JP4784781B2 - Information collection method, information collection system, and mobile radio terminal - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly to collection of actual measurement values of reception conditions for maintenance and optimization of a wireless communication system.

  Currently, usage fees are being reduced in wireless communication systems such as mobile phones, PHS, and public wireless LANs. Therefore, it is necessary to suppress the operation cost of the wireless communication system as much as possible. Then, how to realize adjustment for maintenance and optimization of the wireless communication system at a low cost is a big problem for the communication carrier.

  Adjustment for maintenance and optimization of a wireless communication system is maintenance adjustment performed in order to stably operate the system without a problem over a long period of time. Examples of adjustment targets include the transmission power of the radio base station and the tilt angle of the antenna.

  Maintenance and adjustment of a wireless communication system are generally performed based on an evaluation study using a wireless network design simulator. In order to improve the simulation accuracy, reception status information measured in a service area (hereinafter referred to as coverage) of the wireless communication system and position information where the measured values are measured are input to the design simulator.

  As reception status information, for example, in a CDMA system, there are reception quality and reception strength of a common pilot channel. These reception status information are indispensable for maintenance and adjustment because it is an index for determining whether or not the service of the radio communication system can be used by the mobile radio terminal at the position where the reception status is measured. Useful information.

  Conventionally, reception status information has been measured by a dedicated measurement vehicle or a specialized measurement team. FIG. 8 is a diagram for explaining a conventional method for collecting reception status information of a wireless communication system. As shown in FIG. 8, in the conventional method, the members of the measurement team travel around the reception status measurement vehicle 94 to cover the wireless communication system in which the wireless base stations 91, 92, and 93 are connected to the network 90. The reception status information was measured. The reception status information was recorded in association with the position information measured using the position measurement device 94a provided in the reception status measurement vehicle 94.

  Then, the telecommunications carrier performs maintenance and adjustment of the wireless communication system using the measured reception status information, and operates the wireless communication system stably without any defects.

As another conventional method of collecting reception status information, there is a method in which a general mobile radio terminal owned by a user measures reception status information and collects the measurement results. (For example, refer to Patent Document 1). According to this method, reception status information can be collected quickly and easily without using a reception status measurement vehicle as shown in FIG.
JP 2002-152104 A

  In the method of measuring the reception status information using the reception status measurement vehicle as shown in FIG. 8, since the reception status measurement vehicle 94 is run and actually measured, a plurality of members such as a driver, a driving instructor, and a measurer are used. Requires a measurement team. For this reason, the cost for obtaining and maintaining the reception status measurement vehicle and the labor cost for collecting the reception status are enormous, which hinders the reduction of the operation cost of the wireless communication system. Also, with this method, since it is necessary to run around the coverage of the wireless communication system using a limited number of reception status measurement vehicles, it takes a long time to collect reception status information.

  It is also conceivable to measure the reception status information in the coverage by a large number of measurement teams without using the reception status measurement vehicle 94. In this case, the reception status measuring vehicle 94 is not necessary, but the labor cost is further increased.

  In a CDMA wireless communication system, the load, that is, the amount of interference changes as a user connects to the system, and the coverage of the wireless communication system fluctuates with time. In order to maintain stable coverage in the process where the number of users gradually increases and the system matures, it is necessary to periodically collect reception status information. Therefore, the cost of collecting the reception status information is very large compared to other systems in order to periodically and repeatedly run the reception status measurement vehicle and collect the reception status information.

  Further, in the CDMA wireless communication system, there may be a situation in which the usage status of the user in the measured area changes while measuring the reception status information while traveling in the coverage by the reception status measurement vehicle. .

  On the other hand, as described in Patent Document 1, according to the method of measuring reception status information by a mobile radio terminal used by a general user, a reception status measurement vehicle is not required, and a measurement team of multiple members is also available. Since it is not necessary, reception status information can be collected at low cost. And since it does not run around the coverage of a radio | wireless communications system with a reception condition measurement vehicle, but makes a mobile radio terminal which a general user uses measure reception condition information, a large amount of information can be collected in a short time.

  However, in the CDMA wireless communication system, the reception situation changes due to various factors, and the change in the reception situation affects the operation of the system in various forms. For example, it is conceivable that the reception situation changes due to time factors. In addition, it is conceivable that the reception situation changes due to a change in load caused by user concentration or the like. Further, it is conceivable that the frequency of forced disconnection of communication by the network changes due to the change in the reception status. Further, it is conceivable that the frequency of handover failures changes.

  However, in the method as described in Patent Document 1, since the relationship between the reception status information and the position information is only collected, the cause of the change in the reception status and the phenomenon caused by it can be accurately grasped. I could not.

  An object of the present invention is to provide a wireless communication information collection method, an information collection system, and a mobile wireless terminal for easily collecting a reception status associated with the operation of a wireless communication system at low cost.

In order to achieve the above object, an information collection method according to an aspect of the present invention includes:
Monitoring the status of communication in a mobile radio terminal and detecting that the throughput of the communication has fallen below a predetermined threshold;
When it is detected that the throughput has fallen below a predetermined threshold;
Obtaining a position of the mobile radio terminal;
Sending information including the reception status and the location to an information collection server;
I have a,
Information on the reliability of the position is further added to the information including the reception status and the position, and the information is sent to the information collection server .

An information collection system according to an aspect of the present invention includes:
When monitoring the communication status in the mobile radio terminal and detecting that the throughput of the communication has fallen below a predetermined threshold, the reception status of the radio signal and the location of the radio signal are acquired, and the information including the reception status and the location At least one mobile radio terminal transmitting
Said mobile receives the information from the wireless terminal, possess the information collecting server to be recorded therein,
The mobile radio terminal adds information related to the reliability of the position to the information including the reception status and the position, and sends the information to the information collection server .

A mobile radio terminal according to an aspect of the present invention includes a communication status acquisition unit that acquires a status of communication in the mobile radio terminal;
A reception status acquisition unit for acquiring the reception status of the radio signal;
A position information acquisition unit that acquires its own position;
Upon detecting that the communication throughput acquired by the communication status acquisition unit is below a predetermined threshold, the reception status acquisition unit is instructed to acquire the reception status, and the location information acquisition unit acquires the location. instructs said the reception status and the position is obtained, have a control unit that transmits information including the position and the reception status to the information collecting server,
The control unit adds information related to the reliability of the position to the information including the reception status and the position, and sends the information to the information collection server .

  According to the present invention, the reception status information and location information are acquired when the mobile radio terminal is in a predetermined communication status, information including them is notified to the information collection server, and the information collection server records it. Therefore, the reception status at each position in the coverage can be acquired in association with the communication status, which is useful for maintenance and adjustment of radio equipment.

  An embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram showing the configuration of the wireless communication system of the present embodiment. The wireless communication system of the present embodiment includes wireless base stations 11, 12, 13, a network 2, and an information collection server 1. Mobile radio terminals 21 and 22 can be connected to this radio communication system. In practice, there are a large number of mobile radio terminals, but only two are shown here. Also, there are many radio base stations in the radio communication system, but only three are shown here.

  The mobile radio terminals 21 and 22 are movable terminals such as mobile phones, PHS, and public wireless LANs used by users in the radio communication system. However, the user who uses the mobile radio terminals 21 and 22 is a user who has agreed to provide his / her own position and reception status of radio signals from the radio base station for stable operation of the radio communication system.

  FIG. 2 is a block diagram showing the configuration of the mobile radio terminal according to the present embodiment. Since the mobile radio terminal 21 and the mobile radio terminal 22 shown in FIG. 1 have the same configuration, FIG. 2 shows the mobile radio terminal 21 as a representative.

  Referring to FIG. 2, the mobile radio terminal 21 includes a position information acquisition unit 31, a reception status acquisition unit 32, a communication status acquisition unit 33, a time information acquisition unit 34, a control unit 35, and a display unit 36.

  The position information acquisition unit 31 acquires information indicating the position of the mobile radio terminal 21. The position information acquisition unit 31 measures its own position by, for example, GPS (Global Positioning System) and acquires it as position information.

  The reception status acquisition unit 32 acquires information indicating the reception status of radio signals from the radio base station. This reception status information is useful for maintenance and adjustment of the wireless communication system. Examples of the reception status information include Ec / Io (received signal power to interference power ratio per chip) that is the reception quality of the common pilot channel in the CDMA wireless communication system, reception strength, and the like.

  The communication status acquisition unit 33 can acquire information indicating the communication status of user communication. This communication status information is information indicating the status of communication using a radio signal. Examples of the communication status information include information indicating that the user communication is forcibly disconnected without receiving a radio signal from the radio base station, or information indicating that transmission to other mobile radio terminals cannot be performed. In addition, information indicating that the handover has failed, information indicating communication throughput, and the like are also included.

  The time information acquisition unit 34 can acquire time information such as the time when the reception status information is acquired, the time when the measurement of the reception status is started, and the time when the measurement is performed.

  When the reception status information is acquired together with the position information and the time information, the control unit 35 collectively collects them as actual measurement information and notifies the information collection server 1 via one of the radio base stations and the network 2. The actual measurement information is information including position information, time information, and reception status information.

  Further, the control unit 35 instructs the reception status acquisition unit 32 to acquire the reception status information, triggered by the fact that the communication status information acquired by the communication status acquisition unit 33 satisfies a predetermined condition. 31 is instructed to acquire position information, and the time information acquisition unit 34 is instructed to acquire measurement time and measurement time. For example, when user communication such as a call or data communication is forcibly disconnected, the mobile radio terminal 21 acquires reception status information using that as a trigger. For example, the mobile radio terminal 21 may be triggered by the fact that the communication throughput falls below a predetermined threshold. Moreover, it is good also as a trigger that the call was made in order to start user communication.

  When the control unit 35 receives the information indicating the valuable points from the information collection server 1, the control unit 35 displays the information on the display unit 36.

  A valuable point is a point having a value corresponding to money or the like, and is given to a user as a consideration for providing actual measurement information. As an example of the valuable points, points that can be used in electronic commerce on the Internet included in the network 2 can be considered. As other examples, various types of cyber cash and electronic money can be considered. As yet another example, points that have value in the core network of the wireless communication system included in the network 2, that is, points that can be offset with the usage fee of the wireless communication system can be considered.

  The display unit 36 displays the valuable point information based on an instruction from the control unit 35.

  The wireless base stations 11, 12, and 13 are devices that transmit and receive wireless signals to and from the wireless mobile terminals 21 and 22, and are, for example, base stations for mobile phone systems and PHS systems, access points such as wireless LANs, and the like.

  The network 2 includes a core network of the wireless communication system according to the present embodiment, for example, a network configured by a mobile exchange of a mobile phone system. Here, the network 2 also includes the Internet connected via a gateway (not shown).

  The information collection server 1 is configured by an information processing device such as a workstation. The information collection server 1 receives and records the actual measurement information transmitted from the mobile radio terminals 21 and 22. Further, when the information collection server 1 receives and records the actual measurement information from the mobile radio terminals 21 and 22, the information collection server 1 sends the valuable point information given to the user of the mobile radio terminals 21 and 22 as the transmission source to the network 2 and the radio base station. To the mobile radio terminals 21 and 22.

  FIG. 3 is a diagram illustrating an operation when the radio communication system and the mobile radio terminal according to the present embodiment collect reception conditions. In FIG. 3, only the mobile radio terminal 21 and the information collection server 1 are focused.

  In advance, the dedicated software is installed in the mobile radio terminal of the user who has agreed to provide actual measurement information including reception status information and position information in exchange for the acquisition of valuable points, and the mobile radio terminals 21 and 22 of this embodiment are installed. Keep it. By installing this dedicated software, the mobile radio terminals 21 and 22 can automatically perform the following operations.

  Referring to FIG. 3, the mobile radio terminal 21 monitors the communication status of user communication, and detects that the communication status information satisfies a predetermined condition as a trigger (step 101). When detecting the trigger, the mobile radio terminal 21 measures the reception status and obtains it as reception status information (step 102). At that time, the mobile radio terminal 21 also acquires time information. The mobile radio terminal 21 may continuously measure the reception status instead of the operations in steps 101 and 102, and when a trigger is detected, the reception status at that time may be used for subsequent processing.

  Next, the mobile radio terminal 21 measures its own position by GPS or the like and acquires it as position information (step 103). Note that the mobile radio terminal 21 may not be able to acquire position information depending on the position and environment at that time. In that case, the mobile radio terminal 21 may use position information acquired at a past time closest to the present time. The mobile radio terminal 21 preferably adds information indicating that the reliability is low to the position information. Next, the mobile radio terminal 21 sends actual measurement information including position information, time information, and reception status information to the information collection server 1 (step 104).

  In order to reflect the actual measurement information in the adjustment at an early stage, the mobile radio terminal 21 preferably sends the actual measurement information including them to the information collection server 1 immediately after obtaining the reception status information and the position information. However, when a forced disconnection of user communication or a handover failure is used as a trigger, measured information cannot be sent to the information collection server 1 immediately after the trigger is detected. Therefore, in that case, the mobile radio terminal 21 may send actual measurement information after the line becomes available.

  The information collection server 1 receives the actual measurement information from the mobile radio terminal 21 and records it in the internal memory (step 105). Actually, actually measured information is similarly sent from a plurality of mobile radio terminals, so that the information collection server 1 collects reception status information at various positions in the coverage.

  The actual measurement information collected by the information collection server 1 is associated with various operations of the wireless communication system depending on the trigger condition. For this reason, not only a map in which the position and the reception situation are merely associated with each other but also a map associated with various situations is obtained. For example, a map of information acquired when user communication is forcibly disconnected is useful for estimating an area where radio wave arrival conditions are poor. A map of information obtained when a handover failure occurs helps to estimate the location where coverage is interrupted between radio base stations. In addition, the information map acquired when the throughput falls below a predetermined threshold is useful for estimating a position with poor communication quality. In addition, a map of information acquired at the time of calling is useful for estimating a position where many users are concentrated.

  In addition, the measurement time indicated in the time information included in the actual measurement information is useful for estimating a temporal change in the communication status and the reception status.

  Next, the information collection server 1 gives valuable points to the user of the mobile wireless terminal 21 and sends valuable point information indicating the consideration for providing information (valuable points) to the mobile wireless terminal 21 (step 106). Immediately, the information collection server 1 preferably sends the valuable point information to the mobile radio terminal 21 immediately after the actual measurement information is sent from the mobile radio terminal 21. However, in order to prevent an increase in traffic, the transmission timing of the valuable point information may be delayed. For example, the information collection server 1 may transmit after collecting some valuable point information. Moreover, the information collection server 1 may transmit valuable point information collectively in the middle of the night.

  Moreover, the method of giving actual valuable points varies depending on the mode of valuable points. For example, in the case of a valuable point that can be offset with the usage fee of the wireless communication system, it may be recorded and managed in the information collection server 1, a billing center (not shown), a valuable point management dedicated server, or the like. In the case of electronic money linked to a bank account, valuable points may be notified to a bank server.

  When actual measurement information is collected in the information collection server 1 in this manner, the core network 2 of the wireless communication system adjusts various parameters such as maintenance of the wireless base stations 11, 12 and 13, transmission output and antenna tilt angle. To use.

  As described above, according to the present embodiment, the reception status information and the position information are acquired when the user's mobile radio terminal enters a predetermined communication status as a trigger, and the actual measurement information including them is obtained as the information collection server 1. Therefore, carriers can obtain a lot of actual measurement information associated with the communication status by paying inexpensive valuable points to the user, and immediately and effectively perform maintenance and adjustment of the radio base station. It can be performed, and man-hours and costs for them can be reduced.

  In addition, according to the present embodiment, a large amount of actual measurement information can be collected immediately and reflected in maintenance and adjustment. Therefore, as in CDMA, the load situation on the radio line due to the connection of the mobile radio terminal, that is, interference A remarkable effect can be obtained in the process of gradually increasing the number of users of the wireless communication system whose coverage varies depending on the amount.

  In addition, according to the present embodiment, a lot of actual measurement information about an area where many users gather is obtained, and an immediate and accurate adjustment is important in such an area. It is possible to make an immediate and accurate adjustment using a lot of actual measurement information.

  Further, in the present embodiment, the actual measurement information is acquired only from the mobile wireless terminal of the user who has agreed to provide the location information and the reception status information, and therefore it is not desired to send the location information and the reception status information to the communication carrier. Information is not automatically acquired from the user, and there is no inconvenience for the user in terms of privacy and power consumption of the mobile radio terminal.

  Another embodiment of the present invention will be described.

  The wireless communication system of this embodiment has the same configuration as that in FIG. The trigger for the mobile radio terminals 21 and 22 to measure the actual measurement information is different from the operation shown in FIG. 3 in that it is given from the information collection server 1 to a plurality of mobile radio terminals simultaneously.

  FIG. 4 is a block diagram showing a configuration of a mobile radio terminal according to another embodiment of the present invention. The mobile radio terminal in FIG. 4 differs from that in FIG. 2 in that it has a trigger information receiving unit 37 instead of the communication status receiving unit 33.

  The trigger information receiving unit 37 is information serving as a trigger for starting measurement of actual measurement information, and is sent from the information collection server 1 to the mobile radio terminal. The information collection server 1 of the present embodiment can simultaneously transmit trigger information to a plurality of mobile radio terminals in order to start measurement of actual measurement information.

  In addition, the control unit 35 of the present embodiment instructs the reception status acquisition unit 32 and the position information acquisition unit 31 to measure the reception status and the location information, triggered by the reception of the trigger information from the information collection server 1, The time information acquisition unit 34 is instructed to acquire the measurement time and the like.

  FIG. 5 is a diagram illustrating an operation when the radio communication system and the mobile radio terminal according to the present embodiment collect reception conditions. In FIG. 5, only the mobile radio terminal 21 and the information collection server 1 are focused.

  In advance, the dedicated software is installed in the mobile radio terminal of the user who has agreed to provide actual measurement information including reception status information and position information in exchange for the acquisition of valuable points, and the mobile radio terminals 21 and 22 of this embodiment are installed. Keep it.

  Referring to FIG. 5, first, the information collection server 1 transmits trigger information to a plurality of mobile radio terminals simultaneously (step 201). For example, the information collection server 1 transmits trigger information in a specific time zone in which the reception status is desired to be observed, such as a time zone in which the system load is statistically high or low. When receiving the trigger information, the mobile radio terminal 21 measures the reception status and obtains it as reception status information (step 202). At that time, the mobile radio terminal 21 also acquires time information.

  Thereafter, the processing of steps 203 to 207 is the same as the processing of steps 103 to 107 shown in FIG.

  The actual measurement information collected by the information collection server 1 is acquired simultaneously by a plurality of mobile radio terminals triggered by reception of trigger information. Therefore, it is not possible to obtain a map that simply associates the position and the reception status, but it is possible to obtain the reception status of each position in the coverage at the same time, and the relevance of the change in the reception status of each position It is useful for estimation.

  As described above, according to the present embodiment, the reception status information and the position information are acquired by using the trigger information received simultaneously from the information collection server 1 to a plurality of mobile radio terminals as a trigger, and the actual measurement information including them. Is notified to the information collection server 1, so that the telecommunications carrier can obtain a lot of measured information immediately at the same time by paying the user with inexpensive valuable points, and can perform maintenance and adjustment of the radio base station. While being able to carry out immediately and effectively, the man-hour and cost concerning them can be reduced.

  Still another embodiment of the present invention will be described.

  The wireless communication system of this embodiment has the same configuration as that in FIG. As shown in FIG. 3, the trigger for the mobile radio terminals 21 and 22 to measure the actual measurement information is given simultaneously to the plurality of mobile radio terminals from the information collection server 1 as shown in FIG. It differs from the operation shown in FIG. 3 in that there is something that the mobile radio terminal itself detects.

  FIG. 6 is a block diagram showing a configuration of a mobile radio terminal according to still another embodiment of the present invention. The mobile radio terminal in FIG. 6 differs from that in FIG. 2 in that it has both a communication status receiving unit 33 and a trigger information receiving unit 37. The communication status receiving unit 33 is the same as in FIG. 2, and the trigger information receiving unit 37 is the same as in FIG.

  In addition, the control unit 35 according to the present embodiment acquires the reception status triggered by the communication status information serving as a trigger acquired by the communication status acquisition unit 33 or the trigger information reception unit 37 receiving the trigger information. The unit 32, the position information acquisition unit 33, and the time information acquisition unit 34 are instructed.

  FIG. 7 is a diagram illustrating an operation when the radio communication system and the mobile radio terminal according to the present embodiment collect reception conditions. In FIG. 7, only the mobile radio terminal 21 and the information collection server 1 are focused.

  In advance, the dedicated software is installed in the mobile radio terminal of the user who has agreed to provide actual measurement information including reception status information and position information in exchange for the acquisition of valuable points, and the mobile radio terminals 21 and 22 of this embodiment are installed. Keep it.

  Referring to FIG. 7, first, the information collection server 1 transmits trigger information to a plurality of mobile radio terminals simultaneously (step 301), or the mobile radio terminal 21 determines that the communication status information satisfies a predetermined condition. This is detected as a trigger (step 302).

  When any of the triggers occurs, the mobile radio terminal 21 measures the reception status and acquires it as reception status information (step 303). At that time, the mobile radio terminal 21 also acquires time information.

  Thereafter, the processing of steps 304 to 308 is the same as the processing of steps 103 to 107 shown in FIG.

  The actual measurement information collected by the information collection server 1 is associated with various operations of the wireless communication system or those at the same time depending on the trigger condition. Therefore, not only a map in which the position and the reception situation are merely associated with each other but also a map associated with various situations or a map indicating the reception situation of each position in the coverage at the same time is obtained.

  As described above, according to the present embodiment, the mobile radio is triggered by the fact that the predetermined communication status is reached or the trigger information transmitted simultaneously from the information collection server 1 to a plurality of mobile radio terminals is received. Since the terminal acquires the reception status information and the position information and notifies the information collection server 1 of the actual measurement information including them, the communication carrier pays an inexpensive valuable point to the user, so that the actual measurement associated with the communication status is obtained. It is possible to immediately obtain a large amount of information and actual measurement information at the same time, and it is possible to immediately and effectively perform maintenance and adjustment of the radio base station, and it is possible to reduce the man-hours and costs associated with them.

1 is a system configuration diagram illustrating a configuration of a wireless communication system according to an embodiment of the present invention. It is a block diagram which shows the structure of the mobile radio | wireless terminal by one Embodiment of this invention. It is a figure which shows operation | movement when the radio | wireless communications system and mobile radio | wireless terminal by one Embodiment of this invention collect reception conditions. It is a block diagram which shows the structure of the mobile radio | wireless terminal by other embodiment of this invention. It is a figure which shows operation | movement when the radio | wireless communications system and mobile radio | wireless terminal by other embodiment of this invention collect reception conditions. It is a block diagram which shows the structure of the mobile radio | wireless terminal by further another embodiment of this invention. It is a figure which shows operation | movement when the radio | wireless communications system and mobile radio | wireless terminal by further another embodiment of this invention collect reception conditions. It is a figure for demonstrating the conventional method of collecting the reception status information of a radio | wireless communications system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information collection server 2 Network 11, 12, 13 Wireless base station 21, 22 Mobile wireless terminal 31 Location information acquisition part 32 Reception status acquisition part 33 Communication status acquisition part 34 Time information acquisition part 35 Control part 36 Display part 37 Trigger information reception Part 101-107, 201-207, 301-308 steps

Claims (6)

Monitoring the status of communication in a mobile radio terminal and detecting that the throughput of the communication has fallen below a predetermined threshold;
When it is detected that the throughput has fallen below a predetermined threshold;
Obtaining a position of the mobile radio terminal;
Sending information including the reception status and the location to an information collection server;
I have a,
An information collection method comprising: adding information related to reliability of the position to the information including the reception status and the position and sending the information to the information collection server . The information collection method according to claim 1 , wherein the mobile radio terminal is a CDMA mobile radio terminal. When monitoring the communication status in the mobile radio terminal and detecting that the throughput of the communication has fallen below a predetermined threshold, the reception status of the radio signal and the location of the radio signal are acquired, and the information including the reception status and the location At least one mobile radio terminal transmitting
Said mobile receives the information from the wireless terminal, possess the information collecting server to be recorded therein,
The mobile radio terminal adds information related to the reliability of the position to the information including the reception status and the position, and sends the information to the information collection server . The information collection system according to claim 3 , wherein the mobile radio terminal is a CDMA mobile radio terminal. A communication status acquisition unit for acquiring the communication status of the mobile radio terminal;
A reception status acquisition unit for acquiring the reception status of the radio signal;
A position information acquisition unit that acquires its own position;
Upon detecting that the communication throughput acquired by the communication status acquisition unit is below a predetermined threshold, the reception status acquisition unit is instructed to acquire the reception status, and the location information acquisition unit acquires the location. instructs said the reception status and the position is obtained, have a control unit that transmits information including the position and the reception status to the information collecting server,
The said control part is a mobile radio terminal which adds the information regarding the reliability of this position to the information containing the said reception condition and the said position, and sends it to the said information collection server . The mobile radio terminal according to claim 5 , wherein the mobile radio terminal is a CDMA mobile radio terminal.

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