JP2005012462A - Radio communication system, distribution server, and radio terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently select data related to a pertinent region from collectively distributed data related to respective regions. <P>SOLUTION: A distribution server 8 adds range information indicating ranges of regions to data related to respective regions A and B and distributes the data by multicasting or broadcasting. Radio terminals 1a and 1b select data related to regions where they exist, from collectively distributed data related to respective regions, on the basis of their location information acquired by electric waves from a GPS satellite 3 and range information added to the distributed data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication system that distributes data related to each region to each region by multicast or broadcast, a distribution server, and a wireless terminal that receives the distributed data.
[0002]
[Prior art]
As a conventional technique for providing a multicast service, for example, there is a technique disclosed in Patent Document 1. This is a multicast service providing method in which a multicast information delivery service is provided from an information delivery device to a wireless terminal in the service area via a wireless section, and a multicast information delivery service required by each wireless terminal. Only to be able to receive.
[0003]
In this multicast service providing method, the information distribution apparatus uses a predetermined wireless channel for all wireless terminals in the service area to identify information for identifying the multicast information in the distribution service and a wireless channel used for distributing the multicast information. The wireless terminal in the service area receives a multicast information distribution service from the information distribution apparatus through the notified wireless channel.
[0004]
The wireless terminal in the multicast service providing method described in Patent Document 1 can receive only the multicast information required by each wireless terminal, but the received multicast information is related to each region in the service area. When individual information (data) is included, it takes time and effort to find only information (data) related to the area where the wireless terminal exists.
[0005]
[Patent Document 1]
JP 2001-308856 A (paragraph 0014)
[0006]
[Problems to be solved by the invention]
Since the conventional communication system is configured as described above, among the data related to each area distributed in a batch by multicast or broadcast, the data related to the area in which the wireless terminal exists is stored in the wireless terminal. There was a problem that it took time and effort to search, and data related to the area could not be searched efficiently.
[0007]
The present invention has been made to solve the above-described problems, and efficiently selects data related to each area from data related to each area distributed collectively by multicast or broadcast. An object of the present invention is to obtain a wireless communication system, a distribution server, and a wireless terminal.
[0008]
[Means for Solving the Problems]
The wireless communication system according to the present invention distributes data related to each area to each area by multicast or broadcast, and adds range information indicating the area range to the data related to each area. Or, based on the distribution server that distributes by broadcast and the acquired location information and the range information added to the distributed data, the self exists from the data related to each region distributed in a batch And a wireless terminal that selects data related to the area.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described.
Embodiment 1 FIG.
1 is a diagram showing a configuration of a radio communication system according to Embodiment 1 of the present invention. This wireless communication system includes wireless terminals 1a and 1b, a communication satellite 2, a GPS (Global Positioning System) satellite 3, a satellite base station 4, a base station server 5, a router 6, a LAN 7, and a distribution server 8. Has been.
[0010]
The distribution server 8 distributes data related to each region to each region in a batch by the multicast type or the broadcast type, and each data block constituting the data to be distributed serves as range information for specifying the range of each region. A range tag is added. Data from the distribution server 8 is transmitted to the satellite base station 4 via the LAN 7, the router 6, and the base station server 5. The satellite base station 4 transmits data from the distribution server 8 to the communication satellite 2. The communication satellite 2 may be a broadcasting satellite, and receives data from the satellite base station 4 and transmits it to areas A and B within a predetermined service range.
[0011]
The wireless terminals 1a and 1b existing in each of the areas A and B receive the data transmitted from the communication satellite 2, and obtain the current position information of the latitude, longitude, and altitude by the radio waves from the GPS satellite 3. Calculate and check whether the calculated position information is within the range specified by the range tag as the range information added to each data block transmitted from the communication satellite 2, and each transmitted from the communication satellite 2 From the data related to the area, the data block related to the area where the wireless terminals 1a and 1b exist is selected and displayed.
[0012]
In the position measurement using the radio wave from the GPS satellite 3, it is necessary to capture four GPS satellites 3. Incidentally, in the NAVSTAR operated and managed by the United States, 24 GPS satellites 3 are in operation, and by capturing 4 of these, it is possible to acquire position information of latitude, longitude, and altitude.
[0013]
In the position measurement by the wireless terminals 1a and 1b alone, a measurement position error of about 100 m occurs, but the position error can be improved to about 10 m by D-GPS (differential GPS) using correction information. A method using a quasi-zenith satellite to receive correction information is also conceivable. The correction information is currently operated by the method of transmitting by FM broadcast wave. However, according to the quasi-zenith satellite, the correction information can be received if it is a place where the sky can be seen in the range of elevation angle of 60 degrees in Japan. The places where it can be used are wide and significant. The quasi-zenith satellite is a future satellite that can transmit radio waves from directly above Japan by switching the three satellites in sequence. Further, in an area where radio waves from the GPS satellite 3 do not reach sufficiently, a Pseudo satellite (pseudo satellite) installed on the ground may be used.
[0014]
FIG. 2 is a block diagram showing the internal configuration of the wireless terminals 1a and 1b. The wireless terminals 1a and 1b include a position information calculation unit 21 that calculates position information of the current latitude, longitude, and altitude by radio waves from the GPS satellite 3, a position information storage unit 22 that stores the calculated position information, and communication. A data receiving unit 23 that receives data transmitted from the satellite 2, a data interpreting unit 24 that interprets the received data and extracts a data block, and each data from which position information stored in the position information storage unit 22 is extracted The data block selecting unit 25 that checks whether the data is included in the range specified by the range tag as the range information added to the block, and selects the data block included in the range, displays the selected data block. The data block display unit 26 is configured.
[0015]
Next, the operation will be described.
The distribution server 8 adds range tags as range information for specifying the ranges of the areas A and B to each data block constituting the data, and the LAN 7, the router 6, the base station server 5, the satellite base station 4, the communication satellite 2 is distributed in a batch by a multicast type or a broadcast type.
[0016]
As described above, in the first embodiment, the range information specifying the ranges of the regions A and B is included in the data to be displayed to the user and transmitted, so that the upper level of the OSI (Open Systems Interconnection) reference model of the network is higher. Transmission of range information is realized in a layer (presentation layer).
[0017]
FIG. 3 is a diagram showing an example of data distributed by the distribution server 8. Here, an example of a weather forecast for the region A (Tokyo) and the region B (Nagoya) is shown, and the data is described in an XML (eXtensible Markup Language) format. Has been. In FIG. 3, each data block is designated by a data block tag (<data block>... </ Data block>), and the names of the regions A and B related to each data block are area name tags (<area name>). .. </ Area name>), and range information indicating the range of region A and region B is specified by a range tag (<range>... </ Range>).
[0018]
In addition, the altitude as an application range is specified by an altitude range tag (<altitude range>... </ Altitude range>), and the time as an application range is a time range tag (<time range> .. </ time range> ). Further, the data to be distributed is specified by a distribution information tag (<distribution information>... </ Distribution information>).
[0019]
In the example shown in FIG. 3, the area A and the area B are designated as rectangular areas. Two vertices on opposite diagonal lines of the rectangular area are designated by latitude and longitude, and the weather forecast data is distributed as data related to the range of the rectangular area. The wireless terminals 1a and 1b that have received the weather forecast data preferentially select and display the weather forecast data related to the area in which they exist, and discard the weather forecast data not related to the area. .
[0020]
Since the XML format tag can be freely defined, any definition other than this example may be used as long as it is a definition that associates the data to be transmitted with the locations of regions A and B. However, it is necessary to share the definition of the XML format between the distribution server 8 and the wireless terminals 1a and 1b so that the definition of the XML format can be interpreted. Also, it is easy to implement an equivalent function even with an original method that does not depend on the XML format.
[0021]
FIG. 4 is a flowchart showing a processing flow of the wireless terminal 5. In step ST <b> 11, the position information calculation unit 21 of the wireless terminals 1 a and 1 b calculates the current position information from the GPS satellite 3 and stores the calculated position information in the position information storage unit 22.
[0022]
In step ST12, the data receiving unit 23 receives data transmitted from the communication satellite 2. In step ST13, the data interpreter 24 interprets each tag of the received XML format data, and in step ST14, the data block 24 uses the data block tag (<data block>... </ Data block>) shown in FIG. To extract.
[0023]
In step ST15, the data block selection unit 25 uses the range tag (<range>...) As the range information shown in FIG. 3 in which the position information stored in the position information storage unit 22 is described in the extracted data block. -Check whether it is within the range specified by </ Range>, and select a data block that falls within that range. In step ST16, the data block display unit 26 displays the selected data block.
[0024]
If the position information stored in the position information storage unit 22 is not within the range specified by the range tag, the data block selection unit 25 skips the data block in step ST17.
[0025]
For example, if the wireless terminal 1a exists in Tokyo in the area A, the data block selection unit 25 selects the data block specified by <area name> Tokyo </ area name> shown in FIG. Skips the data block specified by area name> Nagoya </ area name>. On the other hand, if the wireless terminal 1b exists in Nagoya in the region B, the data block selection unit 25 skips the data block specified by <area name> Tokyo </ area name> shown in FIG. Select the data block specified by area name> Nagoya </ area name>.
[0026]
In step ST18, the data interpretation unit 24 checks whether there is another data block in the received data, and if it exists, returns to step ST14 and extracts the next data block. On the other hand, if there is no other data block in the received data, the process is terminated.
[0027]
As described above, according to the first embodiment, the wireless terminals 1a and 1b calculate the current position information from the radio wave from the GPS satellite 3 and are distributed from the distribution server 8 by the multicast type or the broadcast type. In addition, by receiving data related to each region and selecting a data block to which a range tag included in the received data is added based on the calculated location information, it is collectively performed by a multicast type or a broadcast type. There is an effect that data related to the area where the wireless terminal exists can be efficiently selected and displayed from the distributed data related to each area. For example, when the wireless terminals 1a and 1b are PDAs (Personal Digital Assistants) or the like, the display screen is generally small, which is significant.
[0028]
Embodiment 2. FIG.
The diagram showing the configuration of the wireless communication system according to the second embodiment of the present invention is the same as FIG. 1 of the first embodiment. In the first embodiment, the range information is transmitted in the upper layer (presentation layer) of the OSI reference model of the network. In the second embodiment, the range information is transmitted in the lower layer (network layer) of the OSI reference model of the network. The data transmission destination is a multicast address based on geographic information, and the wireless terminals 1a and 1b acquire the multicast address from the calculated position information, and acquire the transmitted packet out of the transmitted packets. Data of a multicast address is selected and displayed.
[0029]
FIG. 5 is a diagram showing a field format of a multicast address of the IP (Internet Protocol) protocol. FIG. 5A shows a field format of a 32-bit multicast address of IPv4 (IPv4), and FIG. FIG. 5C shows an example of the IPv6 128-bit multicast address field of the protocol, and FIG. 5C is an example of IPv6 of FIG. 5B, showing an example of a multicast address when a multicast group is created based on a region. ing.
[0030]
In FIG. 5A, the first 4 bits indicate an IPv4 multicast address, and the remaining 28 bits indicate a multicast group ID. In FIG. 5B, the first 8 bits indicate an IPv6 multicast address, the next 4 bits indicate a flag bit and a scope bit, and the remaining 112 bits indicate a multicast group ID. . Further, in FIG. 5C, the first “ff” indicates the first 8 bits in FIG. 5B, the next “0” indicates the flag bit in FIG. 5B, and the next “2”. "Indicates the scope bit of FIG. 5B, and the subsequent": 0: 0 ...: 114 "indicates the multicast group ID of FIG. 5B.
[0031]
FIG. 6 is a diagram showing an example of a region-multicast address correspondence table showing correspondence between regions and multicast addresses. In FIG. 6, the area is designated by the latitude and longitude of two vertices on the opposite diagonal of the rectangular area, and the area ID is classified into a large classification and a small classification, and the area ID corresponding to the large classification and the small classification is shown in FIG. The multicast address shown in (c) is specified. 5C is assigned to the “xxxx” portion of the multicast address in FIG. 5C, and the small region ID is assigned to the “yyyy” portion. The region-multicast address correspondence table as shown in FIG. 6 is shared by the distribution server 8 and the wireless terminals 1a and 1b.
[0032]
In FIG. 6, each area is divided into rectangular areas by two opposite latitudes and longitudes on the diagonal, but each area may be divided into polygonal areas by the latitude and longitude of the apex of the area, Each region may be divided into circular regions by the center of the region by latitude and longitude and the radius from the center.
[0033]
FIG. 7 is a block diagram showing the internal configuration of the wireless terminals 1a and 1b. A position information calculation unit 31 for calculating the current position information of the latitude, longitude and altitude from the radio wave from the GPS satellite 3 is shown in FIG. A region-multicast address correspondence table 32 as shown, a multicast address acquisition unit 33 for acquiring its own multicast address by referring to the region-multicast address correspondence table 32 from the calculated position information, and a multicast address storage for storing the acquired multicast address Unit 34, packet receiving unit 35 for receiving a packet transmitted from communication satellite 2, and determining whether the stored multicast address matches the multicast address added to the header of the received packet and selecting the packet Packet selection unit 36 It is constituted by the data display unit 37 for displaying the data contained in the selected packet.
[0034]
Next, the operation will be described.
The distribution server 8 inserts the multicast address of the transmission destination corresponding to the region to be distributed into the header portion of the packet based on the region-multicast address correspondence table as shown in FIG. 6, and the LAN 7, router 6, base station server 5, Through the satellite base station 4 and the communication satellite 2, packets are distributed collectively by a multicast type or a broadcast type. In this case, it is easy for the distribution server 8 to prepare an electronic map or the like, select an area where data is to be distributed by using a GUI (Graphical User Interface), and obtain a multicast address based on the latitude and longitude. .
[0035]
As described above, in the second embodiment, end-to-end between transmission and reception is performed by inserting a multicast address as range information for designating the range of region A and region B into the header portion of the packet and transmitting it. The range information is transmitted in the lower layer (network layer) of the OSI reference model of the network that guarantees communication.
[0036]
FIG. 8 is a flowchart showing a processing flow of the wireless terminals 1a and 1b. In step ST <b> 21, the position information calculation unit 31 of the wireless terminals 1 a and 1 b calculates the current position information of the latitude, longitude, and altitude from the radio wave from the GPS satellite 3. In step ST <b> 22, the multicast address acquisition unit 33 refers to the region-multicast address correspondence table 32 based on the calculated position information, acquires its own multicast address, and stores it in the multicast address storage unit 34. In this way, the wireless terminals 1a and 1b automatically join the multicast group.
[0037]
In step ST23, the packet receiver 35 receives a packet transmitted from the communication satellite 2. In step ST24, the packet selection unit 36 determines whether the multicast address stored in the multicast address storage unit 34 matches the multicast address inserted in the header portion of the received packet.
[0038]
If the multicast addresses match, the packet selection unit 36 selects the packet in step ST25, and the data display unit 37 displays the data included in the selected packet in step ST26. If the multicast addresses do not match, the packet selector 36 discards the packet in step ST27.
[0039]
In the second embodiment, the multicast address is specified by the large-area ID and the small-area ID. When all the bits of the small-area ID transmitted from the distribution server 8 are 1, Even if the area IDs of the small sections of the multicast addresses stored in the multicast address storage section 34 do not match, if the area IDs of the large sections match, the packet selection section 36 selects the packet. For example, it is possible to perform distribution by designating only a large-area ID such as the Kanto area.
[0040]
In the second embodiment, the example of IPv6 shown in FIG. 5B has been described, but the basic idea is the same for IPv4 shown in FIG.
[0041]
As described above, according to the second embodiment, the wireless terminals 1a and 1b calculate the current position information of the wireless terminals 1a and 1b from the radio wave from the GPS satellite 3, and the region-multicast address correspondence table 32 is calculated from the calculated position information. If the received multicast address is received from the distribution server 8 by the multicast type or the broadcast type, and the acquired multicast address matches the multicast address included in the received packet By selecting the packet, the data related to the area where the wireless terminal exists is efficiently selected and displayed from the data related to each area distributed collectively by the multicast type or the broadcast type. The effect that it can do is acquired.
[0042]
Further, according to the second embodiment, when compared with the first embodiment, by performing range information transmission processing and reception processing in the lower layer (network layer) of the OSI reference model of the network, the wireless terminal 1a , 1b selects a packet by referring to only the header portion of the packet without analyzing the data itself contained in the distributed packet, so that an effect of enabling high-speed reception processing is obtained.
[0043]
Embodiment 3 FIG.
FIG. 9 is a diagram showing a configuration of a wireless communication system according to Embodiment 3 of the present invention. In the first embodiment and the second embodiment, the wireless terminals 1a and 1b directly receive radio waves from the GPS satellite 3 and calculate their own position information. In this third embodiment, the GPS satellites 3 is provided with mobile position information providing devices 9a and 9b that exist in areas A and B mounted on a vehicle or the like that receives radio waves from 3 and calculates and provides position information. The wireless terminals 1a and 1b existing in the vicinity of the mobile station obtain position information provided via the wireless LANs 10a and 10b from the position information providing devices 9a and 9b without directly receiving radio waves from the GPS satellite 3. is there.
[0044]
FIG. 10 is a block diagram showing the internal configuration of the position information providing devices 9a and 9b. The position information providing devices 9a and 9b obtain the current position information of the latitude, longitude, and altitude by radio waves from the GPS satellite 3. It has a wireless LAN communication function based on a location information computing unit 41 that computes, a location information storage unit 42 that stores computed location information, a TCP / IP (Transmission Control Protocol / Internet Protocol) protocol, and the like, from the wireless terminals 1a and 1b. Is provided with a position information providing unit 43 that reads and transmits the stored position information in response to a request for acquiring the position information.
[0045]
A specific example of the position information providing devices 9a and 9b can be realized by providing a car navigation system having a function of calculating position information by radio waves from the GPS satellite 3 with wireless communication means such as a wireless LAN.
[0046]
FIG. 11 is a block diagram showing the internal configuration of the wireless terminals 1a and 1b. As in the first embodiment, range information is received by the upper layer (presentation layer) of the OSI reference model of the network. The wireless terminals 1a and 1b have communication functions of the wireless LANs 10a and 10b based on the TCP / IP protocol or the like instead of the position information calculation unit 21 shown in FIG. 2 of the first embodiment, and the position information providing devices 9a and 9b. 2 is provided with a location information acquisition unit 27 that receives location information transmitted by requesting provision of location information, and the other configuration is the same as that shown in FIG. 2 of the first embodiment.
[0047]
FIG. 12 is a block diagram showing the internal configuration of the other wireless terminals 1a and 1b. As in the second embodiment, range information is received by the lower layer (network layer) of the OSI reference model of the network. The wireless terminals 1a and 1b have communication functions of the wireless LANs 10a and 10b based on the TCP / IP protocol or the like instead of the position information calculation unit 31 shown in FIG. 7 of the second embodiment, and the position information providing devices 9a and 9b. 7 includes a position information acquisition unit 38 that receives position information transmitted by requesting the provision of position information, and the other configuration is the same as that shown in FIG. 7 of the second embodiment.
[0048]
Specific examples of the wireless terminals 1a and 1b are PDAs and notebook personal computers having the functions of the wireless LANs 10a and 10b, and even if they do not have a function for calculating position information using radio waves from the GPS satellite 3, they run in the vicinity. The position information can be acquired from the car navigation system as the position information providing devices 9a and 9b mounted on the vehicle.
[0049]
Next, the operation will be described.
FIG. 13 is a flowchart showing a flow of processing of the position information providing devices 9a and 9b. In step ST <b> 31, the position information calculation unit 41 calculates the current latitude, longitude, and altitude position information from the radio wave from the GPS satellite 3, and stores the calculated position information in the position information storage unit 42. Here, D-GPS or the like is used when highly accurate measurement is required. When a vehicle or the like on which the position information providing devices 9a and 9b are mounted is moving, the position information calculation unit 41 calculates the position information whenever necessary and stores the position information in the position information storage unit 42. Update location information.
[0050]
When the location information providing unit 43 receives the location information acquisition request from the wireless terminals 1a and 1b via the wireless LANs 10a and 10b in step ST32, the location information stored in the location information storage unit 42 in step ST33. In step ST34, the read position information is transmitted to the requested wireless terminals 1a and 1b via the wireless LANs 10a and 10b.
[0051]
The position information providing unit 43 defines a TCP well-known (socket) port. When the built-in client program accesses this port, the built-in position information providing server program stores the position information. The latitude, longitude, and altitude position information stored from the stored position information storage unit 42 may be read out.
[0052]
In the processing of the wireless terminals 1a and 1b shown in FIG. 11, the location information acquisition unit 27 uses the TCP / IP protocol or the like via the wireless LANs 10a and 10b instead of step ST11 shown in FIG. 4 of the first embodiment. The location information acquisition request is transmitted to the providing devices 9a and 9b, and the location information transmitted from the location information providing devices 9a and 9b via the wireless LANs 10a and 10b is received by the TCP / IP protocol or the like, and the location information storage unit 22 The other processing is the same as the processing after step ST12 shown in FIG. 4 of the first embodiment.
[0053]
Also, the processing of the wireless terminals 1a and 1b shown in FIG. 12 is performed by the location information acquisition unit 38 via the wireless LANs 10a and 10b using the TCP / IP protocol or the like instead of step ST21 shown in FIG. 8 of the second embodiment. It suffices to transmit a location information acquisition request to the location information providing devices 9a and 9b and receive the location information transmitted from the location information providing devices 9a and 9b via the wireless LANs 10a and 10b using the TCP / IP protocol or the like. This process is the same as the process after step ST22 shown in FIG. 8 of the second embodiment.
[0054]
When the IEEE802.11b / a / g wireless LAN is used as the wireless LANs 10a and 10b, the radio wave reachable distance is about 100 m to 300 m when the access point does not have directivity. The existing wireless terminals 1a and 1b can acquire position information from the position information providing devices 9a and 9b.
[0055]
Further, when a Bluetooth wireless LAN is used as the wireless LANs 10a and 10b, the radio wave arrival distance varies depending on the mode, but is about several meters to a hundred meters. Therefore, the wireless terminals 1a and 1b existing in this range have positional information. Can be obtained.
[0056]
Furthermore, when infrared communication is used as the wireless LANs 10a and 10b, the communicable distance in the infrared communication is about several meters to 10 meters, so that the wireless terminals 1a and 1b existing in this range can acquire position information. .
[0057]
As described above, the position information provided from the position information providing devices 9a and 9b is different from the position information where the wireless terminals 1a and 1b exist, but the line between the position information providing devices 9a and 9b and the wireless terminals 1a and 1b. In the case of a wireless communication line such as a wireless LAN 10a, 10b, the position of the wireless terminals 1a, 1b is specified within a range where radio waves can reach from the position information providing devices 9a, 9b due to restrictions such as radio wave arrival distance. In other words, the wireless terminals 1a and 1b can be estimated from the position information providing devices 9a and 9b to exist at positions within a range that takes into account the GPS measurement error and the maximum radio wave reachable distance.
[0058]
In the third embodiment, the position information is acquired from the mobile position information providing devices 9a and 9b mounted on the vehicle or the like. However, the position information is installed in a traffic light, a power pole, a hot spot, etc. at a predetermined position. The position information may be acquired from the fixed position information providing apparatus via the wireless LANs 10a and 10b. In this case, the position information providing device does not need to have a function of calculating the position information by the radio wave from the GPS satellite 3, and may transmit the known fixed position information calculated in advance.
[0059]
In the third embodiment, the wireless LANs 10a and 10b using TCP are used. However, the wireless LANs 10a and 10b using UDP (User Datagram Protocol) may be used.
[0060]
As described above, according to the third embodiment, the same effects as those of the first or second embodiment can be obtained, and the wireless terminals 1a and 1b do not have to have a position information calculation function. An effect is obtained.
[0061]
Embodiment 4 FIG.
FIG. 14 is a diagram showing a configuration of a wireless communication system according to Embodiment 4 of the present invention. In the third embodiment, the wireless terminals 1a and 1b and the location information providing devices 9a and 9b are connected via the wireless LANs 10a and 10b. In the fourth embodiment, the wireless terminals 1a and 1b and the location information providing device 9a are connected. , 9b are connected by wired cables 11a, 11b, and other configurations are the same as those of the third embodiment.
[0062]
As the wired cables 11a and 11b, a USB (Universal Serial Bus) cable, an RS-232C cable, or the like is used. The cable length of the wired cables 11a and 11b is generally about several meters, and the communication range is limited to the range, so that the error from the position information acquired from the position information providing devices 9a and 9b becomes small.
[0063]
Further, it is assumed that the position information providing unit 43 of the position information providing devices 9a and 9b and the position information acquiring units 27 and 38 of the wireless terminals 1a and 1b are provided with a USB interface or an RS-232C interface.
[0064]
In the fourth embodiment, the position information is acquired from the mobile position information providing devices 9a, 9b mounted on the vehicle or the like. However, the position information is installed in a traffic light, a power pole, a hot spot, etc. at a predetermined position. Alternatively, the position information may be acquired from the fixed position information providing device via the wired cables 11a and 11b. In this case, the position information providing device does not need to have a function of calculating the position information by the radio wave from the GPS satellite 3, and may transmit the known fixed position information calculated in advance.
[0065]
As described above, according to the fourth embodiment, the same effect as in the third embodiment can be obtained.
[0066]
Embodiment 5 FIG.
The diagram showing the configuration of the radio communication system according to the fifth embodiment of the present invention is the same as the diagram showing the configuration of the radio communication system according to the second embodiment, that is, the same as FIG. 1 of the first embodiment.
[0067]
The uplink communication via the communication satellite 2 is an asymmetric link with a small uplink line bandwidth to the base station server 5 compared to the downlink communication from the base station server 5. For this reason, when data is simultaneously transmitted from a large number of wireless terminals 1a and 1b greater than the design value to the base station server 5, the data collides and an error occurs. However, the wireless communication system according to the fifth embodiment In the wireless communication system according to mode 2, congestion of the uplink communication line from the wireless terminals 1a and 1b to the base station server 5 is controlled.
[0068]
FIG. 15 is a diagram showing an example of a region-network prefix correspondence table showing correspondence between regions and network prefixes of interface IPv6 addresses set in the wireless terminals 1a and 1b as transmission sources. A network prefix as route information is assigned to the upper 64 bits of the IPv6 address, and as shown in FIG. 15, a network prefix is assigned corresponding to the region. This region-network prefix correspondence table is shared between the wireless terminals 1 a and 1 b and the base station server 5.
[0069]
FIG. 16 is a block diagram showing the internal configuration of the wireless terminals 1a and 1b. The wireless terminals 1a and 1b control the transmission of packets by determining the transmission suppression packet and the transmission suppression cancellation packet transmitted from the base station server 5 in the configuration of the wireless terminals 1a and 1b shown in FIG. 7 of the second embodiment. 15, for example, a region-network prefix correspondence table 52 shown in FIG. 15, an IP address setting unit 53 for setting an IP address, a transmission packet based on the set IP address, and a packet based on the control of the packet determination unit 51 Is added.
[0070]
Next, the operation will be described.
As in the second embodiment, it is assumed that the wireless terminals 1a and 1b participate in a multicast group corresponding to the current position. That is, the multicast address corresponding to the current position is stored in the multicast address storage unit 34.
[0071]
The base station server 5 monitors the congestion state of the uplink communication line via the communication satellite 2, and performs uplink communication manually or automatically when the uplink traffic exceeds the design allowable value due to a natural disaster or the like. Broadcast a transmission suppression packet for suppression to all regions.
[0072]
The wireless terminals 1a and 1b that have received the transmission suppression packet suppress uplink transmission. Thereafter, the base station server 5 transmits a transmission suppression release packet for releasing uplink communication suppression to a region where communication is preferentially permitted by a multicast address limited to the region shown in FIG. The suppression of the uplink communication of the wireless terminals 1a and 1b existing in the area of the transmitted multicast address is released. Such control is effective, for example, when priority is given to uplink communication from an area where a natural disaster such as an earthquake has occurred.
[0073]
FIG. 17 is a flowchart showing a processing flow of the wireless terminals 1a and 1b. In step ST41, when the packet receiving unit 35 receives the packet transmitted from the base station server 5, and the packet determining unit 51 determines that the received packet is a broadcast transmission suppression packet, in step ST42, packet transmission is performed. The unit 54 stops the packet transmission to the base station server 5 based on the control of the packet determination unit 51.
[0074]
In step ST43, the packet reception unit 35 receives the packet transmitted from the base station server 5, and the packet received by the packet determination unit 51 is a transmission suppression release packet for releasing the uplink communication suppression that has been multicast. Determine.
[0075]
In step ST44, the packet determination unit 51 confirms whether the multicast address shown in FIG. 6 added to the header of the transmission suppression release packet matches the multicast address stored in the multicast address storage unit 34. Then, it is determined whether the received transmission suppression release packet is a packet transmitted to the wireless terminals 1a and 1b existing in the area.
[0076]
If the multicast addresses do not match and the received transmission suppression cancellation packet is not a packet transmitted to the wireless terminals 1a and 1b existing in the area, the process returns to step ST42 to continue the packet transmission stop state. On the other hand, if the multicast addresses match and the received transmission suppression cancellation packet is a packet transmitted to the wireless terminals 1a and 1b existing in the area, the packet determination unit 51 cancels the packet transmission suspension in step ST45. To do.
[0077]
In step ST46, the IP address setting unit 53 corresponds to the calculated position information to the upper 64 bits of the IPv6 address by using the position information calculated by the position information calculating unit 31 and the region-network prefix correspondence table 52 shown in FIG. A network prefix is assigned, and the IP address of the transmission source is set by assigning the MAC (Media Access Control) address of the card or the card serial number that guarantees uniqueness within the divided area to the lower 64 bits.
[0078]
In step ST47, the packet transmission unit 54 generates a packet to which the IP address of the transmission source is added, and transmits the generated packet to the base station server 5 via the communication satellite 2.
[0079]
FIG. 18 is a flowchart showing a detailed flow of the IP address setting process of step ST46 of FIG. In step ST51, the IP address setting unit 53 acquires the current latitude / longitude position information calculated by the position information calculation unit 31. In step ST52, the IP address setting unit 53 refers to the region-network prefix correspondence table 52 shown in FIG. 15 to obtain the existing region from the acquired current latitude / longitude position information. For example, Tokyo-Otemachi is determined as the existing area based on the acquired current latitude / longitude position information.
[0080]
In step ST53, the IP address setting unit 53 refers to the region-network prefix correspondence table 52, and obtains the upper 64 bits of the network prefix of the IPv6 address from the existing region. For example, “fec0: 0: 0001: 0002 :: / 64” is obtained as a network prefix corresponding to Tokyo-Otemachi.
[0081]
In step ST54, the IP address setting unit 53 generates the lower 64 bits of the interface ID of the IPv6 address based on the MAC address of the card or the card serial number that is guaranteed to be unique within the existing area. For example, when the MAC address of the card is “00: 80: c8: 69: 59: 91 (hexadecimal number)”, “280: c8ff: fe69: 5991” and the interface ID are obtained by converting the EUI-64 format. Can be generated.
[0082]
This example is an example of a LAN card, but if the original ID is unique, it is easy to generate an interface ID by performing the same mapping conversion. Alternatively, the interface ID may be generated by a method in which random numbers are generated using the time as a seed and the uniqueness is guaranteed stochastically.
[0083]
In step ST55, the IP address setting unit 53 combines the network prefix and the interface ID to generate an IP address (128-bit IPv6 address). In the above example, the network prefix “fec0: 0: 0001: 0002” and the interface ID “280: c8ff: fe69: 5991” are combined, and the IP (v6) address “fec0: 0: 0001: 0002: 280: c8ff” is combined. : Fe69: 5991 ". This is set as an IP (v6) address in the terminal I / F of the wireless terminals 1a and 1b.
[0084]
In such uplink communication line congestion control, the uplink deterrence control is not performed for the wireless terminals 1a and 1b activated after the transmission deterrence packet is transmitted by broadcast. Control may be performed so as to suppress transmission from the wireless terminals 1a and 1b other than the preferential area by transmitting a transmission suppression packet at predetermined intervals by limited multicast.
[0085]
When there are many divided areas, transmission of a transmission suppression packet by such a method increases waste of the downlink line, but as shown in FIG. 6, the areas are divided into large and small sections. If the resolution level is defined separately, a transmission suppression packet can be transmitted efficiently.
[0086]
For example, as shown in FIG. 6, the area ID “0001” is associated with the Kanto area, “0002” is the Nagoya area, “00010001” is the Tokyo station area, and “00010002” is the Tokyo / Otemachi area. In addition, if it is desired to transmit a control signal to the entire Kanto region, if the multicast address is specified as “ff02 :: 10: 0001: ffff: 114” and a transmission suppression packet is transmitted, the wireless terminals 1a and 1b in the entire Kanto region are transmitted. It is possible to transmit a transmission suppression packet in one transmission.
[0087]
In the fifth embodiment, the wireless terminals 1a and 1b receive the radio wave from the GPS satellite 3 and calculate the position information. However, as shown in the third or fourth embodiment, the wireless terminals 1a and 1b 1b may acquire the position information from the position information providing device 9.
[0088]
As described above, according to the fifth embodiment, when the uplink communication line is congested, the base station server 5 grants uplink communication permission to the radio terminals 1a and 1b existing in the limited area. By controlling uplink traffic, for example, it is possible to give priority to uplink communication from an area where a disaster has occurred, and to suppress frequent occurrence of errors due to congestion.
[0089]
Embodiment 6 FIG.
FIG. 19 is a diagram showing a configuration of a wireless communication system according to Embodiment 6 of the present invention. This wireless communication system is connected to the network 12 such as a WAN connected to the router 6 in the configuration of the communication system according to the fifth embodiment, that is, the configuration of FIG. 1 of the wireless communication system according to the first embodiment. The network management device 14 connected to the emergency information management centers 13a and 13b and the router 6 installed in the areas A and B via the LAN 7 is added.
[0090]
Further, the block diagram showing the internal configuration of the radio terminals 1a and 1b is the same as that of FIG. In the sixth embodiment, when uplink communication is performed from the wireless terminals 1a and 1b via the communication satellite 2 to the base station server 5, packet transfer is controlled based on the IP addresses of the transmission sources of the wireless terminals 1a and 1b. Is.
[0091]
Next, the operation will be described.
FIG. 20 is a flowchart showing the flow of processing for packet transfer control. In step ST61, the wireless terminals 1a and 1b generate a source IP address, generate a packet, and transmit the packet to the base station server 5 via the communication satellite 2 in order to perform uplink communication. At this time, the IP address is generated by the process shown in FIG. 18 of the fifth embodiment.
[0092]
In step ST62, the base station server 5 determines from which region the packet is transmitted by confirming the network prefix of the IP address of the transmission source of the wireless terminals 1a and 1b.
[0093]
In step ST63, the base station server 5 converts the IP address of the packet transmission destination into the IP address of the corresponding emergency call management center 13a, 13b corresponding to the determined area, and transfers the packet. For example, in the case of a system in which the jurisdiction is determined for each area such as a fire department or a police station, it is necessary to transfer to an appropriate jurisdiction, so the destination IP address is rewritten to the corresponding jurisdiction and transferred.
[0094]
In addition, the router 6 investigates the IP address of the transmission source of the uplink communication, plots the traffic amount statistics for each region as a MIB (Management Information Base) value, and stores it in the memory in the router 6. This MIB value is, for example, the number of IN / OUT packets, the number of IN / OUT bytes, and the like, and is updated each time uplink communication is performed.
[0095]
Then, the network management device 14 reads the MIB value stored in the memory in the router 6 every predetermined time by a management protocol such as SNMP (Simple Network Management Protocol), and collects it as a traffic statistics for every predetermined time. And analyze.
[0096]
As described above, according to the sixth embodiment, the base station server 5 confirms the network prefix of the IP address of the transmission source of the wireless terminals 1a and 1b and determines from which region the packet is transmitted. Then, by converting the IP address of the packet destination to the IP address of the corresponding emergency call management center 13a, 13b and transferring the packet, only the header part is confirmed without confirming the data part of the packet Thus, an effect that the packet transfer processing can be efficiently performed is obtained.
[0097]
For example, in a general emergency call system, the exact location of the wireless terminals 1a and 1b cannot be specified unless the location information is inserted into the data portion of the packet. However, the IP address of the transmission source is determined based on the location information of latitude and longitude. By assigning numbers, processing such as transferring information to the emergency call management centers 13a and 13b having jurisdiction over the respective regions can be facilitated, and an effect that quick response is possible is obtained.
[0098]
Also, the router 6 stores the traffic statistics for each region in the memory as MIB values, and the network management device 14 uses the management protocol such as SNMP to set the MIB values stored in the memory in the router 6 at predetermined intervals. By reading, collecting and analyzing, there is an effect that statistical processing and analysis processing such as from which area the communication amount to the base station server 5 is large can be performed.
[0099]
In the wireless communication system according to the first to sixth embodiments, downlink and uplink communications are performed via the communication satellite 2. However, the present invention is applicable to a wireless communication system not via the communication satellite 2. Applicable.
[0100]
【The invention's effect】
As described above, according to the present invention, the distribution server that adds the range information indicating the range of the region to the data related to each region and distributes it by multicast or broadcast, and the acquired location information and the distributed data A wireless terminal that selects data related to the region in which it exists from data related to each region distributed in a batch based on the range information added to the The data related to each area where the wireless terminal exists can be efficiently selected from the data related to each area distributed collectively by the type or the broadcast type.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a wireless communication system according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing an internal configuration of a wireless terminal according to Embodiment 1 of the present invention.
FIG. 3 is a diagram showing an example of data distributed by a distribution server of the wireless communication system according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing a process flow of the wireless terminal according to the first embodiment of the present invention.
FIG. 5 is a diagram showing a field format of a multicast address of an IP protocol in a wireless communication system according to a second embodiment of the present invention.
FIG. 6 is a diagram showing an example of a region-multicast address correspondence table in the wireless communication system according to the second embodiment of the present invention.
FIG. 7 is a block diagram showing an internal configuration of a radio terminal according to Embodiment 2 of the present invention.
FIG. 8 is a flowchart showing a processing flow of a wireless terminal according to the second embodiment of the present invention.
FIG. 9 is a diagram showing a configuration of a wireless communication system according to a third embodiment of the present invention.
FIG. 10 is a block diagram showing an internal configuration of a position information providing apparatus for a wireless communication system according to Embodiment 3 of the present invention;
FIG. 11 is a block diagram showing an internal configuration of a wireless terminal according to Embodiment 3 of the present invention.
FIG. 12 is a block diagram showing an internal configuration of a radio terminal according to Embodiment 3 of the present invention.
FIG. 13 is a flowchart showing a process flow of the position information providing apparatus of the wireless communication system according to the third embodiment of the present invention.
FIG. 14 is a diagram showing a configuration of a wireless communication system according to a fourth embodiment of the present invention.
FIG. 15 is a diagram showing a region-network prefix correspondence table in the wireless communication system according to the fifth embodiment of the present invention.
FIG. 16 is a block diagram showing an internal configuration of a wireless terminal according to the fifth embodiment of the present invention.
FIG. 17 is a flowchart showing a process flow of a wireless terminal according to the fifth embodiment of the present invention.
FIG. 18 is a flowchart showing a detailed flow of IP address setting processing of a wireless terminal according to the fifth embodiment of the present invention.
FIG. 19 is a diagram showing a configuration of a wireless communication system according to a sixth embodiment of the present invention.
FIG. 20 is a flowchart showing a flow of a packet transfer control process in the wireless communication system according to the sixth embodiment of the present invention.
[Explanation of symbols]
1a, 1b wireless terminal, 2 communication satellite, 3 GPS satellite, 4 satellite base station, 5 base station server, 6 router, 7 LAN, 8 distribution server, 9a, 9b location information providing device, 10a, 10b wireless LAN, 11a, 11b Wired cable, 12 networks, 13a, 13b Emergency information management center, 14 network management device, 21 location information calculation unit, 22 location information storage unit, 23 data reception unit, 24 data interpretation unit, 25 data block selection unit, 26 data Block display unit, 27 position information acquisition unit, 31 position information calculation unit, 32 region-multicast address correspondence table, 33 multicast address acquisition unit, 34 multicast address storage unit, 35 bucket reception unit, 36 packet selection unit, 37 data display unit 38 Location information acquisition unit, 41 Location information performance Parts, 42 position information storage unit, 43 position information providing unit, 51 packet determining unit, 52 regions - network prefix correspondence table, 53 IP address setting unit, 54 a packet transmission unit.

Claims (20)

In a wireless communication system that distributes data related to each region to each region by multicast or broadcast,
A distribution server that adds range information indicating the range of the region to data related to each region and distributes the data by multicast or broadcast; and
Based on the acquired location information and range information added to the distributed data, select the data related to the region where the user exists from the data related to each region distributed in a lump. A wireless communication system comprising: a wireless terminal that performs: The delivery server delivers a range tag with latitude and longitude as range information,
The wireless terminal selects data related to the area in which the wireless terminal exists based on the acquired position information and the latitude and longitude described in the distributed range tag. Wireless communication system. The distribution server adds a multicast address corresponding to each region as range information and distributes it,
The wireless terminal acquires a multicast address corresponding to each region from the acquired location information, and based on the acquired multicast address and the multicast address corresponding to each region as distributed range information, the region where the wireless terminal exists The wireless communication system according to claim 1, wherein data related to the data is selected. 2. The wireless communication system according to claim 1, wherein the wireless terminal receives radio waves from a GPS (Global Positioning System) satellite and calculates and acquires position information. A position information providing device that receives radio waves from a GPS satellite, calculates position information, and provides the calculated position information;
The wireless communication system according to claim 1, wherein the wireless terminal acquires position information from a position information providing device existing in the area. 6. The wireless communication system according to claim 5, wherein the wireless terminal acquires position information from the position information providing apparatus via a wireless LAN. 6. The wireless communication system according to claim 5, wherein the wireless terminal acquires position information from the position information providing device via a wired cable. A base station server that transmits data from the distribution server to the wireless terminal;
The wireless terminal receives the transmission suppression packet broadcast from the base station server and stops transmitting uplink packets to the base station server, and a multicast address corresponding to a limited area is added from the base station server. The transmission suppression cancellation packet is received, and based on the multicast address added to the transmission suppression cancellation packet and the acquired multicast address, the uplink transmission suspension to the base station server is canceled and the packet is transmitted. The wireless communication system according to claim 3. The wireless terminal obtains the area where the wireless terminal is present from the acquired location information, obtains a network prefix of the IP protocol corresponding to the area, and synthesizes the network prefix and a unique interface ID in the area. 9. The wireless communication system according to claim 8, wherein an IP address of a transmission source is generated, and the generated IP address is added to a header to transmit an uplink packet to the base station server. Equipped with emergency information management center for each region,
The base station server forwards the packet to the emergency information management center corresponding to the area where the wireless terminal exists based on the IP address of the transmission source added to the header of the packet transmitted from the wireless terminal. The wireless communication system according to claim 9. A router that transmits data from the distribution server to the base station server;
A network management device connected to the router,
The router investigates the IP address of the uplink transmission source, stores the traffic statistics for each region as a MIB (Management Information Base) value, and the network management device manages SNMP (Simple Network Management Protocol) or the like. 11. The wireless communication system according to claim 10, wherein the MIB value stored in the router is read out every predetermined time by a protocol, and is collected and analyzed as a traffic statistics for every predetermined time. In a distribution server that distributes data related to each region to each region by multicast or broadcast,
Latitude / longitude as range information indicating the range of the region in the data related to each region so that the wireless terminal that is present in each region and has acquired its location information can select the data related to the region to which it was distributed A distribution server characterized by adding a range tag described in 1. In a distribution server that distributes data related to each region to each region by multicast or broadcast,
In order to be able to select the data related to the area where the wireless terminal that is present in each area and has acquired its own location information can be selected, the data related to each area is displayed as range information indicating the range of the area. A distribution server characterized by adding a corresponding multicast address for distribution. In a wireless terminal that receives data related to each region distributed to each region by multicast or broadcast,
Based on the acquired location information and range information indicating the range of the region added to the distributed data, select the data related to the region where the user exists from the data distributed at once. A wireless terminal characterized by 15. The data related to the area where the user is present is selected based on the acquired position information and latitude / longitude as range information described in the distributed range tag. Wireless terminal. Acquire a multicast address corresponding to each region from the acquired location information, and based on the acquired multicast address and the multicast address corresponding to each region as the distributed range information, data related to the region in which it exists The wireless terminal according to claim 14, wherein the wireless terminal is selected. The wireless terminal according to claim 14, wherein the wireless terminal receives radio waves from a GPS satellite and calculates and acquires position information. The wireless terminal according to claim 14, wherein the position information is acquired from a position information providing device that receives radio waves from a GPS satellite, calculates position information, and provides the calculated position information. Stops transmission of uplink packets to the base station server upon receiving a transmission suppression packet broadcast from the base station server, and cancels transmission suppression to which a multicast address corresponding to a limited area is added from the base station server Receiving a packet, and canceling the uplink transmission suspension to the base station server based on the multicast address added to the transmission suppression cancellation packet and the acquired multicast address, and transmitting the packet, The wireless terminal according to claim 16. From the acquired location information, find the region where the device is located, obtain the network prefix of the IP protocol corresponding to the region, combine the network prefix and the unique interface ID in the region, 20. The wireless terminal according to claim 19, wherein the wireless terminal generates an IP address, adds the generated IP address to a header, and transmits an uplink packet to the base station server.

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