JP2007142859A - Wireless network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To select an optimum access point among a plurality of access points existing in the periphery. <P>SOLUTION: A station executes searching of the access points existing therearound (S101). When finding out a plurality of the access points, the station sequentially executes throughput measurements for them (S102). The throughput measurement is applied to all the access points 11 found out by searching (S103). When the selection of the access points is executed automatically (Y in S104), an access point with the best throughput is selected among the access points (S105) and thereafter, the station carries out network connection (S106). When the access point connection is manually executed (N in S104), the access points available of network connection are displayed as a list together with the throughputs (S107), and network connection is applied to the access point selected by a user from the list (S108). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless network system, and more particularly to a wireless terminal connected to a wireless network such as a wireless LAN and a computer program used therefor.

  In recent years, wireless LAN has been widely used as one of means for connecting to the Internet. A wireless LAN is a form of LAN that can form a network without using a cable. Wireless LAN is being standardized by the Institute of Electrical and Electronic Engineers (IEEE), and currently there are three standards: IEEE802.11b, IEEE802.11g, and IEEE802.11a. Anyone can easily construct a LAN by constructing a wireless LAN system using network equipment compliant with these standards. Recently, it is possible to connect not only to a personal access point installed at home but also to a public access point installed outdoors or a paid access point provided by a provider.

  The wireless LAN is configured by a wireless network connection between a wireless terminal called a station and an access point serving as a bridge device. The station is a personal computer on which a wireless LAN adapter is mounted, for example. Wireless LAN adapters that provide wireless LAN functions to computers are compliant with standards such as IEEE802.11b, IEEE802.11a, and IEEE802.11g, and recently, devices that support a plurality of standards have become widespread.

When a station connects to a wireless network, it first receives a beacon broadcast from a nearby access point, searches for an access point 11 that can be connected to the network, and then automatically or manually connects to this access point. Do it. Here, when selecting an optimal access point as a connection destination from among a plurality of access points discovered by access point search, conventionally, priorities are assigned to the access points in advance, or RSSI (Received Signal Strength Indication). : Received signal strength) or packet error rate, the connection destination was selected (see Patent Documents 1 and 2).
JP 2000-101596 A JP 2004-289373 A

  However, as a result of the determination based on the RSSI and the packet error rate as described above, the access point is not necessarily an optimal access point. This is because not only the radio wave situation but also the congestion of data packets in the wireless LAN affects the communication quality of the access point. That is, when a plurality of stations are already connected to a certain access point, it is difficult to ensure high-speed communication even if the packet error rate is low. In other words, if there are many stations connected to the access point, or if a station connected to the access point is sending and receiving a large amount of data, even if the radio wave condition is good The new station connected to the access point has a problem that high-speed communication cannot be secured.

  In addition, general throughput measurement is performed by measuring the time it takes to download data from the throughput measurement server. However, since downloaded data passes through the Internet, routers, access points, etc. Due to the performance of the router and the Internet environment, there is a problem that the cause of the decrease in throughput is not clear.

  Therefore, an object of the present invention is to provide a wireless network system capable of selecting an optimum access point from a plurality of surrounding access points without being affected by router performance or the Internet environment. .

  The object of the present invention includes an access point having a relay function of a wireless network, and a wireless terminal capable of wireless connection to the access point, and the wireless terminal searches for a plurality of access points connectable to the network. A wireless network system, comprising: an access point search means for performing the measurement; and a throughput measurement means for measuring a throughput between each access point when one access point is selected from the plurality of access points. Achieved by: Here, the “plurality of access points” includes not only a plurality of physically different access points but also a plurality of logically different access points.

  In the present invention, it is preferable that the wireless terminal further includes network connection means for selecting an access point based on the throughput measurement result and automatically connecting to the access point. According to this, it is possible to connect to an access point with good throughput without a specific instruction from the user.

  In the present invention, it is preferable that the wireless terminal further includes display means for displaying the measurement result of the throughput on the screen together with the search result of the access point. According to this, the user can confirm the throughput status of each access point, and can manually select an access point in consideration of the throughput.

  In the present invention, it is preferable that the wireless terminal sequentially performs the access point search and the throughput measurement when a network function is activated. According to this, both access point search and throughput measurement can be started without requiring an instruction from the user.

  In the present invention, the wireless terminal may automatically perform the throughput measurement after performing the access point search, and when performing a throughput measurement instruction from a user after performing the access point search, Throughput measurement may be performed. In the former case, throughput measurement is performed without asking the user for instructions, so it is possible to select an access point that always considers the throughput measurement result.In the latter case, the throughput measurement is performed after waiting for instructions from the user. Since it starts, the user can select either access point selection considering the throughput or access point selection not considering the throughput, and throughput measurement can be omitted if unnecessary.

  In the present invention, the wireless terminal preferably performs the access point search and the throughput measurement during a network connection with an arbitrary access point. In particular, the access point search and the throughput measurement may be started when a preset time has elapsed, or when the RSSI from the currently connected access point falls below a predetermined threshold. Alternatively, it may be started when the packet error rate with the currently connected access point exceeds a predetermined threshold. According to these, the connection to the access point can be periodically reviewed, and a high-speed wireless network connection can always be ensured.

  The above object of the present invention is also a wireless terminal capable of wireless connection to an access point having a relay function of a wireless network, wherein the wireless terminal searches for a plurality of access points connectable to the network. And a wireless terminal comprising a throughput measuring means for measuring a throughput between each access point when one access point is selected from the plurality of access points. .

  The above object of the present invention is also to provide an access point search step for searching a plurality of access points connectable to a network to a computer capable of wireless connection to an access point having a relay function of a wireless network, and the plurality of access points. The present invention is also achieved by a computer program for executing a throughput measurement step for measuring the throughput between each access point when selecting one access point from among the access points.

  According to the present invention, it is possible to provide a wireless network system capable of selecting an optimum access point from a plurality of surrounding access points without being affected by router performance or the Internet environment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing a configuration of a wireless network system 10 according to a preferred embodiment of the present invention.

  As shown in FIG. 1, the wireless network system 10 includes an access point (AP) 11 and a station (STA) 12. In the present embodiment, as shown in the figure, there are two access points 11A and 11B around the station 12.

  The access point 11 is a relay device that connects the stations 12 in a wireless LAN, or connects the station 12 to a wired LAN or the Internet. The access point 11 has a built-in wireless LAN adapter 20 and enables wireless communication based on IEEE802.11b. There are two types of access point 11, a bridge type and a router type. The former only relays data transfer like a wired LAN hub, but the latter has a routing function and a NAT function, and plays a role of connecting different networks such as the Internet and a LAN. Such an access point 11 is called a wireless LAN router. In addition, the access point 11 often has various functions such as a firewall function, an encryption communication function such as WEP, WPA, and ESS-ID stealth, a user authentication function, and a file server function. In particular, the access point 11 has a throughput measurement function. Although the details will be described later, this throughput measurement function is a function for executing throughput measurement in cooperation with the station 12.

  The station 12 is a wireless terminal connected to a wireless network centered on the access point 11, and is, for example, a personal computer, a PDA, a POS terminal or the like on which a wireless LAN adapter is mounted. The wireless LAN includes an “ad hoc mode” in which direct communication is performed between stations, and an “infrastructure mode” in which communication is performed via the access point 11. The former is a network system formed only by a station without an access point, and the latter is a network system formed around the access point 11. In the infrastructure mode, connection to the Internet or a wired LAN is possible via the access point 11.

  The wireless LAN adapter 20 is a network adapter that supports IEEE802.11a, IEEE802.11b, IEEE802.11g, and the like. In IEEE802.11b, the transmission system is a direct spread spectrum system (DS-SS), the frequency used is 2.4 GHz, and the maximum communication speed is 11 Mbps. In IEEE802.11g, the transmission method is orthogonal frequency division multiplexing (OFDM), the frequency used is 2.4 GHz, and the maximum communication speed is 54 Mbps. In IEEE802.11a, the transmission method is orthogonal frequency division multiplexing (OFDM), the frequency used is 5 GHz, and the maximum communication speed is 54 Mbps. As a mounting form of the wireless LAN adapter 20, there are various forms such as a PCMCIA card type, a USB stick type, a PCI slot type, and an on-board type.

  In the wireless network system 10 having the above configuration, when a network connection from the station 12 to the access point 11 is performed, first, a beacon broadcast from the surrounding access point 11 is received, and the network connection is possible. The access point 11 is searched. For example, in the present embodiment, two access points 11A and 11B can be found as shown in FIG. Next, connection to either of these access points 11A and 11B is performed automatically or manually.

  The station 12 of this embodiment has a throughput measurement function in addition to a normal access point search function. This function measures the throughput with the access point 11 in cooperation with the access point 11. Similar to the access point search function, the throughput measurement function is realized mainly by an application program (also referred to as a utility program) executed on the station 12. When selecting one access point to be connected to the network from multiple access points, even if the access point with the best received signal strength is selected, high-speed communication is not possible if the actual throughput is low. When the throughput with the access point 11 is measured as in the present embodiment and the access point 11 is selected in consideration of the measurement result, high-speed communication with the access point 11 must be ensured. Is possible. Hereinafter, a procedure for connecting to an access point with throughput measurement will be described in detail.

  FIG. 2 is a flowchart showing a first example of a procedure for connecting to an access point by a station.

  As shown in FIG. 2, the station first searches for nearby network-accessible access points (S101). The access point search is executed, for example, when an instruction to search for an access point is given by the user or when the network function of the station is activated. Next, when a plurality of access points are found, the station sequentially performs throughput measurement for these access points (S102). Throughput measurement is performed for all access points found by the search (S103).

  When the access point is automatically selected (S104Y), the access point having the best throughput is selected from a plurality of access points that can be connected to the network (S105), and the network connection is established for this access point. Perform (S106). When the access point connection is performed manually (S104N), a list of access points that can be connected to the network is displayed together with the throughput (S107), and the network connection is performed to the access point selected by the user (S107). S108).

  FIG. 3 is a flowchart showing details of the throughput measurement (S102) of FIG.

  As shown in FIG. 3, in the throughput measurement, the station first transmits a packet for confirming the presence or absence of the throughput measurement function to the access point (S201). When an access point having such a function receives this packet, the access point returns a response packet indicating that it has a throughput confirmation function (S202). Thus, when the response packet from the access point is received within a certain time (S203Y), the station starts the first throughput measurement (S204 to S209). However, if the access point does not have a throughput confirmation function, no response packet is returned from the access point (S203N), and the throughput measurement ends.

  In the first throughput measurement, the station first activates a timer for measuring the data transfer time (S204), and then requests transmission of throughput measurement data (S205). Upon receiving this transmission request, the access point transmits throughput measurement data to the station by TCP (Transmission Control Protocol) (S206). Unlike UDP (User Datagram Protocol) or the like, TCP has an error correction function and the like, and realizes one-to-one communication in the form of a session, so it is possible to reliably know the completion of data transmission. The throughput measurement data is not particularly limited. For example, an arbitrary bit pattern of several MB can be used. On the other hand, the station side receives the throughput measurement data from the access point (S207), and when the reception is completed, stops the data transfer time measurement timer (S208). Then, the station calculates a reception throughput value by dividing the reception data amount by the measurement time (S209).

  Next, the station performs a second throughput measurement (S210 to S216). In the second throughput measurement, the station first activates a timer for measuring the data transfer time (S210), and then notifies the access point to receive data for throughput measurement (S211). The access point that has received this notification enters a state for receiving throughput measurement data (S212). Next, the station transmits data for throughput measurement to the access point by TCP (S213). As in the case of the first throughput measurement, for example, an arbitrary bit pattern of several MB can be used as the throughput measurement data. On the other hand, the access point side receives the throughput measurement data from the station (S214), and when the reception is completed, the station stops the data transfer time measurement timer (S215). Then, the station calculates a transmission throughput value by dividing the transmission data amount by the measurement time (S216).

  The above throughput measurement may be either one of transmission throughput and reception throughput. Further, both the transmission throughput and the reception throughput may be measured and an average value may be taken.

  As described above, according to the present embodiment, when a station selects any one of a plurality of access points to be connected to a wireless network, the throughput between the station and the access point is considered. Since the access point is selected, the optimum access point can be selected.

  Next, another example of the network connection procedure will be described in detail.

  FIG. 4 is a flowchart showing a second example of the network connection procedure. This example shows a case where the throughput measurement is selectively performed.

  As shown in FIG. 4, the station first searches for an access point in the surrounding area that can be connected to a network (S301). The access point search is executed, for example, when an instruction to search for an access point is received from the user or when the wireless network function of the station is activated. Then, the station displays this search result screen on the display (S302).

  FIG. 5 is a diagram showing an access point search result screen.

  As shown in FIG. 5, a list of access points connectable to the network is displayed on the access point search result screen 30. The information of each access point includes “network name (SSID)” 31 of the discovered access point, necessity / unnecessity of encryption key 32, “signal strength” 33, “channel” 34, “wireless mode” 35, etc. Information is displayed. Here, the “network name (SSID)” 31 serves to logically group the wireless networks. Since the access point accepts only communications of stations having the same SSID as that of itself, it is possible to prevent interference even in an environment where a plurality of wireless networks coexist on the same floor. The necessity / unnecessity 32 of the encryption key is indicated by a key mark. When the key mark is present, an encryption key of an encryption method such as WEP or WPA is required. “Signaling strength” 33 indicates RSSI, “channel” 34 indicates a frequency channel of the wireless network, and “wireless mode” 35 indicates whether the wireless network is IEEE802.11a / b / g. It is shown whether it is.

  Here, when the user selects one of the access points on the search result screen 30 and clicks the “connect” button 36 displayed on the search result screen 30 (S303Y), the station connects to the selected access point. Network connection is started (S309). When the “update” button 37 displayed on the search result screen 30 is clicked (S304Y), the access point is re-searched. On the other hand, after the check box 39 corresponding to each access point displayed on the search result screen 30 is turned on, when the “throughput measurement” button 38 is clicked (S305Y), the station turns the check box 39 on. Throughput measurement of the selected access point is executed in order (S306). Similar to the case of the first example, the throughput measurement is performed according to the procedure shown in FIG. 4, and is performed for all access points whose check boxes 39 are turned on (S307N). The throughput measurement result is displayed on the station display together with the access point search result (S308).

  FIG. 6 is a diagram showing an access point search result screen after throughput measurement.

  As shown in FIG. 6, a throughput measurement result is displayed on the access point search result screen 30 after the throughput measurement together with a list of access points connectable to the network. That is, information such as “network name (SSID)” 31 of the discovered access point, necessity / unnecessity of encryption key 32, “signal strength” 33, “throughput” 40, “channel” 34, “wireless mode” 35, etc. Is displayed.

  Thereafter, when the user selects one of the access points on the search result screen 30 and clicks the “connect” button 36 displayed on the search result screen 30 (S303Y), network connection to the access point is started (S303Y). S309). When the “update” button 37 displayed on the search result screen 30 is clicked (S304Y), the access point is re-searched. Further, when the “throughput measurement” button 38 displayed on the search result screen 30 is clicked (S305Y), the station again executes the throughput measurement for these access points (S306).

  As described above, according to the present embodiment, when a station selects any one of a plurality of access points to be connected to a wireless network, the throughput between the station and the access point is considered. Thus, an access point can be selected, and an optimum access point can be selected. In particular, since the throughput measurement is started when the user instructs to measure the throughput and the throughput measurement is performed by the user's selection, the access point selection considering the throughput and the normal access point selection not considering the throughput are performed. And can be freely selected. If the user desires, an access point with the best throughput can be selected from a plurality of access points connectable to the network. In this embodiment, the throughput is measured only for the access point selected by the check box 39. However, the check box may be omitted and the throughput of all access points found by the access point search may be measured. Is possible.

  FIG. 7 is a flowchart showing a third example of the network connection procedure. This example shows a case where the throughput measurement is performed while connected to the network.

  As shown in FIG. 7, when a preset time elapses during network connection to a certain access point (S401Y), the station executes a re-search for nearby network-connectable access points (S402). . Next, when a plurality of access points are found, the station sequentially performs throughput measurement for these access points (S403). Throughput measurement is performed for all network-accessible access points around the station (S404).

  Based on the measurement result of the throughput, it is determined whether there is an access point with a better throughput than the currently connected access point (S405). If there is such an access point (S405Y), The user is notified of the change of the connection destination (S406). When the user permits the change of the connection destination (S407Y), a new access point with a good throughput is selected (S408), and a network connection is made to this access point (S409). Note that if there is no access point with better throughput than the currently connected access point (S405N), or if the user does not allow the connection destination to be changed (S407N), the access point is not changed.

  As described above, according to the present embodiment, when a preset time elapses during connection with a certain access point, an access point re-search and a throughput measurement are started, and an optimum access point is found. In such a case, since the access point is switched, the connection to the access point can be reviewed periodically, and a high-speed wireless network connection can always be ensured. Note that the throughput measurement after re-searching for access points may be performed for all access points or only for newly found access points.

  FIG. 8 is a flowchart showing a fourth example of the network connection procedure. This example shows a case where the throughput measurement is performed while connected to the network.

  As shown in FIG. 8, when the RSSI from the currently connected access point falls below a predetermined threshold (S501Y), the station performs a search again for access points that can be connected to the surrounding network (S502). Next, when a plurality of access points are found, the station sequentially performs throughput measurement for these access points (S503). Throughput measurement is performed for all network-accessible access points around the station (S504).

  Then, based on the measurement result of the throughput, it is determined whether there is an access point with a better throughput than the currently connected access point (S505). If there is such an access point (S505Y), The user is notified of the change of the connection destination (S506). When the user permits the change of the connection destination (S507Y), a new access point with a good throughput is selected (S508), and a network connection is made to this access point (S509). Note that if there is no access point with better throughput than the currently connected access point (S505N), or if the user does not allow the connection destination to be changed (S507N), the access point is not changed.

  As described above, according to this embodiment, when the RSSI from the currently connected access point falls below a predetermined threshold, re-searching of the access point and throughput measurement are started, and an optimal access point is found. In this case, since the access point is switched, the connection to the access point can be reviewed as necessary, and a high-speed wireless network connection can always be ensured. The re-search of the access point needs to be performed when the previously searched access point search result is old, but may be omitted when the time has not passed since the previous search. In addition, the throughput measurement after re-searching the access points may be performed for all access points or only newly found access points.

  FIG. 9 is a flowchart showing a fifth example of the network connection procedure. This example also shows a case where the throughput measurement is performed while connected to the network.

  As shown in FIG. 9, when the packet error rate with the currently connected access point exceeds a predetermined threshold value (S601Y), the station performs a search again for access points that can be connected to the surrounding network (S602). ). Next, when a plurality of access points are found, the station sequentially performs throughput measurement for these access points (S603). The throughput measurement is performed for all access points that can be connected to the network around the station (S604).

  Based on the measurement result of the throughput, it is determined whether there is an access point with a better throughput than the currently connected access point (S605). If there is such an access point (S605Y), The user is notified of the change of the connection destination (S606). When the user permits the change of the connection destination (S607Y), a new access point with a good throughput is selected (S608), and a network connection is made to this access point (S609). If there is no access point with better throughput than the currently connected access point (S605N), or if the user does not allow the connection destination to be changed (S607N), the access point is not changed.

  As described above, according to the present embodiment, when the packet error rate with the currently connected access point exceeds a predetermined threshold, re-searching of the access point and throughput measurement are started, and the optimal access point is determined. If it is found, the access point is switched to, so that the connection to the access point can be reviewed as necessary, and a high-speed wireless network connection can always be ensured. The re-search of the access point needs to be performed when the previously searched access point search result is old, but may be omitted when the time has not passed since the previous search. In addition, the throughput measurement after re-searching the access points may be performed for all access points or only newly found access points.

  Next, various configurations of the access point will be described in detail with reference to FIGS. 10 to 13. The configuration of the access point can be divided into a case where a plurality of access points physically exist and a case where a plurality of access points logically exist in one apparatus.

  FIG. 10 shows a case where a plurality of access points physically exist and the communication standards of the access points are different from each other. (A) is a combination of 802.11a and 802.11b, and (b) is 802.11a. The combination of 802.11g, (c) shows the combination of 802.11b and 802.11g, respectively. FIG. 11 shows a case where a plurality of access points physically exist and the communication standards of the access points are the same. (A) is a combination of 802.11a, and (b) is 802.11b. The combination of each other, (c) shows the combination of 802.11g, respectively.

  On the other hand, FIG. 12 shows a so-called dual type access point, that is, a case where a plurality of access points logically exist in one apparatus, and the communication standards of each access point are different from each other. ) Shows a combination of 802.11a and 802.11b, and (b) shows a combination of 802.11a and 802.11g. FIG. 13 shows a case where there are a plurality of access points in one apparatus, and different channels with the same standard exist in the access points. (A) is 802.11a, (b) Indicates 802.11b, and (c) indicates 802.11g. In this case, it can be considered that a plurality of access points configured with different channels with the same standard exist in one apparatus. That is, in FIG. 13A, it can be seen that there is a first access point that uses channel m in 802.11a and a second access point that uses channel n in 802.11a. In (b), it can be seen that there is a first access point that uses channel m in 802.11b and a second access point that uses channel n in 802.11b. In FIG. It can be seen that there is a first access point using channel m in 802.11g and a second access point using channel n in 802.11g.

  As described above, the present invention selects not only one access point from a plurality of physically different access points but also one access point from a plurality of logically different access points. It is also possible to apply to this.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above embodiment, the wireless LAN system corresponding to the so-called IEEE802.11 standard has been described as an example. However, the present invention is not limited to this, and an access point having a wireless network relay function, The present invention can be applied to a wireless network system of any communication system configured with a wireless terminal that can wirelessly connect to an access point.

FIG. 1 is a schematic diagram showing a configuration of a wireless network system 10 according to a preferred embodiment of the present invention. FIG. 2 is a flowchart showing a first example of a procedure for connecting to an access point by a station. FIG. 3 is a flowchart showing details of the throughput measurement (S103) of FIG. FIG. 4 is a flowchart showing a second example of the network connection procedure. This example shows a case where the throughput measurement is selectively performed. FIG. 5 is a diagram showing an access point search result screen. FIG. 6 is a diagram showing an access point search result screen after throughput measurement. FIG. 7 is a flowchart showing a third example of the network connection procedure. FIG. 8 is a flowchart showing a fourth example of the network connection procedure. FIG. 9 is a flowchart showing a fifth example of the network connection procedure. FIG. 10 is a schematic diagram showing a configuration of a wireless network system according to another preferred embodiment of the present invention. FIG. 11 is a schematic diagram showing a configuration of a wireless network system according to another preferred embodiment of the present invention. FIG. 12 is a schematic diagram showing a configuration of a wireless network system according to another preferred embodiment of the present invention. FIG. 13 is a schematic diagram showing a configuration of a wireless network system according to another preferred embodiment of the present invention.

Explanation of symbols

10 wireless network system 11 access point 11A access point 11B access point 12 station 20 adapter 21 bus interface unit 22 MAC unit 23 baseband unit 24 RF unit 25 antenna 26 system control unit 27 memory 30 search result screen 31 “network name (SSID) "32" Encryption key necessity column 33 "Signal strength" field 34 "Channel" field 35 "Wireless mode" field 36 "Connect" button button 37 "Update" button 38 "Throughput measurement" button 39 Checkbox

Claims (9)

An access point having a wireless network relay function, and a wireless terminal capable of wireless connection to the access point,
The wireless terminal measures the throughput between the access point search means for searching for a plurality of access points connectable to the network and each access point when selecting one access point from the plurality of access points. A wireless network system comprising a throughput measuring means.   The wireless network system according to claim 1, wherein the wireless terminal further includes network connection means for selecting an access point based on the throughput measurement result and automatically connecting to the access point.   The wireless network system according to claim 1, wherein the wireless terminal further includes display means for displaying the measurement result of the throughput on a screen together with a search result of the access point.   The wireless network system according to claim 1, wherein the wireless terminal sequentially performs the access point search and the throughput measurement when a network function is activated.   The wireless network system according to claim 1, wherein the wireless terminal automatically performs the throughput measurement after performing the access point search.   The wireless network system according to any one of claims 1 to 3, wherein the wireless terminal performs the throughput measurement when the user instructs to measure the throughput after performing the access point search. .   The wireless network system according to any one of claims 1 to 6, wherein the wireless terminal performs the access point search and the throughput measurement during a network connection with an arbitrary access point. A wireless terminal capable of wirelessly connecting to an access point having a wireless network relay function,
The wireless terminal measures the throughput between the access point search means for searching for a plurality of access points connectable to the network and each access point when selecting one access point from the plurality of access points. A wireless terminal comprising a throughput measuring means. To a computer capable of wireless connection to an access point having a wireless network relay function,
An access point search step for searching for a plurality of network-accessible access points;
A computer program for executing a throughput measurement step of measuring a throughput with each access point when selecting one access point from the plurality of access points.

Images