment that can be connected to a plurality of access points, the client terminal conventionally makes a connection request by selecting a beacon signal having a high received electric field strength transmitted from the access point. However, it cannot be said that the access point is necessarily in an environment where comfortable wireless communication is performed.

Patent Document 1 describes a technique related to a load distribution method of a wireless LAN access point. In Patent Document 1, when a plurality of access points are grouped into one group, when a wireless terminal is connected to or released from a certain access point, the access point sets its own number of connected terminals to another access point. The technology to notify is described. However, what is given to the client terminal is not described, and the client terminal cannot know such access point information.
JP 2004-140614 A

  As described above, when a user's client terminal exists in an environment that can connect to a plurality of access points, it is desirable to provide an access point that enables the client terminal to select an access point with a relatively high throughput. .

  The throughput of a wireless network can be affected by the number of wireless terminals connected to an access point, for example. This is because as the number of wireless terminals connected increases, the amount of traffic increases and the throughput is considered to decrease. Further, when the backhaul line of the access point is a wireless line, such as a mesh network type wireless network or a multi-hop type wireless network, it can be affected by the throughput of the backhaul line.

  However, conventionally, a client terminal has not been able to know the number of connections and throughput of access points that request connection. Further, even if there is an access point that notifies the client terminal of such access point information, it is after the connection with the client terminal, and the client terminal cannot be recognized before the connection is established.

  Therefore, when a client terminal exists in an environment that can be connected to multiple access points, it automatically connects to an access point with a low backhaul throughput and a low number of client terminals before establishing a connection with the access point. There is a need for a communication status information notification device, a communication status information notification method, a communication status information notification program, an access point, and a wireless terminal capable of notifying information to be transmitted.

  In order to solve this problem, the communication status information notification device according to the first aspect of the present invention is a communication in which an access point that is wirelessly connected to one or more wireless terminals notifies each wireless terminal of its own communication status information. A status information notification device comprising: (1) wireless communication means for wireless communication with each wireless terminal; (2) connection number management means for managing the number of connections of currently connected wireless terminals; ) A throughput value measuring means for measuring the throughput value of the backhaul of the access point; and (4) a currently connected wireless terminal managed by the connection number managing means in a frame to be transmitted to each wireless terminal before connection establishment. And a transmission / reception control means for transmitting the frame to the wireless communication means.

  The communication status information notification method of the second aspect of the present invention is a communication status information notification method in which an access point wirelessly connected to one or more wireless terminals notifies each wireless terminal of its own communication status information, The access point includes wireless communication means, connection number management means, throughput value measurement means, and transmission / reception control means, (1) a wireless communication step in which the wireless communication means wirelessly communicates with each wireless terminal; (2) A connection number management step in which the connection number management means manages the number of connections of the currently connected wireless terminal; and (3) a throughput value measurement step in which the throughput value measurement means measures the throughput value of the backhaul of the access point. And (4) the number of connections of currently connected wireless terminals managed by the connection number management means in the frame transmitted by the transmission / reception control means to each wireless terminal before connection establishment, and Insert the throughput value of Kkuhoru as communication status information, and having a transmission and reception control step of transmitting the frame to the radio communication means.

  The communication status information notification program of the third aspect of the present invention is a communication status information notification program in which an access point wirelessly connected to one or a plurality of wireless terminals notifies each wireless terminal of its own communication status information, (1) Wireless communication means for wirelessly communicating with each wireless terminal, (2) Connection number management means for managing the number of wireless terminals currently connected, (3) Backhaul of the access point (4) The number of connections of the currently connected wireless terminal managed by the connection number management means and the throughput of the backhaul in the frame to be transmitted to each wireless terminal before the connection is established A value is inserted as communication status information, and is made to function as a transmission / reception control means for transmitting the frame to the wireless communication means.

  According to a fourth aspect of the present invention, there is provided an access point wirelessly connected to one or a plurality of wireless terminals, comprising the communication status information notification device according to the first aspect of the present invention.

  A wireless terminal according to a fifth aspect of the present invention is a wireless terminal that can wirelessly connect to a plurality of access points that transmit by inserting their own communication status information into a frame to be transmitted before establishing a connection, and (1) each access point (2) Before establishing connection with each access point, from the frame received from each access point, the number of connections and back of the wireless terminal currently connected to the access point A communication status information extracting means for extracting the throughput value of the hole as communication status information; and (3) storing the connection number of the currently connected wireless terminal and the throughput value of the backhaul extracted by the communication status extracting means for each access point. And (4) the number of connected wireless terminals and the backhaul currently connected after the access point stored in the storage means From the throughput value, characterized in that it comprises a connection destination selection means for selecting a relatively small access point throughput as a connection destination.

  According to the present invention, it is possible to inform the client terminal before connection with the access point of the number of connections as the communication status information of the access point and the throughput value of the backhaul. You can choose.

(A) 1st Embodiment 1st Embodiment of the communication status information notification apparatus of this invention, a communication status information notification method, a communication status information notification program, an access point, and a radio | wireless terminal is described, referring drawings.

(A-1) Configuration of First Embodiment FIG. 2 is a configuration diagram illustrating a configuration of a wireless network according to the first embodiment. In FIG. 2, the wireless network according to the first embodiment includes a plurality of access points 1-1 and 1-2 and a client terminal 2.

  The wireless network shown in FIG. 2 is constructed, for example, in a company, at home, or outdoors. Further, the client terminal 2 is present at a place where it can be connected to the plurality of access points 1-1 and 1-2.

  The access points 1-1 and 1-2 are connected to the network via the backhaul, and are base stations of the client terminal 2 that exist within its own radio wave coverage (wireless cell). Further, the access points 1-1 and 1-2 notify the client terminal 2 before connection establishment of the number of connected client terminals and throughput information of the backhaul. Here, before connection is established, an association response for accepting a connection relationship is returned to the client terminal 2 in response to an association request given from the client terminal 2.

  FIG. 1 is an internal configuration diagram showing an internal configuration of the access points 1-1 and 1-1. In FIG. 1, access points 1-1 and 1-2 include a transmission / reception control unit 11, a NW side transmission / reception unit 12, a wireless transmission / reception unit 13, a connection number management unit 14, a throughput measurement unit 15, and a connection number management database (DB) 16. At least.

  The transmission / reception control unit 11 performs a relay process between the backhaul side and the client terminal 2. The transmission / reception control unit 11 may construct the functions as the access points 1-1 and 1-2 by loading the processing program according to this embodiment, for example, on a computer. Functionally, the transmission / reception control unit 11 includes a data conversion unit 111, an NW side control unit 112, and a radio control unit 113 as shown in FIG.

  The data conversion unit 111 performs data conversion according to a communication protocol between the backhaul side and the wireless communication side.

  The NW control unit 112 performs transmission / reception control according to the communication protocol on the backhaul side. The backhaul may be a wired line or a wireless line. In the case of a wired line, for example, the NW side control unit 112 performs transmission / reception control according to a communication protocol (for example, TCP / IP) according to Ethernet (registered trademark). For example, when communication between access points is a wireless line, such as a mesh network type wireless network or a multi-hop type wireless network, the NW control unit 112 performs transmission / reception control according to a wireless communication protocol, for example. In the first embodiment, a case where the backhaul is a wireless line will be described as an example.

  The wireless control unit 113 performs transmission / reception control according to the wireless LAN protocol, and mainly controls a MAC (Medium Access Control) layer of the wireless network. As the MAC layer control, the transmission / reception control unit 11 performs, for example, access control, client terminal authentication, connection, power management state management, and the like. Further, in the first embodiment, the wireless control unit 113 includes a frame creation unit 114 that creates a MAC frame in order to notify the client terminal 2 before connection establishment of its own throughput information.

  The frame creation unit 114 reads the connection number of the currently connected client terminal from the connection number management unit 14 and the backhaul throughput information from the throughput measurement unit 15, and these connection number of the currently connected client terminal and the backhaul information Throughput information is inserted into a MAC frame and is transmitted wirelessly to the wireless transmission / reception unit 13. As a result, the client terminal 2 before connection establishment can be provided with its own throughput information, so that the client terminal can be prompted to connect to an access point with higher throughput.

  Here, as a method of notifying the number of client terminals connected to itself and the throughput information of the backhaul, when an authentication request (Probe Request) is received from the client terminal 2, a response signal (Probe Response) is received. ), A method of inserting and replying to the number of connections of these client terminals and backhaul throughput information can be applied. At this time, the transmission / reception control unit 11 inserts the connection number of the client terminal and the backhaul throughput information into the frame control field of the MAC frame header. That is, the MAC frame format is expanded and these pieces of information are inserted into unused fields. At this time, along with the expansion of the MAC frame field, identification information (extension) indicating that it has been inserted into the number of connections of the client terminal and the backhaul throughput information may be provided.

  Also, when the access points 1-1 and 1-2 intermittently transmit beacon signals, a method of transmitting the number of connections of these client terminals and backhaul throughput information in the beacon signals and transmitting them Can be applied. In this way, the client terminal 2 is notified at the stage of receiving the beacon signal by inserting and transmitting the number of connections of its own client terminal and the backhaul throughput information to the beacon signal notifying the existence of the wireless cell. Can do.

  In the first embodiment, a case is described in which both the number of client terminal connections and backhaul throughput information are inserted into the MAC frame. However, either of these pieces of information may be inserted.

  The NW side transmission / reception unit 12 corresponds to, for example, a communication board, communication software, or the like, and transmits / receives communication signals to / from the backhaul under the control of the transmission / reception control unit 11.

  The wireless transmission / reception unit 13 corresponds to, for example, a communication board or communication software, and performs wireless communication with the client terminal 2 existing within its own radio wave reach under the control of the transmission / reception control unit 11.

  The connection number management unit 14 manages the number of connections of currently connected client terminals. As a method of managing the number of connections of a client terminal, the connection number management unit 14 establishes a connection with the client terminal 2 and starts communication with the client terminal 2. Is stored in the connection number management DB 16. The connection number management unit 14 sequentially updates the communication time. Thereby, the last communication time of each client terminal 2 can be memorize | stored in connection number management DB16.

  Further, the connection number management unit 14 gives information on the number of connections of the currently connected client terminal to the wireless side control unit 113 of the transmission / reception control unit 11.

  Here, when the current number of client terminal connections is inserted into the probe response, the connection number management unit 14 refers to the connection number management DB 16 and goes back a predetermined time from the time when the probe request is received from the client terminal 2. The number of client terminals that have communicated up to the determined time is set as the number of client terminals that are currently connected, and this is given to the wireless-side control unit 113 of the transmission / reception control unit 11.

  In addition, when the current number of client terminal connections is inserted into the beacon signal, the connection number management unit 14 refers to the connection number management DB 16 until a time that is a predetermined time before the beacon signal transmission timing. The number of client terminals that have communicated is set as the number of client terminals that are currently connected, and this is given to the wireless-side control unit 113 of the transmission / reception control unit 11. Note that the currently connected and predetermined time may be the time from the previous beacon signal transmission timing to the current beacon signal transmission timing, and may be the number of client terminals that have communicated within that time.

  The connection number management DB 16 is a storage area for storing information in which the MAC address of the currently connected client terminal 2 is associated with the last communication time of each client terminal 2. Also, the connection number management DB 16 automatically deletes, for example, a MAC address that has no update for 24 hours. This prevents an increase in storage capacity. FIG. 4 is an explanatory diagram illustrating a format managed in the connection number management DB 16. As shown in FIG. 4, the MAC address and the last connection time stamp are managed in association with each other.

  The throughput measuring unit 15 constantly measures the throughput of the backhaul that is a wireless line, and provides the measured throughput information to the wireless side control unit 113 of the transmission / reception control unit 11. The measurement timing of the throughput measuring unit 15 constantly measures the throughput of the backhaul, and passes the average value of the throughput values within a predetermined time to the wireless side control unit 113 as throughput information. The method of measuring the throughput of the backhaul has no feature of the present invention, and various methods can be widely applied.

  The client terminal 2 corresponds to a personal computer having wireless communication means, for example. The wireless communication means included in the client terminal 2 may be one that is mounted on a personal computer or one that realizes wireless communication by being connected like a LAN card.

  FIG. 6 is an internal configuration diagram showing an internal configuration of the client terminal 2. As illustrated in FIG. 6, the client terminal 2 includes a wireless communication unit 21 that transmits and receives wireless data via a wireless line, a control unit 22 that controls the function of the client terminal 2, and a storage unit 23.

  The wireless communication unit 21 of the client terminal 2 corresponds to a general wireless communication unit according to a wireless LAN protocol such as IEEE802.11a, IEEE802.11b, IEEE802.11g, or IEEE802.11n.

  Functionally, the control unit 22 includes an extraction unit 222 that extracts the number of client terminal connections and backhaul throughput information from a wireless LAN MAC frame, and a connection destination selection unit 221 that selects a connection destination.

  The control unit 22 of the client terminal 2 transmits a probe request to the access points 1-1 and 1-2 according to such a wireless LAN protocol, receives a probe response that is a response signal thereof, and transmits the probe response to the probe response. Based on the number of client terminal connections and backhaul throughput information included, the access point has a connection destination selection unit 221 that determines which access points 1-1 and 1-2 are to be connected.

  When the beacon signal includes the number of connections of the client terminals of the access points 1-1 and 1-2 and the backhaul throughput information, the connection destination selection unit 221 extracts the client terminal extracted from the beacon signal. Based on the number of connections and the throughput information of the backhaul, it is determined to which access point 1-1 and 1-2 the connection request is made.

  As the connection destination selection method, the number of connections of the client terminals currently connected to the access points 1-1 and 1-2 and the backhaul throughput information are stored in the storage unit 23 and displayed as a connection destination list. It is possible to apply a method in which the user selects from among the selected ones. In addition, the connection destination selection unit 221 of the client terminal 2 automatically selects a connection with a small number of client terminals at the access points 1-1 and 1-2 and a connection with a small backhaul throughput value. Also good. In addition, the connection destination selection unit 221 calculates an evaluation value using an arithmetic expression for obtaining a comprehensive evaluation value based on the number of client terminal connections and the backhaul throughput value, and uses the evaluation value. The access point that requests connection may be selected. Thereby, the access point which can implement | achieve comfortable communication can be selected among the some access points 1-1 and 1-2.

(A-2) Operation of the First Embodiment Next, the operation of the access point pre-connection notification method of the first embodiment will be described with reference to the drawings.

  FIG. 5 is a flowchart illustrating the operation of the pre-connection notification method in the access points 1-1 and 1-2 according to the first embodiment. FIG. 5 illustrates a case where the access points 1-1 and 1-2 perform a pre-connection notification using a probe response.

  First, each access point 1-1 and 1-2 waits for reception of a frame transmitted from the client terminal 2 existing in the wireless cell (step S101).

  When the access points 1-1 and 1-2 receive a frame from the client terminal 2 (step S102), the transmission / reception control unit 11 analyzes the frame from the client terminal 2 and the frame is a probe request. Whether or not (step S103).

  When the MAC frame from the client terminal 2 is a Probe Request, the transmission / reception control unit 11 reads the connection number of the currently connected client terminal from the connection number management unit 14. Here, the connection number management unit 14 refers to the connection number management DB 16 and accesses the access points 1-1 and 1 between the time when the probe request received from the client terminal 2 is received by a predetermined time. -2 is calculated, and the number of client terminals is given to the transmission control unit 11 as the number of client terminals currently connected (step S104).

  Also, the transmission / reception control unit 11 reads the average throughput value of the backhaul from the throughput measurement unit 15 (step S105).

  Then, the frame creation unit 114 of the transmission / reception control unit 11 inserts the connection number of the currently connected client terminal and the backhaul throughput information into a portion not used in the Frame Control field of the MAC frame header, A probe response is returned (step S106).

  Thereby, the client terminal 2 that has transmitted the MAC frame can recognize the number of connections of the client terminals of the access points 1-1 and 1-2 and the throughput value of the backhaul before establishing the connection. The access points 1-1 and 1-2 that request connection can be determined.

  When determining that the MAC frame from the client terminal 2 is a frame other than the probe request in step S103, the connection number management unit 14 extracts the source MAC address from the received MAC frame (step S107). The number of connections is stored in the connection number management DB 16 in association with the time stamp (step S108). At this time, if the MAC address exists in the connection number management DB 16, the time stamp is updated, and if it does not exist, Insert is set.

  In addition, when the access points 1-1 and 1-2 periodically transmit beacon signals, the number of client terminals currently connected to the area not used by the MAC frame header and the backhaul throughput information are displayed. Insert it and send it out as a beacon signal.

  Next, the operation of the connection destination selection process in the client terminal 2 of the first embodiment will be described with reference to the drawings.

  FIG. 7 is a flowchart showing the operation of the connection destination selection process in the client terminal 2 of the first embodiment.

  First, the client terminal 2 that is to perform wireless communication transmits a wireless LAN MAC frame to the nearby access points 1-1 and 1-2 (step S201). At this time, the client terminal 2 starts a timer (step S202).

  Thereafter, the client terminal 2 receives the wireless LAN MAC frame transmitted by the access points 1-1 and 1-2. The client terminal 2 determines whether or not the received MAC frame is a probe response (step S203).

  When the received MAC frame is a probe response, the control unit 22 of the client terminal 2 determines the number of connection of the client terminal to which the source access point of the MAC frame is currently connected from the received header header of the probe response (step S205) and the average throughput value of the backhaul are extracted and acquired (step S206). The obtained number of client terminal connections and the average backhaul throughput value are stored in the storage unit 23 for each of the access points 1-1 and 1-2.

  On the other hand, when the received MAC frame is a beacon signal (step S204), the control unit 22 of the client terminal 2 connects the number of client terminals to which the transmission source access point of the MAC frame is currently connected from the beacon signal ( Step S205) and the average throughput value of the backhaul are extracted and acquired (Step S206). The obtained number of client terminal connections and the average backhaul throughput value are stored in the storage unit 23 for each of the access points 1-1 and 1-2.

  If the received wireless LAN MAC frame is neither a probe response nor a beacon signal, the process returns to step S203 to wait for the reception of MAC frames from the access points 1-1 and 1-2.

  When the client terminal 2 times out (step S207), a list of connection destinations of the access points 1-1 and 1-2 is displayed on the client terminal 2 (step S208), and a connection destination is selected (step S209). . In FIG. 7, the user selects a connection destination from the connection destination list display (step S210). Thereafter, a wireless LAN connection request is made to the selected access point.

  Thereby, when the client terminal 2 exists in an environment in which a plurality of access points 1-1 and 1-2 can be connected, a connection with an access point having a small throughput value can be selected.

(A-3) Effect of First Embodiment As described above, according to the first embodiment, in a wireless LAN, a client terminal hangs on an access point before connection with the access point is established. The number of client terminals and the throughput value are known.

  Further, according to the first embodiment, the client terminal can know the number of client connections and the throughput value only by periodically reading the beacon signal output from the access point.

  Furthermore, according to the first embodiment, the client terminal knows the number of client connections and the throughput value before connection, thereby enabling connection control to the access point incorporating the user's judgment. Also, it is possible to provide a function in which a client terminal is connected with priority to an access point having a small number of client connections and a high backhaul throughput value.

It is an internal block diagram which shows the internal structure of the access point of 1st Embodiment. It is a block diagram which shows the structure of the wireless LAN of 1st Embodiment. It is a block diagram explaining the function of the transmission / reception control part of 1st Embodiment. It is explanatory drawing explaining the management item of the connection number management DB of 1st Embodiment. It is a flowchart which shows the operation | movement of the notification before connection of 1st Embodiment. It is an internal block diagram which shows the internal structure of the client terminal of 1st Embodiment. It is a flowchart which shows the selection method of the connection destination in the client terminal of 1st Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1-1 and 1-2 ... Access point, 2 ... Client terminal, 11 ... Transmission / reception control part, 12 ... NW side transmission / reception part, 13 ... Wireless transmission / reception part, 14 ... Connection number management part, 15 ... Throughput measurement part, 16 ... Connection number management unit 111... Data conversion unit 112... NW control unit 113 113 wireless side control unit 114.

Claims (11)

An access point that wirelessly connects to one or more wireless terminals is a communication status information notification device that notifies each wireless terminal of its own communication status information,
Wireless communication means for performing wireless communication with each wireless terminal;
A connection number management means for managing the number of connections of the wireless terminal currently connected;
A throughput value measuring means for measuring the throughput value of the backhaul of the access point;
In the frame to be transmitted to each wireless terminal before connection establishment, the number of connections of the currently connected wireless terminal managed by the connection number management means and the throughput value of the backhaul are inserted as the communication status information. A communication status information notification device comprising: a transmission / reception control unit that causes the wireless communication unit to transmit a frame.   The communication status information notification device according to claim 1, wherein the frame is an authentication response frame that responds to an authentication request frame received from each of the wireless terminals.   The communication status information notification device according to claim 1, wherein the frame is a beacon frame that is periodically transmitted. The connection number management means
A storage unit for storing information of each wireless terminal being connected;
An extraction unit that extracts a source MAC address from a frame from each of the wireless terminals that are connected;
A management execution unit that associates the transmission source MAC address extracted by the extraction unit with the reception time information of the frame and stores it in the storage unit;
When the management execution unit receives an authentication request frame from each of the wireless terminals, the storage unit stores the number of the wireless terminals that have communicated between the time when the authentication request frame is received and a time that is back by a predetermined time. The communication status information notification device according to claim 1, wherein the communication status information notification device is transferred to the transmission / reception control unit as the number of connected wireless terminals currently connected.   5. The management execution unit, when receiving a frame from each of the wireless terminals stored in the storage unit, updates the reception time information of the wireless terminal in the storage unit. The communication status notification device described. An access point wirelessly connected to one or more wireless terminals is a communication status information notification method for notifying each wireless terminal of its own communication status information,
The access point includes wireless communication means, connection number management means, throughput value measurement means, and transmission / reception control means,
A wireless communication step in which the wireless communication means wirelessly communicates with each wireless terminal;
A connection number management step in which the connection number management means manages the number of connections of the wireless terminal currently connected;
The throughput value measurement means measures the throughput value of the backhaul of the access point, a throughput value measurement step,
In the frame transmitted by the transmission / reception control means to each wireless terminal before connection establishment, the number of wireless terminals currently connected and the throughput value of the backhaul managed by the connection number management means are indicated in the communication status. A communication status information notification method comprising: a transmission / reception control step of inserting the frame as information and transmitting the frame to the wireless communication means. An access point that wirelessly connects to one or more wireless terminals is a communication status information notification program for notifying each wireless terminal of its own communication status information,
Computer
Wireless communication means for performing wireless communication with each wireless terminal,
Connection number management means for managing the number of connections of the wireless terminal currently connected;
A throughput value measuring means for measuring the backhaul throughput value of the access point;
In the frame to be transmitted to each wireless terminal before connection establishment, the number of connections of the currently connected wireless terminal managed by the connection number management means and the throughput value of the backhaul are inserted as the communication status information. A communication status information notification program that functions as transmission / reception control means for transmitting a frame to the wireless communication means.   An access point wirelessly connected to one or more wireless terminals, comprising the communication status information notification device according to any one of claims 1 to 5. A wireless terminal that can wirelessly connect to a plurality of access points that transmit by inserting their own communication status information into a frame to be transmitted before establishing a connection,
Wireless communication means for performing wireless communication with each of the access points;
A communication situation in which the number of wireless terminals currently connected to the access point and the throughput value of the backhaul are extracted as the communication situation information from the frame received from each access point before establishing a connection with each access point. Information extraction means;
Storage means for storing the number of connected wireless terminals currently connected and the throughput value of the backhaul extracted by the communication status extracting means for each access point;
A connection destination selection means for selecting an access point having a relatively low throughput as a connection destination from the number of wireless terminals currently connected to the post-access point stored in the storage means and the throughput value of the backhaul; A wireless terminal comprising:   The wireless terminal according to claim 9, wherein the frame is an authentication response frame that responds to an authentication request frame transmitted by the wireless terminal.   The wireless terminal according to claim 9, wherein the frame is a beacon frame that is periodically transmitted.

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