JP4004926B2 - Mobile terminal identification information collecting device and required time information collecting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile terminal identification information collecting apparatus and a required time information totaling apparatus in a system that provides traffic information and the like.
[0002]
[Prior art]
Systems have already been developed that monitor the actual movement of people and means of transportation and estimate the time required to reach the destination. According to such a system, the estimated required time can be individually notified to each person or each means of transportation, or the estimated required time can be posted on a bulletin board or broadcast. For example, in such a conventional system, an in-vehicle device that can be transmitted and received in real time with the center device is mounted on a mobile body, the vehicle number from the in-vehicle device to the center device, information on points (stops, etc.) that become points, arrival or departure There is one that transmits passage information such as the time of day in real time. The center device creates data such as the estimated required time from the information transmitted from the in-vehicle device, and provides it to a mobile phone terminal or the like via the Internet. (For example, see Patent Document 1)
[0003]
In addition, a traffic information management device has been developed that includes a camera that captures a passing vehicle and can detect features such as the size and color of the vehicle. By installing such a traffic information management device at a plurality of points on the road, travel time information between the devices of the same vehicle can be obtained. Based on the obtained travel time, the arrival time at each point of the specific vehicle is predicted. (For example, see Patent Document 2)
[0004]
[Patent Document 1]
JP 2001-331895 A
[Patent Document 2]
JP 2000-353290 A
[0005]
[Problems to be solved by the invention]
A conventional system that requires a dedicated device to be mounted on a moving body has a problem that it cannot be sufficiently spread without a merit for the user to install the device.
[0006]
In addition, there is a problem that a traffic information management apparatus using a camera image for information collection may infringe on the privacy of the user.
[0007]
The present invention has been made to solve the above-described problems, and collects location information of a mobile terminal without mounting a special device on the mobile terminal and without impairing the privacy of the mobile terminal user. An object is to obtain a mobile terminal identification information collecting apparatus.
[0008]
Another object of the present invention is to obtain a required time information totaling device that provides traffic statistics information such as time required for each time zone from the obtained location information of a mobile terminal.
[0009]
[Means for Solving the Problems]
The mobile terminal identification information collecting apparatus according to the present invention monitors an IP packet transmitted from a mobile terminal accessing a communication network through a radio base station, IP datagram reconstructed from IP packets transmitted from the same mobile terminal to the same destination, and reconstructed IP datagram A mobile terminal information extraction unit that extracts identification information of the mobile terminal from Mobile terminal Identification information together with IP packet detection time and radio base station identification information , Calculate the estimated time required to move the mobile terminal between radio base stations And a mobile terminal information transmitting unit that transmits to the required time information totaling device.
[0010]
The required time information totaling apparatus according to the present invention is a mobile terminal identification information extracted from an IP packet from a mobile terminal identification information collecting apparatus that monitors an IP packet transmitted from a mobile terminal accessing a communication network through a radio base station. Mobile terminal information receiving unit that receives the IP packet detection time and the identification information of the radio base station, Based on the information received by the mobile terminal information receiving unit, a time difference when the mobile terminal passes through the radio base station is calculated, and a time difference greater than a predetermined value determined in advance is calculated from the calculated time difference. Based on the calculated time required for the instantaneous section, Mobile terminal wireless Necessary for moving between base stations Do section prediction And a calculation unit for calculating the required time.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, various embodiments of the present invention will be described.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of a traffic information providing system including a mobile terminal identification information collecting apparatus and a required time information totaling apparatus according to Embodiment 1 of the present invention. As shown in the figure, the traffic information providing system includes an unspecified number of mobile terminals, a plurality of base stations, and a totaling station. FIG. 1 illustrates mobile terminals 110 and 210 and base stations 100 and 200 among a large number of mobile terminals and a plurality of base stations.
[0012]
When the mobile terminals 110 and 210 use various services provided on the network, such as World Wide Web and automatic toll charging service, etc., such as a wireless LAN or a narrow-range wireless communication means (DSRC: Dedicated Short Range Communication) A mobile terminal having a function of accessing an IP communication network through a local communication means. For example, an in-vehicle navigation device having a function of communicating with a roadside communication network by DSRC, a laptop computer equipped with a wireless LAN communication card or a mobile terminal compliant with PDA (Personal Digital Assistants), or a wireless LAN interface or a Bluetooth interface Mobile phone equipped. The mobile terminals 110 and 210 may have a communication function using Mobile IP in compliance with IPv4 or IPv6, or may comply with DHCP (Dynamic Host Configuration Protocol). The mobile terminals 110 and 210 have such an access function to the IP communication network and various known communication functions, but no special function is required for the mobile terminal for the present invention.
[0013]
The base stations 100 and 200 are provided with roadside devices 120 and 220, packet monitoring devices 130 and 230 (mobile terminal identification information collection devices), base station servers 140 and 240, and network servers 160 and 260, respectively. Roadside devices, packet monitoring devices, base station servers, and network servers in each base station are connected to each other via Ethernet (registered trademark) 190 or 290.
[0014]
As will be described later, the roadside devices 120 and 220 can communicate with the mobile terminals existing in the areas in charge of the base stations 100 and 200 using IP packets. The roadside devices 120 and 220 send the IP packets transmitted from the mobile terminals 110 and 210 to the Ethernet (registered trademark) 190 and 290, and the IP packets on the Ethernet (registered trademark) 190 and 290 are transmitted to the packet monitoring device 130, 230 captures and analyzes and identifies mobile terminal identification information (eg, IP address) in the IP packet. Then, the packet monitoring devices 130 and 230 notify the aggregation station 300 of the mobile terminal identification information regarding each IP packet and the detection time of the IP packet. The packet monitoring devices 130 and 230 can be connected to the modem 360 installed in the totaling station 300 via the modems 180 and 280 and the dedicated line 50, respectively. Alternatively, it can be connected to the router 350 of the counting station 300 through the repeating hubs 170 and 270, the routers 150 and 250, the dedicated line 61, and the virtual private network (VPN) via the Internet 500. In the case of VPN, the cost of a dedicated line can be saved. In the embodiment of FIG. 1, the packet monitoring devices 130 and 230 are installed for each base station. However, as shown in FIG. It may be.
[0015]
The base station servers 140 and 240 provide information to the mobile terminals existing in the areas in charge of the base stations 100 and 200 using IP packets. The provision of such information may be performed by broadcasting to the assigned area, or may be performed individually to the mobile terminal in response to an information provision request from the mobile terminal. As information provided to the mobile terminal, for example, there is a required time to a destination created by the aggregation station 300 described later. The packet monitoring devices 130 and 230 may monitor the IP packet related to the information providing request transmitted from the mobile terminal or the IP packet transmitted from the mobile terminal in response to the broadcast as described above.
[0016]
The network servers 160 and 260 are provided for IP services to mobile terminals existing in the areas in charge of the base stations 100 and 200. For example, the mobile terminals 110 and 210 can exchange information with a fixed terminal 800 or another mobile terminal linked to the Internet 500 using Mobile IP or DHCP. The mobile terminals 110 and 210 can also browse a website by specifying a URL (Uniform Resource Locator) on the Internet 500. The network servers 160 and 260 are connected to the Internet service provider (ISP) network 600 via the router 150 and the dedicated line 61, and relay IP packets to the Internet 500 for exchanging information thereof. Or relay. The packet monitoring devices 130 and 230 may monitor the IP packet transmitted from the mobile terminal for the IP service as described above.
[0017]
The roadside devices 120 and 220 include narrow area wireless communication interfaces 121 and 221 that perform local wireless communication with mobile terminals, processing units 122 and 222, and network communication interfaces 123 and 223, respectively. Here, the network communication interfaces 123 and 223 are Ethernet (registered trademark) interfaces, and are connected to the repeating hubs 170 and 270. The narrow-area wireless communication interfaces 121 and 221 are DSRC or wireless LAN access points, and can communicate with mobile terminals such as mobile terminals 110 and 210 that pass in the vicinity. Both the DSRC and the wireless LAN access point may be juxtaposed on each narrow area wireless communication interface. In this embodiment, IP packet communication is used for communication between the mobile terminal and the roadside device. The processing units 122 and 222 transfer the IP packets from the mobile terminals received by the narrow-area wireless communication interfaces 121 and 221 to the network communication interfaces 123 and 223, and the base station servers 140 and 140 received by the network communication interfaces 123 and 223, respectively. IP packets from 240 or network servers 160 and 260 are transferred to the narrow area wireless communication interfaces 121 and 221. In the illustrated embodiment, one roadside device is provided in one base station, but a plurality of roadside devices may be provided in one base station.
[0018]
FIG. 2 is a block diagram showing a configuration of the packet monitoring apparatus 130 according to the first embodiment of the present invention. Packet monitoring devices (for example, packet monitoring device 230) provided in other base stations also have the same configuration. As shown in the figure, the packet monitoring device 130 includes a calculation unit 31, a communication network interface 32, a line interface 33, a real time clock 35, a display unit 36, a voice output unit 37, an input unit 38, a roadside device interface 39, and a constant table 40. A transmission data log table 41 is provided.
[0019]
The roadside machine interface 39 is connected to a roadside machine in the base station. The arithmetic unit 31 can process the IP packet received from the roadside device via the roadside device interface 39.
The communication network interface 32 is provided for the packet monitoring apparatuses 130 and 230 to perform IP communication via the Internet 500. The communication network interface 32 is, for example, a network interface card (NIC) or the like, and is connected to the repeating hub 170 or 270 (see FIG. 1) by a 100Base-T cable, and the Ethernet (registered trademark) 190 inside the base station 100 or 200 or 290 is connected.
The line interface 33 is provided for the packet monitoring devices 130 and 230 to communicate with the aggregation station 300 via the dedicated line 50.
[0020]
The display unit 36, the audio output unit 37, and the input unit 38 are provided as a man-machine interface between the operator of the base station and the packet monitoring devices 130 and 230. The operator can use these to set the communication environment and filtering conditions of the packet monitoring devices 130 and 230 (conditions for the packet monitoring devices 130 and 230 to extract mobile terminal identification information from the IP packet in the analysis of the IP packet). it can.
[0021]
The constant table 40 and the transmission data log table 41 are stored in a storage device (not shown) provided in the packet monitoring devices 130 and 230. The storage device includes a fixed storage medium such as a nonvolatile random access memory, a read only memory, and a hard disk, and a portable storage medium such as a memory card, a CD-ROM, a DVD (digital versatile disk), and a flexible disk. Though conceivable, in order to update and save the constant table 40 and the transmission data log table 41 as will be described later, the storage device is preferably a rewritable storage medium such as an EPROM, a hard disk, or a flexible disk. Further, although not shown, the packet monitoring device 130 has a volatile memory as a working area of the calculation unit 31.
[0022]
The calculation unit 31 includes a mobile terminal information extraction unit 42, a mobile terminal information transmission unit 43, and a constant table setting unit 44. The operation of the calculation unit 31 will be described in detail later.
[0023]
Returning to FIG. 1, the aggregation station 300 is provided with an aggregation server 310 (required time information aggregation device), a database server 320, an aggregation station client 330, a firewall 340, and a modem 360. The aggregation station 300 may include a router 350. These are interconnected by Ethernet (registered trademark) inside the aggregation station 300. The aggregation server 310 has a personal computer (PC) equipped with a communication network interface such as NIC as in the packet monitoring devices 130 and 230, and uses Ethernet (registered trademark) in the aggregation station 300 using a 100Base-T cable. ) Using a repeating hub or the like. The mobile terminal identification information and the detection time information transmitted from the packet monitoring devices 130 and 230 of the base stations 100 and 200 are received by the aggregation server 310 via the modem 360. The aggregation server 310 calculates the required time based on the mobile terminal identification information and the detection time information.
[0024]
In this embodiment, the calculation result in the aggregation server 310 is stored in a database server 320 that is separate from the aggregation server 310. The database server 320 is linked to the Internet 500 via the router 350, and the required time information (that is, the calculation result of the totaling server 310) is transmitted to the base station servers 140 and 240 of the base stations 100 and 200 using the Internet 500. It is possible to supply. For connection between the Internet 500 and the router 350, an ISP network may be used, or a content service provider (CSP) network 700 may be used. The firewall 340 protects the internal security of the aggregation station 300 from access from the Internet 500.
[0025]
However, the calculation result in the aggregation server 310 may be stored in the storage device of the aggregation server 310 itself, or the required time information may be supplied from the aggregation server 310 to the base station servers 140 and 240 of the base stations 100 and 200. Good. In this supply, the dedicated line 50 can be used without using the Internet 500.
[0026]
In the aggregation station 300, the aggregation server 310 and the aggregation station client 330 can communicate with each other, and the setting contents of the aggregation server 310 can be changed according to the operation of the operator of the aggregation station client 330.
[0027]
The aggregation server 310 is arranged in parallel with any one of the packet monitoring devices in the base station, and calculates the required time based on the mobile terminal identification information and the detection time information obtained by the packet monitoring device of each base station. It may be. Also, the aggregation server is juxtaposed to the packet monitoring device of each base station, and each aggregation server receives the mobile terminal identification information and the detection time information obtained by the packet monitoring device of its own base station and the mobile terminal identification received from other base stations. A configuration may be used in which the required time is calculated based on the information and information on the detection time. Further, a plurality of aggregation servers may be configured in a hierarchical structure so that information on a wider area can be collected and processed as the upper-layer aggregation server.
[0028]
FIG. 9 is a block diagram showing a configuration of the aggregation server 310 according to the first embodiment of the present invention. As shown in the figure, the tabulation server 310 includes a mobile terminal information reception unit 51, a calculation unit 52, a reception data table 53, and various databases 54-60.
[0029]
Next, the operation of the packet monitoring device will be described.
3 and 4 are flowcharts of processing of the packet monitoring apparatus 130 according to the first embodiment of the present invention. Similar operations are performed in other packet monitoring apparatuses. First, the operation mode selection screen shown in FIG. 5 is displayed on the LCD of the display unit 36 (see FIG. 2) (step ST1). An operator of the base station 100 selects an operation mode using a selection button in the figure. Specifically, the selection button of “filter”, “capture”, or “network” is pointed with the mouse of the input unit 38 and clicked. When the selection is completed, the operator etc. selects the confirmation button in the figure. When selection of the confirmation button is detected, processing in each mode is executed (step ST2).
[0030]
When the network setting mode is selected in step ST2, the packet monitoring apparatus 130 shifts to the network setting mode. In this mode, the operator can set or update the network environment so that the packet monitoring device 130 can communicate with the aggregation server 310 of the aggregation station 300 via a dedicated line and the Internet. First, the network setting screen shown in FIG. 6 is displayed (step ST3). As shown in the figure, in the network setting screen, identification information (such as a MAC address) of a base station (for example, the base station 100) to be monitored by the packet monitoring apparatus 130, and other communication for communication performed by the base station 100 are displayed. In addition to the server identification information, the IP address or dedicated line number of the aggregation server 310 to which the packet monitoring device 130 transmits the monitoring result information can be set.
[0031]
An operator or the like inputs setting contents via the keyboard of the input unit 38, and when the input is completed, selects and clicks a confirmation button in the figure. When the constant table setting unit 44 of the calculation unit 31 detects selection of the confirmation button, the content setting finally displayed is updated and stored in the constant table 40 (steps ST4 and ST5). In addition to the contents set in the network setting mode, the constant table 40 stores the contents of the filtering conditions set in step ST7. Further, in step ST5, the calculation unit 31 sets the communication network interface 32 and the line interface 33 according to the setting contents.
[0032]
When the filter condition setting mode is selected in step ST2, the filter condition setting screen shown in FIG. 7 is displayed (step ST6). In the filter condition setting mode, the operator can set or update the filtering condition of the packet monitored by the packet monitoring device 130. The filtering condition is a condition for the packet monitoring device to extract mobile terminal identification information from the IP packet in the analysis of the IP packet.
[0033]
As shown in FIG. 7, on the filter condition setting screen, a data link layer protocol, a transport layer protocol, an application layer protocol, and the like can be selected as filtering conditions for the monitoring target packet. It is also possible to select whether to extract the mobile terminal identification information from the request packet from the mobile terminal, to extract the mobile terminal identification information from the response packet to the mobile terminal, or to extract from both packets.
[0034]
Specifically, the operator points to the protocol to be selected with the mouse of the input unit 38, and the protocol or the like selected by clicking is displayed in bold. The default settings are Ethernet (registered trademark) for the data link layer, TCP for the transport layer, HTTP for the application layer, and request for the packet type. When the selection is completed, the operator etc. selects the confirmation button in the figure. When the constant table setting unit 44 detects selection of the confirmation button, the constant table setting unit 44 updates and sets the filtering condition based on the setting content that is finally displayed in bold in the constant table 40 (steps ST7 and ST8).
[0035]
On the other hand, when the capture mode is selected by the operator or the like in step ST2, the packet monitoring apparatus 130 shifts to the capture mode. In the capture mode, the arithmetic unit 31 analyzes the IP packet, extracts mobile terminal identification information (IP address) from the IP packet that matches the filtering condition, and transmits the mobile terminal identification information and detection time information to the aggregation server 310. To do.
In the capture mode, first, the computing unit 31 confirms the connection status to the dedicated lines 50 and 61 and the log-on status to the communication network, and executes initialization processing such as line connection and log-on to the network if necessary (step ST9). ).
[0036]
Next, the mobile terminal information extracting unit 42 of the computing unit 31 refers to the constant table 40, reads the base station identification information (such as the MAC address described above) set in step ST4, and sets the empty mobile terminal information transmission data set. It is set in the base station ID field (step ST10). This mobile terminal information transmission data set is transmitted from the packet monitoring apparatus 130 to the aggregation server 310 of the aggregation station 300 as notification result information of the packet monitoring apparatus 130 in order to notify the mobile terminal identification information and the detection time information. As shown in FIG. 8, the mobile terminal information transmission data set is composed of four fields: key, base station ID, time code, and mobile terminal identification information (IP address).
[0037]
Next, the mobile terminal information extraction unit 42 refers to the constant table 40, reads out the filtering conditions that have been set in step ST7, and proceeds to step ST12 if it is the default condition (step ST11).
[0038]
In step ST12, the mobile terminal information extraction unit 42 checks whether a packet flowing through the Ethernet (registered trademark) 190 in the base station 100 is taken in by the communication network interface 32 and saved in a reception buffer (not shown). If it is not saved in the reception buffer, the process proceeds to step ST24, where it is checked whether there is an operation input by the operator. If it has been taken into the reception buffer, the process proceeds to step ST13.
[0039]
The mobile terminal information extraction unit 42 extracts the received packet data from the reception buffer (step ST13).
[0040]
First, filtering based on the type of Ethernet (registered trademark) frame is performed to obtain an IP fragment (step ST14). Specifically, the Ethernet (registered trademark) type field is examined, and the Ethernet (registered trademark) destination address, the source address, and the Ethernet (registered trademark) type according to the IP type (IPv4 (0800) or IPv6 (86DD)). The IP fragment is obtained by removing the frame check sequence (FCS) field, hashed using the destination IP address, source IP address, and ID field values as keys, and the hashed fragment is stored in a memory (not shown). To do. If it is determined that it is the first fragment in the obtained key, a reconfiguration timer is started for that key. The reconfiguration timer process is started each time a new key is generated, and when a predetermined time elapses for each key, fragment reception has failed, so all the target fragments in the buffer are discarded, and the process returns to step ST12.
[0041]
Next, filtering by IP address is performed (step ST15). Specifically, the IP header portion of the IP fragment buffered in step ST14 is checked according to the IP version, and a fragment having the same source and destination IP addresses is selected. When a predetermined time of the reconfiguration timer has elapsed, since fragment reception has failed, all the target fragments in the buffer are discarded, and the process returns to step ST12.
[0042]
Here, if the Mobile IP home address option is attached, the home address of the extension header is used as the source address. Mobile IP is a mechanism that enables seamless IP communication even when a mobile terminal moves between networks. An overview of the mechanism and operation of Mobile IP will be described below, taking the case of Mobile IPv4 as an example.
[0043]
In Mobile IP, for example, the mobile terminal 110 (see FIG. 1) is given a home address that can be used in, for example, the home network 600 provided with the home agent 610 (hereinafter referred to as HA). When a mobile terminal moves from a home network and moves to a foreign network provided with, for example, foreign agents 150 and 160 (hereinafter referred to as FA), a care-of address is obtained by an agent advertisement message periodically broadcast from the destination FA. To do. The mobile terminal that has acquired the care-of address notifies the home address and care-of address to the HA. In the state where the above processing is completed, since the mobile terminal has already registered the care-of address in the network, the transmission packet from the mobile terminal to any destination on the Internet can be delivered directly to the destination. Conversely, a transmission packet from a terminal outside the foreign network to which the mobile terminal has moved to the mobile terminal is transmitted to the home address of the mobile terminal, and is encapsulated by the HA and acquired by the mobile terminal. To the care-of address. The encapsulated packet is decapsulated by the FA in the foreign network and delivered to the mobile terminal. With the above mechanism, the mobile terminal can seamlessly communicate with the Internet even if it moves between networks. In the case of IPv4, the home network needs to have HA, and the foreign network needs to have FA, but in the case of IPv6, it is not necessary to have FA.
[0044]
Next, in step ST16, the IP datagram is reconstructed. Specifically, when all the fragments of the same source / destination selected in step ST15 are prepared and reconfiguration is possible, the reconfiguration timer is stopped / released, and the selected fragments of the same source / destination are selected. Arrange in order according to the value of the fragment offset field.
[0045]
Next, a TCP frame is reconstructed from the IP datagram (step ST17). Specifically, the header of the IP datagram reconstructed in step ST16 is sequentially examined, and all of the protocol number (6 in the case of TCP), the destination IP address, the source IP address, the destination port number, and the source port number. For the same IP datagram, the TCP frame is reconstructed based on the SYN / FIN bit in the code bit field and the sequence number in the sequence number field. Note that the TCP timer is started each time a new protocol number, destination IP address, source IP address, destination port number, and source port number condition occurs, and an IP datagram that satisfies the condition when a predetermined time elapses Are all discarded, and the process returns to step ST12. Since the reconstructed IP datagram may be discarded in step 17, in step 16, the IP datagram is sent to the next processing in the list structure without being reconstructed. You may make it perform a structure.
[0046]
Next, filtering by the TCP port is performed (step ST18). Specifically, the TCP frame obtained in step ST17 is discarded if the protocol number is other than 6 (TCP). If discarded, all IP datagrams related to the conditions are deleted, and the process returns to step ST12.
[0047]
Next, filtering by the destination port number is performed (step ST19). Specifically, the reconfigured TCP frame is classified for each destination address (application type). Here, when paying attention to the http application, TCP frames other than the destination address 80 are discarded. If discarded, all IP datagrams related to the conditions are deleted, and the process returns to step ST12.
[0048]
Next, an access response according to http corresponding to an access request (for example, GET http://www.w3.org/index.html HTTP / 1.0) according to http is matched (step ST20). . That is, if there is no response corresponding to the request within a certain time, the buffering content related to the previous request or response is discarded. If discarded, the IP datagram related to the condition is cleared, and the process returns to step ST12.
[0049]
Next, the IP address included in the TCP frame corresponding to the above request is determined as identification information of the mobile terminal 110 to be extracted (step ST21).
[0050]
As described above, the mobile terminal information extraction unit 42 pays attention only to the service request packet of the HTTP protocol on TCP / IP, and extracts the network address of the transmission source, thereby avoiding the waste of decoding all packet contents. It can be omitted.
[0051]
Next, the mobile terminal information transmission unit 43 sets the IP address extracted in step ST21 in the IP address field of the mobile terminal information transmission data set, writes the time information obtained by the real time clock 35 in the time code field, and transmits the transmission data. A set is created and transmitted to the aggregation server 310 through the line interface 33 (step ST22). The mobile terminal information transmission data set may be accumulated for a predetermined time such as 1 to 5 minutes and transmitted together. In this way, when the traffic volume is large, an effect of reducing the risk of complication of communication traffic can be expected. However, if the accumulation time is too long, the time constant for capturing the tendency of traffic fluctuations increases, and the prediction accuracy such as required time decreases, so an appropriate value must be used.
[0052]
The mobile terminal information transmission data set transmitted to the aggregation server 310 is stored in the transmission data log table 41 (step ST23).
[0053]
Thereafter, if there is an operation input via the input unit 8, the input content is checked, and if the setting is changed, the process returns to step ST1 (step ST24, step ST25). If log display is selected, the contents of the transmission data log table 41 are displayed through the display unit 36 (step ST26).
[0054]
In step ST11, if the filtering condition is set to a value other than the default, the process proceeds to step ST27. Although the process of step ST27 differs depending on the filtering condition, for example, there is the following process.
[0055]
For example, in a communication network that dynamically issues an IP address to the mobile terminal 110, an IP address that does not overlap with the other mobile terminals 110 is assigned by an IP grant server such as a DHCP server. The mobile terminal 110 that uses such a service includes a DHCP client. The mobile terminal 110 receives the periodic advertisement of the DHCP server on the communication network using the DHCP client, knows the location of the server, and issues a registration request to the server. The server authenticates the mobile terminal 110 that has received the request, and returns a registered content such as an assigned IP address to the mobile terminal 110 if it is a valid terminal. In this way, the mobile terminal 110 is assigned an IP address and can receive a service provided by the network. It is possible to access the external Internet from the network. When the base station segment is set to such a type of network, a local address is set in advance as the global address / local address of the filtering condition shown in FIG. The mobile terminal information extraction unit 42 checks whether the IP address of the buffered IP fragment is within the set range of the local address, and if not, clears the IP datagram related to the condition, and performs step ST12. Return to. Further, when the DHCP request and the DHCP response match, the source IP address of the DHCP request may be set to be extracted.
[0056]
On the other hand, in the case of a network mainly serving a terminal having a global address in the base station, the global address / local address of the filtering condition is set in advance. Then, it is checked whether the identification information of the mobile terminal 110 is within the set global address range. If not, all IP datagrams relating to the condition are deleted, and the process returns to step ST12.
[0057]
As the identification information of the mobile terminal 110, identification information on network access may be used. For example, only the prefix portion of the IP address or other portions may be used. As a result, when the base station is a local network, it is possible to eliminate waste of repeatedly transmitting information on the common part. In addition, even in a global network type base station, it is possible to eliminate wasteful processing by separately transmitting individual addresses separately in more detail within the mobile terminal 110.
[0058]
The mobile terminal information transmission unit 43 uses the mail transmission / reception function to send it to the aggregation server 310 of the aggregation station 300 using the mail transmission / reception function every time log files for a predetermined time are collected. May be. Further, the aggregation server 310 may be pushed using FTP (File Transfer Protocol). Alternatively, the data may be PUT to the aggregation station server 310 by http.
[0059]
Next, the aggregation process by the aggregation server 310 will be described.
As shown in FIG. 1, the mobile terminal information transmission data set is transmitted from the aggregation server 310 to the packet monitoring device 130 via the modem 80, the dedicated line 150, the modem 270 of the aggregation station, the line interface of the aggregation server 310, and the like. Done.
Aggregation server 310 is on standby for reception in the framework of transmission and reception with packet monitoring device 130 and receives the mobile terminal information transmission data set transmitted from packet monitoring device 130.
[0060]
In order to transmit / receive the mobile terminal information transmission data set, instead of using a line, the packet monitoring device 130 is used as a client of the aggregation server 310, and the base station ID in the data set does not include base station information. The source server IP address, that is, the IP address unique to the packet monitoring device 130 may be extracted on the aggregation server 310 side, and this may be used as base station information. As a result, the amount of transmission data can be reduced.
[0061]
FIG. 10 is a flowchart of the aggregation process by the aggregation server 310. When the mobile terminal information receiving unit 51 receives the terminal identification information transmission data set from the base station 100, the mobile terminal identification information (IP address) in the mobile terminal information transmission data set is already stored in the reception data table shown in FIG. It is checked whether it has been registered (step ST51). As illustrated in FIG. 11, the reception data table 53 includes fields of “terminal identification information (IPX)”, “time (minutes, TX)”, and “base station identification information (BSX)”. The contents set in the “IP address” of the terminal identification information transmission data set are set in the terminal identification information. Further, the contents of the “time code” field are set for the time, and the contents of the “base station ID” field are set for the base station identification information. If the same terminal information is registered as a result of the processing, the process proceeds to step ST52. On the other hand, if not registered, the contents of the received terminal identification information transmission data set are registered in the reception data table 53 (step ST57).
[0062]
When the terminal identification information of the mobile terminal 110 has been registered in the reception data table 53, the base station identification information set in the base station identification information field is compared with the base station ID in the received data set. (Step ST52). If the two base stations are the same as a result of the comparison, the received terminal identification information transmission data set is rejected (step ST56). If the two base stations are different, the process proceeds to step ST53.
[0063]
If the base station 200 different from the terminal identification information transmission data set is registered on the reception data table 53, the calculation unit 52 takes time to move from the base station 200 to the base station 100, that is, time Difference = "time code" of terminal identification information transmission data set- "time" of corresponding terminal identification information in reception data table 53 is calculated (step ST53).
[0064]
Next, it is determined whether or not the time difference obtained in step ST53 is greater than or equal to a predetermined value (step ST54). The predetermined value is, for example, a value for confirming that the variance of the section distance / time value or the instantaneous required time value with respect to the moving average is not an abnormal value far from the past tendency. Since identification information on network communication such as an IP address may be dynamically assigned to a terminal, the same IP address may be assigned to different mobile terminals. In such a case, position information of two mobile terminals may be extracted with the same identification information. That is, there is a possibility that one mobile terminal may be detected as if it moved in a certain section in a very short time. Therefore, the aggregation server 310 needs to execute an appropriate filtering process in order to avoid such detection. For this reason, the calculation result is discarded when the time required for the instantaneous section is a value that cannot be obtained from the distance between the base stations. Specifically, it is realized as follows. For example, the minimum limit time and the maximum limit time are stored for each uplink and downlink between the base stations, and discarded if smaller than the minimum limit value. If it is greater than the maximum limit value, it will be interpreted as parking or stopping on the way, or stopping on a side road. Thereby, the risk that abnormal data is collected can be reduced.
[0065]
When the time difference is larger than the predetermined value, the time difference is recorded in “Required time (instant)” in the instantaneous section required time database 54 shown in FIG. At the same time, the year, month, day, and time fields are recorded from the time code of the received terminal identification information transmission data set, and the weather is also registered (step ST55). However, even if it is instantaneous, when there is a lot of traffic, in order to avoid an increase in the table size, the average for every minute is actually calculated as the instantaneous section required time.
[0066]
When the time difference obtained in step ST53 is less than the predetermined value, the process proceeds to step ST56, and the received terminal identification information transmission data set is rejected. Alternatively, the time information in the terminal identification information transmission data set is additionally recorded in the reception data table as the time of entry of the mobile terminal 110 into the radio wave zone of the base station 100 without rejecting the data set. Then, the terminal identification information transmission data set of the same combination (mobile terminal 110, base station 100) is periodically checked, and when the session times out, the time is determined as the zone exit time of mobile terminal 110, and the movement The staying time in the zone of terminal 110 may be obtained.
[0067]
The contents of the weather item are periodically input by an operator or the like using an input means (not shown). Alternatively, the weather forecast information may be automatically referred to and input using the Web or the like. Alternatively, the weather information may be confirmed at the end of the day, and an operator or the like may additionally register. In the latter case, there is an effect that a more accurate value can be obtained when calculating the statistical value of the required time. The former has the effect that weather information can be taken into account for predicting and calculating the required time.
[0068]
The calculation unit 52 calculates the short time average required time based on the instantaneous section required time database 54 based on the calculation result of the above required time and registers it in the short time average required time database 55 shown in FIG. ST58). The short time average required time is a simple average value of required time from a predetermined time T before (t−T) to the time (t). Specifically, every time 5 minutes elapses, an average required time of 5 minutes is calculated and registered based on the instantaneous time required for the section.
[0069]
Next, the calculation unit 52 calculates the long-time average required time as statistical value information based on the instantaneous interval required time database 54 and registers it in the long-time average required time database 56 shown in FIG. 14 (step ST59).
[0070]
Next, the calculation unit 52 calculates the estimated section required time based on the short time average required time database 55 and the long time average required time database 56 and registers it in the estimated section required time database 57 shown in FIG. 15 (step ST60). ). The section prediction required time is obtained based on the data of the current situation (weather, day of the week, traffic jams, etc.), and is calculated by changing the adaptation data when the situation changes.
[0071]
An example of calculating the estimated section required time will be described below. Let L be the section distance of the target section (base station 200 → base station 100).
First, K = short time average required time / long time learning average required time is calculated.
Estimated required time after n minutes YTn = Long average learning required time after n minutes × K
Calculate the predicted average speed YAV = L / YTn.
The predicted congestion level is classified by the speed zone of YAV.
[0072]
Next, the calculation unit 52 calculates a plurality of section prediction required times based on the section prediction required time database 57 as follows, and records them in the plurality of section prediction required time database 58 shown in FIG. 16 (step ST61).
For example, when calculating the estimated time required for a plurality of sections: section: base station BS1 → (base station BS2: via) → base station BS3.
Predicted time for multiple sections YT (1 → 3) = predicted section required time for BS1 → BS2 + predicted section required time for BS2 → BS3
Predicted average speed YAV (1 → 3) = L (1 → 3) / YT (1 → 3)
The predicted congestion degree is classified by the speed zone of YAV (1 → 3).
[0073]
Note that each time a new base station is added, the aggregation server 310 updates the inter-base station distance database 59 shown in FIG. 18 and the base station identification number database shown in FIG.
[0074]
When the aggregation processing is completed, the aggregation server 310 stores the contents of the short time average required time database 55, the long time average required time database 56, the section predicted required time database 57, and the multiple section predicted required time database 58 in the database server 320 ( Step ST62).
[0075]
Next, information providing processing by the database server 320 will be described using the flowchart of FIG. In the database server 320, when a transmission request is received from a specific information providing center or an information distribution server such as a Web server installed for each base station, or when a transmission time to a predetermined destination is reached (step ST71). ), The requested time information stored in the database server 320 or a predetermined information item is transmitted. Information may be transmitted in response to a request from an arbitrary client. Also, consideration can be obtained according to the type and amount of information to be transmitted.
[0076]
As described above, according to the first embodiment, the packet monitoring device 130 monitors the IP packet transmitted from the mobile terminal 110 accessing the communication network through the base station 100, and extracts the mobile terminal identification information. Therefore, there is an effect that mobile terminal information can be collected without mounting a special device on the mobile terminal and without impairing the privacy of the mobile terminal user.
[0077]
Further, according to the first embodiment, the mobile terminal information collected by the packet monitoring device 130 is transmitted to the totaling server 310, and the totaling server 310 calculates the estimated section required time from the obtained mobile terminal information. Therefore, there is an effect that it is possible to provide traffic statistics information such as time required for each time zone and each section.
[0078]
Further, according to the first embodiment, the mobile terminal information extraction unit 42 extracts mobile terminal identification information by paying attention only to IP packets that match preset filtering conditions. There is an effect that it is possible to eliminate the waste of deciphering the contents.
[0079]
Further, according to the first embodiment, the mobile terminal information extraction unit 42 reconstructs the IP datagram and extracts the identification information of the mobile terminal from the reconstructed IP datagram. There is an effect that it is possible to eliminate the waste of decoding the contents of the packet that failed.
[0080]
Further, according to the first embodiment, the mobile terminal information transmission data set is accumulated for a predetermined time, and is transmitted to the aggregation server 310 collectively, thereby reducing the communication traffic when the traffic volume is large. .
[0081]
Embodiment 2. FIG.
FIG. 21 is a block diagram showing a configuration of a base station provided with a mobile terminal identification information collecting apparatus according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 1 or FIG. 20 indicate the same components. As shown in the figure, the packet monitoring device 430 is incorporated as firmware in the serial communication server 400. Thereby, there is an effect that resources such as a housing and a CPU can be shared.
[0082]
Embodiment 3 FIG.
FIG. 22 is a block diagram showing a configuration of a base station provided with a mobile terminal identification information collecting apparatus according to Embodiment 3 of the present invention. The same reference numerals as those in FIG. 1 or FIG. 20 indicate the same components. As shown in the figure, the packet monitoring device 430 is incorporated as firmware in a router at the point of contact with the host network. Furthermore, it may be incorporated in the roadside machine as firmware. Thereby, there is an effect that resources such as a housing and a CPU can be shared.
[0083]
【The invention's effect】
As described above, according to the present invention, the mobile terminal information extraction unit monitors the IP packet transmitted from the mobile terminal accessing the communication network through the radio base station, IP datagram reconstructed from IP packets transmitted from the same mobile terminal to the same destination, and reconstructed IP datagram The mobile terminal identification information is extracted from the mobile terminal information transmission unit together with the IP packet detection time and the radio base station identification information. , Calculate the estimated time required to move the mobile terminal between radio base stations Since it is transmitted to the required time information aggregation device, the location information of an unspecified number of mobile terminals that access the network through the wireless base station in order to use various services provided on the network is made special to the mobile terminal. There is an effect that a mobile terminal identification information collecting device that can be collected without mounting a simple device and without impairing the privacy of the mobile terminal user can be obtained.
[0084]
According to this invention, the mobile terminal information receiving unit that receives the mobile terminal identification information together with the IP packet detection time and the radio base station identification information from the mobile terminal identification information collecting device; Based on the received information, the time difference when the mobile terminal passes through the radio base station is calculated, and a time difference greater than or equal to a predetermined value determined from the calculated time difference is determined as the instantaneous interval required time. Based on the section travel time, Mobile terminal wireless Necessary for moving between base stations Do section prediction Since the calculation unit for calculating the required time is provided, it is possible to obtain a required time information totaling device that provides traffic statistical information such as time required for each time zone from the location information of the mobile terminal.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a traffic information providing system including a mobile terminal identification information collecting device and a required time information totaling device according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing a configuration of packet monitoring apparatuses 130 and 230 according to Embodiment 1 of the present invention.
FIG. 3 is a flowchart of processing of a packet monitoring apparatus 130 according to Embodiment 1 of the present invention.
FIG. 4 is a flowchart of processing of a packet monitoring apparatus 130 according to Embodiment 1 of the present invention.
FIG. 5 is a layout diagram of an operation mode selection screen according to the first embodiment of the present invention.
FIG. 6 is a layout diagram of a network setting screen according to the first embodiment of the present invention.
FIG. 7 is a layout diagram of a filter condition setting screen according to the first embodiment of the present invention.
FIG. 8 is a configuration diagram of a mobile terminal information transmission data set according to the first embodiment of the present invention.
FIG. 9 is a block diagram showing a configuration of an aggregation server 310 according to the first embodiment of the present invention.
FIG. 10 is a flowchart of a counting process by a counting server 310 according to the first embodiment of the present invention.
FIG. 11 is a configuration diagram of a reception data table according to the first embodiment of the present invention.
FIG. 12 is a configuration diagram of an instantaneous interval required time database according to the first embodiment of the present invention.
FIG. 13 is a configuration diagram of a short time average required time database according to the first embodiment of the present invention.
FIG. 14 is a configuration diagram of a long-time average required time database according to the first embodiment of the present invention.
FIG. 15 is a configuration diagram of a section prediction required time database according to the first embodiment of the present invention.
FIG. 16 is a configuration diagram of a multi-section predicted required time database according to the first embodiment of the present invention.
FIG. 17 is a flowchart of information providing processing by the database server 320 according to Embodiment 1 of the present invention;
FIG. 18 is a configuration diagram of an inter-base station distance database according to the first embodiment of the present invention.
FIG. 19 is a configuration diagram of a base station identification number database according to the first embodiment of the present invention.
FIG. 20 is a block diagram showing another example of a configuration of a base station provided with a mobile terminal identification information collection device according to Embodiment 1 of the present invention.
FIG. 21 is a block diagram showing a configuration of a base station provided with a mobile terminal identification information collection apparatus according to Embodiment 2 of the present invention.
FIG. 22 is a block diagram showing a configuration of a base station provided with a mobile terminal identification information collection device according to Embodiment 3 of the present invention.
[Explanation of symbols]
31 operation unit, 32 communication network interface, 33 line interface, 35 real time clock, 36 display unit, 37 audio output unit, 38 input unit, 39 roadside unit interface, 40 constant table, 41 transmission data log table, 42 mobile terminal information extraction Unit, 43 mobile terminal information transmission unit, 44 constant table setting unit, 50, 61 dedicated line, 51 mobile terminal information reception unit, 52 operation unit, 53 reception data table, 54 instantaneous section required time database, 55 short time average required time Database, 56 Long time average required time database, 57 section predicted required time database, 58 Multiple section predicted required time database, 59 Inter-base station distance database, 60 Base station identification number database, 100, 200 Base stations, 110, 210, 410 Mobile terminal, 12 0, 220, 420 Roadside unit, 121, 221, 421 Narrow-area wireless communication interface, 122, 222, 422 processing unit, 123, 223 Network communication interface, 124, 424 Serial communication interface, 130, 230, 430 Packet monitoring device ( Mobile terminal identification information collecting device), 140, 240 base station server, 150, 250, 350 router, 160, 260 network server, 170, 270 repeating hub, 180, 280, 360 modem, 190, 290 Ethernet (registered trademark), 300 totaling station, 310 totaling server (required time information totaling device), 320 database server, 330 totaling station client, 340 firewall, 400 serial communication server, 500 Internet, 600 Internet service Service provider network, 610 home agent, 700 content service provider network, 800 fixed terminal.

Claims (4)

The IP packet transmitted from the mobile terminal accessing the communication network through the radio base station is monitored, the IP datagram is reconstructed from the IP packet transmitted from the same mobile terminal to the same destination, and the reconstructed IP data A mobile terminal information extraction unit for extracting identification information of the mobile terminal from the gram ,
The identification information of the mobile terminal together with the identification information of the detected time and the wireless base station of the IP packet, required time information collection apparatus that the mobile terminal calculates the interval prediction time required to move between the radio base station A mobile terminal identification information collection device comprising: a mobile terminal information transmission unit that transmits data to a mobile terminal.   The mobile terminal information extracting unit refers to a constant table storing preset conditions for extracting IP packets, and selects an IP packet for extracting identification information based on the set extraction conditions. Item 4. The mobile terminal identification information collection device according to Item 1. 3. The mobile terminal identification information collecting apparatus according to claim 1, wherein the mobile terminal information transmitting unit accumulates identification information of a plurality of mobile terminals and transmits the accumulated information to a required time information totaling apparatus. From the mobile terminal identification information collection device that monitors the IP packet transmitted from the mobile terminal that accesses the communication network through the radio base station, the identification information of the mobile terminal extracted from the IP packet, the detection time of the IP packet and A mobile terminal information receiver that receives the identification information of the radio base station;
Based on the information received by the mobile terminal information receiving unit, the time difference when the mobile terminal passes through the radio base station is calculated, and the time difference equal to or greater than a predetermined value is instantly calculated from the calculated time differences. determined as the section travel time, obtained on the basis of the instantaneous interval duration, the mobile terminal required time information collection apparatus that includes a calculator for calculating the section Estimated time required to move between the radio base station.

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