JP5971094B2 - MEASUREMENT SYSTEM, MEASUREMENT CONTROL DEVICE, AND MEASUREMENT METHOD - Google Patents

Description

  The present invention relates to a measurement system, a measurement control device, and a measurement method.

  Conventionally, with the development of wireless communication technology, various technologies for measuring wireless quality for each area have been proposed. Particularly in recent years, with the introduction of LTE (Long Term Evolution), which is a new wireless communication system that replaces W-CDMA (Wideband-Code Division Multiple Access), MME (Mobility Management Entity) on the core network has improved wireless quality. It is managed for each area and notified to the upper data center. For example, when the MME transmits a signal (Measurement Request) for requesting measurement of radio quality to a mobile station connected to the base station via the base station, the mobile station transmits the request signal to its own mobile station. It is determined whether or not the ID is included. When the request signal includes the ID of the mobile station, the mobile station determines that the wireless quality measurement is requested for the mobile station and starts measuring the wireless quality at the current position. The measurement result is returned to the MME via the base station as a wireless quality response signal (Measurement Report) together with a positioning result (position information of the mobile station) by GPS (Global Positioning System). Thereby, MME can detect the radio | wireless quality in the present position of a mobile station.

JP 2009-177719 A JP 2008-77562 A

  However, the wireless quality measurement technique described above has the following problems because it assumes that the mobile station to be measured is connected to the network. That is, when there is no mobile station connected to the network in an area where measurement of radio quality is desired, the MME cannot acquire radio quality information in the area from the mobile station. In this case, the MME may wait for the appearance of a mobile station connected to the network within the area, but it takes time and the mobile station does not necessarily connect to the network. Thereby, the certainty of the wireless quality measurement is hindered. As another means, for example, the base station may actively request connection to the mobile station in the area in accordance with an instruction from the MME. It is difficult to realize connection from the network side.

  The disclosed technology has been made in view of the above, and provides a measurement system, a measurement control device, and a measurement method capable of measuring radio quality even in an area where there is no mobile station connected to a network. For the purpose.

  In order to solve the above-described problems and achieve the object, a measurement system disclosed in the present application includes, in one aspect, a measurement control device and a mobile station capable of communicating with the measurement control device. The measurement control apparatus includes a transmission unit that transmits a predetermined signal. The mobile station includes a reception unit, a measurement unit, and a first notification unit. The receiving unit receives the predetermined signal. The measurement unit measures the position of the mobile station with the reception of the predetermined signal. The first notification unit notifies the measurement control device of the position of the mobile station measured by the measurement unit. The measurement control apparatus further includes a request unit. The request unit requests a radio quality notification to the mobile station selected according to the location notification by the first notification unit. The mobile station further includes a second notification unit that notifies the measurement control apparatus of the wireless quality in response to the request.

  According to one aspect of the measurement system disclosed in the present application, it is possible to measure radio quality even in an area where there is no mobile station connected to the network.

FIG. 1 is a diagram illustrating a configuration of a wireless quality measurement system. FIG. 2 is a diagram illustrating a functional configuration of the MME. FIG. 3 is a diagram illustrating a functional configuration of the base station. FIG. 4 is a diagram illustrating a functional configuration of the mobile station. FIG. 5 is a diagram illustrating a hardware configuration of the MME. FIG. 6 is a diagram illustrating a hardware configuration of the mobile station. FIG. 7 is a sequence diagram for explaining the operation of the wireless quality measurement system according to the first embodiment. FIG. 8 is a diagram illustrating the format of the paging signal according to the first embodiment. FIG. 9 is a sequence diagram for explaining the radio quality measurement process. FIG. 10 is a sequence diagram for explaining the operation of the wireless quality measurement system according to the second embodiment. FIG. 11 is a diagram illustrating the format of the paging signal according to the second embodiment.

  Hereinafter, embodiments of a measurement system, a measurement control apparatus, and a measurement method disclosed in the present application will be described in detail with reference to the drawings. The measurement system, the measurement control device, and the measurement method disclosed in the present application are not limited by the following embodiments.

  The configuration of a wireless quality measurement system according to an embodiment disclosed in the present application will be described below. The wireless quality measurement system is a wireless communication system to which LTE is applied as a wireless communication method. FIG. 1 is a diagram showing a configuration of the wireless quality measurement system 1. As shown in FIG. 1, the wireless quality measurement system 1 includes an MME 10, base stations 20, 30, 40, and mobile stations 50, 60, 70, 80, 90. In the wireless quality measurement system 1, the MME 10 and the base stations 20, 30, and 40 are connected by wire so that various signals and data can be transmitted and received. In addition, the base stations 20, 30, 40 and the mobile stations 50, 60, 70 are connected to each other by wireless lines so that various signals and data can be transmitted and received.

  The MME 10 is installed on the core network as a host device of the base stations 20, 30 and 40. The MME 10 manages the radio quality between the mobile station and the base station for each area and notifies the higher data center. Note that the MME 10 may be integrated with a data center (not shown). The mobile station 50 is located in the cell C1 formed by the base station 20. The mobile station 60 is located in the cell C2 formed by the base station 30. The mobile station 70 is located in the cell C3 formed by the base station 40. Each mobile station 50, 60, 70 performs wireless communication with each base station 20, 30, 40 that forms a cell in the area. On the other hand, the mobile station 80 is located in a communication area where the cells C1 and C2 overlap, but currently does not perform wireless communication with the base stations 20, 30, and 40. Similarly, the mobile station 90 is located in a communication area where the cells C1 and C3 overlap, but currently does not perform wireless communication with the base stations 20, 30, and 40.

  Although details will be described later, the wireless quality measurement system 1 is connected to the network by transmitting a paging signal to the mobile stations 80 and 90 located in the area R within the distance d1 from the measurement target point P. Even in an area R where no mobile station exists, the wireless quality can be measured.

  FIG. 2 is a diagram illustrating a functional configuration of the MME 10. As shown in FIG. 2, the MME 10 includes a data center IF unit 11, an area quality management unit 12, a mobile station selection unit 13, a paging signal transmission unit 14, and a base station IF unit 15. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.

  The data center IF unit 11 is connected to the data center 100 and transmits and receives various control signals. The area quality management unit 12 collects and manages area quality information, and sends a quality information request signal to the mobile stations 80 and 90, for example. For example, the mobile station selection unit 13 determines the position of each mobile station 80, 90 based on the Paging Response signal transmitted from the mobile stations 80, 90, and is optimal for measuring the radio quality at the measurement target point P. The correct mobile station. The paging signal transmission unit 14 calls, for example, the mobile stations 80 and 90 by transmitting a paging signal (calling signal) for designating the position of the measurement target point P and the distance d1 from the position. The base station IF unit 15 is connected to the base stations 20, 30, and 40, and transmits and receives various control signals. In the description of this embodiment, the paging signal is an example of a radio signal transmitted from the base station to the mobile station. Therefore, the base station may acquire position information and / or quality information from the mobile station using not only the paging signal but also other radio signals transmitted from the base station to the mobile station.

  FIG. 3 is a diagram illustrating a functional configuration of the base station 30. As illustrated in FIG. 3, the base station 30 includes an HWY (HighWaY) unit 31, a control unit 32, a BB (Base Band) unit 33, and a wireless IF (Inter Face) unit 34. Each of these components is connected so that signals and data can be input and output in one direction or in both directions.

  The HWY unit 31 is connected to the peripheral base stations 30 and 40 via the MME 10 and S-GW (Serving-Gateway) on the core network, and transmits and receives various control signals and user data. The control unit 32 further includes an S1AP signal processing unit 321, a paging editing unit 322, and an RRC (Radio Resource Control) signal transmission / reception unit 323. When receiving a paging signal from the MME 10 using the S1AP (S1 Application Protocol), the S1AP signal processing unit 321 notifies the paging editing unit 322 of the reception of the paging signal. The paging editing unit 322 edits the paging signal input from the S1AP signal processing unit 321 and generates a paging signal that can be controlled by RRC. The RRC signal transmission / reception unit 323 executes RRC signal processing with the mobile stations 60, 80, 90, for example. The RRC signal transmission / reception unit 323 processes a Paging Response signal, a signal for U-Plane connection, a radio quality measurement signal, and the like.

  The BB unit 33 includes a MAC unit 331, a paging signal processing unit 332, and a control signal processing unit 333. The MAC unit 331 performs signal processing in a MAC (Media Access Control) layer. The paging signal processing unit 332 transmits the paging signal generated by the paging editing unit 322 on a PCH (Paging CHannel). The control signal processing unit 333 performs transmission / reception of control signals via, for example, DL (DownLink) / UL (UpLink) -SCH (Shared CHannel) with the mobile stations 60, 80, 90. For example, the wireless IF unit 34 connects a wireless line to the mobile station 80.

  FIG. 4 is a diagram illustrating a functional configuration of the mobile station 80. As illustrated in FIG. 4, the mobile station 80 includes a control unit 81, a BB unit 82, a radio unit 83, and a position measurement unit 84. Each of these components is connected so that signals and data can be input and output in one direction or in both directions. The control unit 81 further includes a position determination unit 811, a wireless quality notification unit 812, a wireless quality storage unit 813, and a position information storage unit 814.

  The position determination unit 811 manages the current position of the mobile station 80 and determines whether or not the mobile station 80 is located within the area specified by the paging signal from the MME 10. The radio quality notifying unit 812 manages the radio quality information input from the radio unit 83 and returns a radio quality measurement result to the radio quality measurement request from the MME 10. The wireless quality storage unit 813 stores the measurement result of the wireless quality by the wireless unit 83. The location information storage unit 814 stores the current location information of the mobile station 80 measured by the location measurement unit 84. The BB unit 82 performs baseband processing. The radio unit 83 transmits and receives radio signals, and measures the quality of the radio channel between the mobile station 80 and the base station 30, for example. The position measuring unit 84 receives the GPS signal and measures the current position of the mobile station 80.

  Subsequently, hardware configurations of the MME 10 and the mobile station 80 will be described. FIG. 5 is a diagram illustrating a hardware configuration of the MME 10. As shown in FIG. 5, in the MME 10, a CPU (Central Processing Unit) 10b, a memory 10c such as an SDRAM (Synchronous Dynamic Random Access Memory), an HDD (Hard Disk Drive) 10d, and an NIC (Network Interface Card) 10e. Are connected so that various signals and data can be input and output via the switch 10a.

  Regarding the correspondence with the functional components of the MME 10, the data center IF unit 11 and the base station IF unit 15 are realized by, for example, the NIC 10e and the memory 10c. The area quality management unit 12 is realized by, for example, the CPU 10b, the memory 10c, and the HDD 10d. The mobile station selection unit 13 is realized by, for example, the CPU 10b and the memory 10c. The paging signal transmission unit 14 is realized by, for example, the NIC 10e, the CPU 10b, and the memory 10c.

  FIG. 6 is a diagram illustrating a hardware configuration of the mobile station 80. As shown in FIG. 6, in the mobile station 80, a CPU 80b, a memory 80c, a display 80d, a DSP (Digital Signal Processor) 80e, an RF (Radio Frequency) circuit 80f, and a GPS sensor 80g are connected to a switch 80a. Are connected so that various signals and data can be input and output. The RF circuit 80f has an antenna A.

  Regarding the correspondence with the functional components of the mobile station 80, the position determination unit 811 and the radio quality notification unit 812 are realized by, for example, the CPU 80b and the memory 80c. The wireless quality storage unit 813 and the location information storage unit 814 are realized by the memory 80c, for example. The BB unit 82 is realized by, for example, the DSP 80e and the memory 80c. The radio unit 83 is realized by, for example, the RF circuit 80f. The position measurement unit 84 is realized by, for example, the GPS sensor 80g and the DSP 80e.

  The configuration of the base station 30 has been described above representatively, but the configurations of the other base stations 20 and 40 are the same as the configuration of the base station 30. Accordingly, common constituent elements are denoted by the same reference numerals at the end, and illustration and detailed description thereof are omitted. Similarly, in the above description of the mobile station, the configuration of the mobile station 80 is representatively described. However, the configurations of the other mobile stations 50, 60, 70, and 90 are the same as the configuration of the mobile station 80. Accordingly, common constituent elements are denoted by the same reference numerals at the end, and illustration and detailed description thereof are omitted.

  Next, the operation of the wireless quality measurement system 1 in the first embodiment will be described.

  In S1, the paging signal transmission unit 14 of the MME 10 transmits a paging signal to a base station (for example, the base station 30) around the position (x, y) triggered by the notification of the measurement target point P from the data center 100. To do. Since the mobile station 80 is located in the cell C2 formed by the base station 30, the mobile station 80 receives the paging signal transmitted from the base station 30 by PCH (Paging CHannel) (S2).

  The paging signal transmitted and received in S1 and S2 is a signal for calling a mobile station near the position (x, y) indicating the measurement target point P. FIG. 8 is a diagram illustrating the format F1 of the paging signal according to the first embodiment. As shown in FIG. 8, the format F1 has areas for storing data of message type, paging cause, domain type, position information (x, y), and distance d1. The message type is a code indicating that the signal is a paging signal. In the paging cause, for example, “voice incoming”, “mail incoming” or the like is set as the reason why the paging signal is transmitted. In this embodiment, since the paging signal is transmitted to measure the radio quality at the measurement target point P, “radio quality measurement” is set in the paging cause.

  The domain type is information indicating which domain the paging signal belongs to is a CS (Circuit Switched) domain or a PS (Packet Switched) domain. In this embodiment, since the paging signal is distributed by packet communication, “PS” is set as the domain type.

  Further, as the parameters of the paging signal, position information (x, y) of the point P where the data center 100 desires to measure radio quality and a distance d1 from the position are set. In addition, since the conventional paging signal is transmitted to a specific mobile station, the paging signal includes, for example, IMSI (International Mobile Subscriber Identity), TMSI (Temporary Mobile Subscriber Identity) as the ID of the destination mobile station. ), P-TMSI (Packet-TMSI), and the like. However, in this embodiment, since the paging signal is distributed to an unspecified mobile station, as shown in FIG. 8, the mobile station ID is not stored in the paging signal.

  The same processing as S1 and S2 is also executed between the MME 10 and the mobile station 90. That is, when the HWY unit 31 of the base station 30 receives the paging signal from the MME 10, the radio IF unit 34 of the base station 30 transmits the paging signal to an unspecified mobile station by PCH. The mobile station 90 receives the paging signal transmitted from the base station 30 (S3).

  The position determination unit 811 of the mobile station 80 refers to the paging cause of the paging signal received in S2, and confirms whether the call by the paging signal is a call to an unspecified mobile station. When it is confirmed that the call is to an unspecified terminal, the position determination unit 811 extracts position information (x, y) and a distance d1 from the paging signal (S4). Regarding the confirmation, as described above, the paging signal may explicitly indicate that it is a call to an unspecified terminal by the paging cause, but the position determination unit 811 includes the mobile station ID in the paging signal. The above confirmation may be performed by not having been set.

  In S5, the position measurement unit 84 of the mobile station 80 measures the current position (m, n) of the mobile station 80 based on the information acquired from the GPS sensor 80g. Note that the current position (m, n) of the mobile station 80 may be measured by trigonometry or the like using broadcast information from the base stations 20, 30, 40. In S6, the position determination unit 811 of the mobile station 80 determines the position indicated by the position information (x, y) extracted from the paging signal in S4 and the position (m, n) of the mobile station 80 measured in S5. The distance d2 is calculated. Next, the position determination unit 811 determines whether the distance d2 calculated in S6 is equal to or less than the distance d1 extracted from the paging signal in S4. In other words, the mobile station 80 is located at a distance d1 from the measurement target point P. It is determined whether or not it is located within the range (S7).

  The series of processes of S4 to S7 described above are similarly executed in the mobile station 90 that similarly receives the paging signal from the base station 30 (S8 to S11). Thereby, it is determined whether or not the current position (o, p) of the mobile station 90 is within the distance d1 from the position (x, y) of the measurement target point P specified by the paging signal.

  The value of the distance d1 can be appropriately set according to the capacity of the system and the wireless channel, or the positional relationship between the measurement target point P and each of the base stations 20, 30, and 40. The value of the distance d1 can be appropriately updated according to the required quality measurement accuracy or the density of mobile station users in the vicinity of the measurement target point P. For example, the distance d1 is about several m to several hundred m. is there.

  As a result of the determination in S7, when the own mobile station 80 is located within the range of the distance d1 (S7; Yes), the radio unit 83 of the mobile station 80 transmits an RRC to the base station 30 that is the source of the paging signal. Connect. Next, the radio unit 83 sets the current position (m, n) of the mobile station 80 calculated in S6 and the distance d2 in Paging Response (NAS: Service Request), and transmits it to the base station 30. (S12). If the result of the determination in S7 is that the mobile station 80 is not located within the range of the distance d1 (S7; No), the mobile station 80 continues to perform the paging signal without executing the processing from S12 onward. Wait for receipt of.

  When receiving the Paging Response from the mobile station 80, the wireless IF unit 34 of the base station 30 transfers the Paging Response to the MME 10 (S13). The same processing as S12 and S13 is also executed between the mobile station 90 and the MME 10. That is, as a result of the determination in S11, when it is confirmed that the mobile station 90 is located within the range of the distance d1 (S11; Yes), the mobile station 90 determines the current position information (o, p) of the own station and A Paging Response including the distance d3 is returned to the base station 30 (S14). When receiving the Paging Response from the mobile station 90, the wireless IF unit 34 of the base station 30 transfers the Paging Response to the MME 10 (S15).

  In S16, the mobile station selection unit 13 of the MME 10 selects a mobile station that requests measurement of radio quality. That is, the mobile station selection unit 13 selects the distance (for example, distances d2 and d3) from the position (x, y) of the measurement target point P from the mobile stations (for example, mobile stations 80 and 90) that have returned Paging Response. ) Selects the mobile station that takes the minimum value. Referring to FIG. 1 again, in this embodiment, the position (m, n) of the mobile station 80 is closer to the position (x, y) than the position (o, p) of the mobile station 90. The mobile station 80 is selected as the mobile station that measures the radio quality.

  Accordingly, the base station IF unit 15 of the MME 10 transmits a U-Plane connection request addressed to the mobile station 80 to the base station 30 in order to establish a line connection with the mobile station 80 (S17). When receiving the U-Plane connection request by the HWY unit 21, the base station 30 transfers the U-Plane connection request to the mobile station 80 (S18).

  On the other hand, in S <b> 19, the base station IF unit 15 of the MME 10 transmits a connection rejection signal destined for the mobile station 80 to the base station 30 in order to reject the connection with the unselected mobile station 90. This connection refusal signal is a signal transmitted as a response to the Paging Response transmitted by the mobile station 90 in S14, and the BB unit 92 of the mobile station 90 receives the signal, so that the local station and the MME 10 communicate with each other. It is detected that the connection is rejected (S20).

  The MME 10 acquires the radio quality information at the current position (m, n) of the mobile station 80 from the mobile station 80 by connection with the mobile station 80 via the base station 30. FIG. 9 is a sequence diagram for explaining the radio quality measurement process. When a radio link is established between the mobile station 80 and the base station 30 by the U-Plane connection request in S18 shown in FIG. 7 (during communication in S21), the base station IF unit 15 of the MME 10 A radio quality measurement request signal is transmitted to 30 (S22). When the base station 30 receives the radio quality measurement request signal by the HWY unit 31, the radio IF unit 34 transmits the signal as a measurement request to the mobile station 80 (S23). The mobile station 80 that has received the measurement request returns a measurement report including the radio quality information of the position (m, n) to the base station 30 through the radio quality notification unit 812 (S24). The HWY unit 31 of the base station 30 transmits a radio quality response signal to the MME 10 as a response to the measurement request received in S22 (S25).

  The radio unit 83 of the mobile station 80 starts measurement of radio quality triggered by the reception of the measurement request. The radio quality measurement method is a well-known and commonly used technique, and thus detailed description thereof is omitted. However, the radio unit 83 uses, for example, diversity technology to measure the radio field intensity (from the plurality of base stations 20, 30, 40). For example, RSSI (Received Signal Strength Indication) and reception level (for example, CQI: Channel Quality Indicator) are measured.

  The measurement result of the radio quality is notified to the data center 100 via the base station 30 and the MME 10 as radio quality information such as RSRP (Reference Signal Received Power) and RSRQ (Reference Signal Received Quality). In the DB (DataBase) of the data center 100, the wireless quality information of each point is stored in association with the position information, and the wireless quality information in the area R is notified by the notification of the wireless quality information from the mobile station 80. Will be newly registered in the DB. This makes it possible to create an area quality map including an area where there is no mobile station connected to the network by using, for example, mail, telephone, or the Internet.

  As described above, the wireless quality measurement system 1 according to the first embodiment includes the MME 10 and the mobile stations 80 and 90 that can communicate with the MME 10. The MME 10 includes a paging signal transmission unit 14 that transmits a predetermined signal (for example, a paging signal). The mobile stations 80 and 90 have radio units 83 and 93 and position measuring units 84 and 94. The radio units 83 and 93 receive the predetermined signal. The position measuring units 84 and 94 measure the positions (m, n) and (o, p) of the mobile stations 80 and 90, respectively, with the reception of the predetermined signal. The radio units 83 and 93 notify the MME 10 of the positions of the mobile stations 80 and 90 measured by the position measuring units 84 and 94, respectively. The MME 10 includes a mobile station selection unit 13 and a base station IF unit 15. The mobile station selection unit 13 selects a mobile station (for example, the mobile station 80) whose position notified by the radio units 83 and 93 is closest to the position (x, y) to be measured for radio quality. The base station IF unit 15 requests the mobile station 80 selected by the mobile station selection unit 13 to notify the radio quality. The mobile station 80 has a wireless quality notification unit 812. The radio quality notification unit 812 notifies the MME 10 of the radio quality in response to the request. The base station IF unit 15 receives the radio quality information notified from the mobile station 80. Thereby, the wireless quality measurement system 1 can measure the wireless quality even in the area R where there is no mobile station connected to the network (for example, the mobile stations 50, 60, and 70 in FIG. 1).

  The mobile stations 80 and 90 preferably have position determination units 811 and 911, respectively. The position determination units 811 and 911 receive the position (x, y) that is the measurement target of the wireless quality and the positions (m, n) and (o) of the mobile stations 80 and 90 measured by the position measurement units 84 and 94, respectively. , P), distances d2 and d3 are calculated respectively. In addition, the radio units 83 and 93 determine the positions of the mobile stations 80 and 90 measured by the position measurement units 84 and 94 when the distances d2 and d3 calculated by the position determination units 811 and 911 are equal to or less than the predetermined distance d1. (M, n) and (o, p) are respectively notified to the MME 10. In addition, the radio units 83 and 93 notify the MME 10 of the distances d2 and d3 calculated by the position determination units 811 and 911, respectively.

  The predetermined signal may include information indicating the position (x, y) to be measured for the wireless quality and the predetermined distance d1 instead of the identification information of the mobile stations 80 and 90. . In this way, the MME 10 can set parameters on the network side without adding a mobile station ID by adding parameters of position (x, y) and distance d1 to the predetermined signal. And

  The wireless quality measurement system 1 is, for example, when there is a point where collection of wireless quality information is missing in the area quality map, and the administrator of the data center 100 wants to measure the wireless quality at the above point in a complementary manner. Is particularly preferred. Further, the MME 10 specifies the distance d1 from the position (x, y), thereby filtering the mobile station that returns a Paging Response to the paging signal. This prevents an excessively large number of Paging Responses from being transmitted from the mobile station and suppresses the network load.

  Next, Example 2 will be described. The configuration of the wireless quality measurement system in the second embodiment is the same as the configuration of the wireless quality measurement system 1 in the first embodiment shown in FIG. Therefore, common components are denoted by the same reference numerals, and illustrations and detailed descriptions thereof are omitted. The difference between the second embodiment and the first embodiment is the presence or absence of filtering based on the distance d1. That is, in the first embodiment, only the mobile stations that are located within the distance d1 among the mobile stations that have received the paging signal return the Paging Response. On the other hand, in Example 2, all the mobile stations that have received the paging signal return a Paging Response to the MME 10. Hereinafter, the operation of the wireless quality measurement system 1 according to the second embodiment will be described with a focus on differences from the first embodiment with reference to FIGS. 10 and 11.

  FIG. 10 is a sequence diagram for explaining the operation of the wireless quality measurement system 1 according to the second embodiment. FIG. 10 includes the same processing as FIG. 7 referred to in the description of the operation according to the first embodiment. Therefore, common steps are denoted by the same reference numerals at the end and detailed description thereof is omitted. . Specifically, steps T1 to T3, T5, T9, and T12 to T20 in FIG. 10 respectively correspond to steps S1 to S3, S5, S9, and S12 to S20 shown in FIG.

  In T1 to T3, a paging signal is transmitted and received between the MME 10 and the mobile stations 80 and 90. FIG. 11 is a diagram illustrating the format F2 of the paging signal according to the second embodiment. As shown in FIG. 11, the configuration of the format F2 is the same as the configuration of the format F1 according to the first embodiment described above except that the position information (x, y) and the distance d1 are not stored. That is, the format F2 has areas for storing data of message type, paging cause, and domain type. The message type is a code indicating that the signal is a paging signal. In the paging cause, “radio quality measurement” is set as the reason why the paging signal is transmitted. Also, “PS” is set as the domain type.

  At T16, the mobile station selection unit 13 of the MME 10 selects a mobile station that is a request target for radio quality measurement. Specifically, the mobile station selection unit 13 compares the distances from the position (x, y) of the measurement target point P between the mobile stations, and selects the mobile station having the minimum value for the position (x, y). Select the mobile station closest to y). In this embodiment, regardless of the distance from the position (x, y), the MME 10 receives the Paging Response from all the mobile stations (for example, the mobile stations 50, 60, 70, 80, 90) that have received the paging signal. You will receive a reply. Referring to FIG. 1 again, in this embodiment, since the mobile station 80 is the closest to the position (x, y) among the mobile stations 50, 60, 70, 80, 90, the mobile station that measures the radio quality. Selected as.

  In the second embodiment, the wireless quality measurement system 1 also performs the same wireless quality measurement process (see FIG. 9) as that of the first embodiment for the mobile station 80 selected in T16.

  As described above, in the wireless quality measurement system 1 according to the second embodiment, it is determined whether or not the mobile stations 80 and 90 that have received the paging signal are located within the distance d1 from the position (x, y). Omitted. In such an aspect, the mobile stations 80 and 90 return a Paging Response unconditionally upon reception of a paging signal. Therefore, when selecting a mobile station, the MME 10 calculates the distance of each mobile station from the position (x, y).

  According to the wireless quality measurement system 1 according to the second embodiment, the mobile stations that respond to the Paging Response are not narrowed down. Then, the mobile station that is closest to the measurement target point P among the mobile stations that responded with Paging Response is selected as the mobile station that is optimal for the measurement of the radio quality. Thereby, it is possible to cope with a case where there is no mobile station capable of wireless communication in the vicinity of the measurement target point P.

  In the first embodiment, the MME 10 designates the distance d1 by the paging signal. However, it is assumed that there is no mobile station within the distance d1 from the position (x, y). In such a case, the paging signal transmission unit 14 of the MME 10 periodically transmits a paging signal every predetermined time (for example, several seconds to several tens of minutes), and any mobile station enters the above range. It is good also as what waits. Alternatively, on the contrary, when the mobile station 80 is not located within the range, the mobile station 80 may monitor the presence / absence of entering the range every predetermined time (for example, several seconds to several tens of minutes). Good. In this case, the mobile station 80 transmits a Paging Response to the MME 10 when the mobile station 80 detects that the mobile station 80 has entered. Thereby, even when the mobile station does not exist within the above range at the time of transmission of the paging signal, it is possible to measure the radio quality for the position (x, y).

  Moreover, in the said Example 1, MME10 shall set the distance d1 from a position (x, y) fixedly. However, the present invention is not limited to this mode, and the MME 10 may variably set the distance d1. That is, when there is no mobile station within the distance d1 from the position (x, y), the paging signal transmission unit 14 of the MME 10 newly sets a distance d1 ′ longer than the distance d1 in the paging signal. And may be transmitted. If the mobile station does not exist within the distance d1 ′ from the position (x, y) even if the distance d1 is increased, the paging signal transmission unit 14 of the MME 10 adds a longer distance to the paging signal. d1 ″ may be set and transmitted. In this way, the MME 10 gradually increases the distance d1 from the position (x, y), and the mobile station exists within the above range. At this point, a Paging Response is received from the mobile station, which makes it possible to reduce the number of mobile stations that transmit the Paging Response. An increase in network load is avoided.

  Further, in any of the above embodiments, the MME 10 selects the mobile station closest to the position (x, y) of the measurement target point P as the mobile station with the best measurement conditions (S16 in FIG. T16 in FIG. 10). However, the present invention is not limited to this mode, and when there are a plurality of mobile stations that return a Paging Response, the MME 10 may select a plurality of mobile stations from the plurality of mobile stations. For example, when receiving a Paging Response reply from 10 mobile stations, the mobile station selection unit 13 of the MME 10 selects the top three mobile stations in order from the mobile station with the shortest distance from the position (x, y). The wireless quality measurement result (radio quality information) is acquired from any of these mobile stations. At this time, the area quality management unit 12 of the MME 10 calculates the average value of the radio quality information received from each mobile station, and reports the average value to the data center 100 as the radio quality at the measurement target point P. For example, in the first and second embodiments, each mobile station 80 and 90 returns a paging response to the paging signal to the MME 10, so that the MME 10 obtains the average of the radio quality information acquired from both mobile stations 80 and 90. The value is reported to the data center 100. Thereby, even when the mobile station closest to the position (x, y) of the measurement target point P does not exist in the vicinity of the position (x, y), it is possible to accurately measure the radio quality.

  In each of the above embodiments, the mobile stations 80 and 90 have been described on the assumption that they are not connected to the network. However, it is sufficient that at least the paging signal can be received. For example, even when the power saving mode or wireless LAN (Local Area Network) function is off, the mobile station is powered on and can receive signals from the mobile phone network. If so, the present invention can be applied.

  In each of the above embodiments, 3GPP LTE has been described as a wireless communication method, but the wireless quality measurement system 1 can also be applied to W-CDMA. In W-CDMA, the radio quality measurement system 1 uses Received Signal Code Power (RSCP) as radio quality information that replaces RSRP, and CPICH_Ec / No (Common PIlot CHannel Energy per chip to Noise) as radio quality information that replaces RSRQ. By using (ratio), it is possible to cope with the measurement technique described above. In each of the above-described embodiments, the mobile stations 80 and 90 are assumed to be wireless communication terminals such as a mobile phone, a smartphone, and a PDA (Personal Digital Assistant). However, the present invention is not limited to the mobile station, and positioning is possible. The present invention can be applied to various communication devices having both functions and wireless quality measurement functions.

  Furthermore, each component of the wireless quality measurement system 1 does not necessarily need to be physically configured as illustrated. That is, the specific mode of distribution / integration of each device is not limited to the illustrated one, and all or a part thereof is functionally or physically distributed in an arbitrary unit according to various loads or usage conditions. -It can also be integrated and configured. For example, the paging signal transmission unit 14 and the base station IF unit 15 of the MME 10 or the position measurement unit 84 and the position determination unit 811 of the mobile station 80 may be integrated as one component. On the contrary, regarding the radio unit 83 of the mobile station 80, it may be distributed into a part for receiving a paging signal and a part for notifying the MME 10 of the position of its own station. Further, regarding the position determination unit 811, a part for extracting the position information (x, y) and the distance d 1 from the paging signal, and whether or not the own station is located within the distance d 1 from the measurement target point P You may distribute to the part which performs. Further, the memory 10c and the memory 80c may be connected as an external device of the MME 10 and the mobile station 80 via a network or a cable, respectively.

  In each of the above embodiments, the MME 10 has the functions of the measurement control device (for example, the paging signal transmission unit 14 and the base station IF unit 15). However, the base stations 20, 30, and 40 are the same in place of the MME 10. It is good also as what has the function of. In any of these aspects, the mobile station selection unit 13 may be mounted on the MME 10 or may be mounted on at least one of the base stations 20, 30, and 40.

1 Wireless quality measurement system 10 MME
10a Switch 10b CPU (Central Processing Unit)
10c Memory 10d HDD (Hard Disk Drive)
10e NIC (Network Interface Card)
DESCRIPTION OF SYMBOLS 11 Data center IF part 12 Area quality management part 13 Mobile station selection part 14 Paging signal transmission part 15 Base station IF part 20, 30, 40 Base station 31 HWY (HighWaY) part 32 Control part 33 BB (Base Band) part 34 Wireless IF (Inter Face) section 50, 60, 70, 80, 90 Mobile station 80a Switch 80b CPU
80c Memory 80d Display 80e DSP (Digital Signal Processor)
80f RF (Radio Frequency) circuit 80g GPS (Global Positioning System) sensor 81 Control unit 82 BB unit 83 Wireless unit 84 Position measurement unit 100 Data center 321 S1AP signal processing unit 322 Paging editing unit 323 RRC (Radio Resource Control) signal transmission / reception unit 331 MAC unit 332 Paging signal processing unit 333 Control signal processing unit 811 Location determination unit 812 Radio quality notification unit 813 Radio quality storage unit 814 Location information storage unit A Antenna C1, C2, C3 Cell F1, F2 Paging signal format P (x , Y) Measurement target point R Area where no connected mobile station exists

Claims (6)

A measurement system having a measurement control device and a mobile station capable of communicating with the measurement control device,
The measurement control device includes:
A transmission unit for transmitting a predetermined signal;
The mobile station
A receiving unit for receiving the predetermined signal;
With the reception of the predetermined signal, a measurement unit that measures the position of the mobile station;
A first notification unit that notifies the measurement control device of the position of the mobile station measured by the measurement unit;
The measurement control device includes:
A request unit for requesting notification of radio quality to the mobile station selected in accordance with the location notification by the first notification unit;
The mobile station
In response to the request, to have a second notification unit configured to notify the radio quality in the measurement control device,
The measurement system according to claim 1, wherein the mobile station is a mobile station that is not connected to a network and is capable of receiving a signal from a mobile phone network . The mobile station
A calculation unit that calculates a distance between a position to be measured for wireless quality and a position of the mobile station measured by the measurement unit;
When the distance calculated by the calculation unit is equal to or less than a predetermined distance, the first notification unit, in addition to the position of the mobile station measured by the measurement unit, the distance calculated by the calculation unit, The measurement system according to claim 1, wherein the measurement control device is notified.   The measurement system according to claim 2, wherein the predetermined signal includes information indicating a position to be measured for the wireless quality and the predetermined distance. A transmission unit for transmitting a predetermined signal;
The mobile station selected based on the position notified from the mobile station upon reception of the predetermined signal is requested to notify the radio quality, and the radio quality notified from the mobile station in response to the request have a a receiving unit that receives the information,
The measurement control apparatus , wherein the mobile station is a mobile station that is not connected to a network and is capable of receiving a signal from a mobile phone network . The measurement control device transmits a predetermined signal,
The mobile station
Receiving the predetermined signal;
With the reception of the predetermined signal, measure the position of the mobile station,
Notifying the measurement control device of the measured position of the mobile station,
The measurement control device is
Requesting radio quality notification to the mobile station selected in response to the location notification,
The mobile station is
In response to the request, notifies the measurement control device of the wireless quality ,
The measurement method according to claim 1, wherein the mobile station is a mobile station that is not connected to a network and is in a state capable of receiving a signal from a mobile phone network . The predetermined signal includes information indicating the position to be measured for the wireless quality and the predetermined distance instead of the identification information of the mobile station,
The measurement system according to claim 3, wherein the transmission unit of the measurement control apparatus adds each parameter of the position to be measured for the wireless quality and the predetermined distance to the predetermined signal.

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