JP5609088B2 - DATA DISTRIBUTION SYSTEM, DATA DISTRIBUTION DEVICE, DATA DISTRIBUTION METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to a data distribution technique for distributing data such as video data from a data distribution device to a mobile terminal device via a wireless line.

  Video data, audio data, etc. are distributed from a data distribution device to a portable terminal device such as a mobile phone, a notebook personal computer, and an in-vehicle device via a wireless line, and video is transmitted according to the transmitted data in the portable terminal device. Conventionally, data distribution systems that play back voices and voices have been known. A problem in such a data distribution system is that it is difficult to always secure a transmission path between the data distribution apparatus and the mobile terminal apparatus. For example, the transmission path is cut while the mobile terminal device is moving in a section where radio waves do not reach (communication impossible section) such as in a tunnel. If the transmission line is cut off, the reproduction of the video data and the like is interrupted, giving the user an unpleasant feeling.

  As a technique for solving such a problem, the following technique is known (for example, see Patent Document 1).

  The portable terminal device includes a position detection unit that detects the current position of the terminal device, and a route calculation unit that calculates route information to the destination. Then, when requesting data distribution to the data distribution apparatus, the mobile terminal apparatus uses the position information indicating the current position detected by the position detection means and the route information calculated by the route calculation means to the data distribution apparatus. Send to. Thereafter, the mobile terminal device transmits the position information and the route information to the data distribution device at regular time intervals.

  The data distribution device includes communication status prediction means for predicting the communication status of the destination of the mobile terminal device based on the location information and route information sent from the mobile terminal device. Every time route information is sent, the communication status prediction means is used to estimate the communication status of the destination of the mobile terminal device. When the communication status is predicted to improve, the transmission ratio of the high frequency component in the video data to be distributed is increased. On the other hand, when the deterioration of the communication status is predicted, the distribution ratio of the low frequency component in the video data to be distributed is increased. For example, if there is a tunnel on the route of the mobile terminal device and the communication situation is expected to deteriorate, video data will be continuously played back without interruption as much as possible in consideration of the distance to the tunnel and the length of the tunnel. As described above, the transmission ratio of the low frequency component in the video data is increased. By increasing the transmission ratio of low frequency components, video data to be played back in the tunnel can be buffered in the buffer of the mobile terminal device before the mobile terminal device enters the tunnel. Video can be played without interruption.

JP 2006-197453 A

  According to the technique described in Patent Document 1, even when the mobile terminal device is moving in a non-communication zone such as in a tunnel, it is possible to reproduce video without interruption for a long time. However, since the technique described in Patent Literature 1 needs to transmit route information to the destination and current position information from the mobile terminal device to the data distribution device, the route information calculation function is provided. There is a problem that it cannot be applied to a portable terminal device that is not provided. That is, a portable terminal device that does not have a route information calculation function has a problem that data cannot be reproduced without interruption in an incommunicable section such as in a tunnel.

[Object of the invention]
Therefore, an object of the present invention is that a portable terminal device that does not have a route information calculation function for calculating route information to a destination cannot reproduce data without interruption in an incommunicable section such as in a tunnel. The object is to provide a data distribution system that solves the problems.

A first data distribution system according to the present invention includes:
A portable terminal device and a data distribution device;
The portable terminal device
Position detecting means for detecting the current position of the own device;
Location information for transmitting a route recording request including location information of the current location detected by the location detection means to the data distribution device every time a route recording request is transmitted when recording a user's movement route A transmission means;
A reception buffer for temporarily storing data distributed from the data distribution device;
At the time of a data distribution request, a data distribution request including the position information of the current position detected by the position detection unit and the buffer size of the reception buffer is transmitted to the data distribution apparatus, and the data distribution request is responded And reproducing means for reading and reproducing data from the reception buffer according to the reproduction bit rate sent from the data distribution device,
The data distribution device includes:
A route table;
For each route record request sent from the mobile terminal device, the position information included in the route record request is recorded in the route table, and the position information is associated with each position information recorded in the route table. The network bandwidth information when the information is sent, the movement time from the position indicated by the position information to the position indicated by the position information sent immediately before or after the position information, and the position A boundary flag indicating whether or not a communication impossible section where radio waves do not reach is recorded between the position indicated by the information and the position indicated by the position information sent immediately before or after the position information. Route recording means;
A first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal device to reach the incommunicable section, and the first time required for passing through the incommunicable section Required time calculating means for calculating the required time of 2 based on the contents of the route table;
First and second required times calculated by the required time calculating means, a buffer size in a data distribution request sent from the portable terminal device, network bandwidth information and travel time recorded in the route table And determining the reproduction bit rate of the data to be distributed to the mobile terminal device, transmitting the determined reproduction bit rate to the mobile terminal device, and based on the network bandwidth information recorded in the route table Distribution means for determining a distribution bit rate of data to be distributed to the portable terminal device and distributing data to the portable terminal device at the determined distribution bit rate.

The first data distribution apparatus according to the present invention is:
Position detection means for detecting the current position of the device itself, and path recording including position information of the current position detected by the position detection means each time when a route recording request is transmitted at the time of recording a user's movement route Position information transmitting means for transmitting a request to the data distribution apparatus, a reception buffer for temporarily storing data distributed from the data distribution apparatus, and detected by the position detection means at the time of data distribution request A data distribution request including the position information of the current position and the buffer size of the reception buffer is transmitted to the data distribution apparatus, and according to the reproduction bit rate sent from the data distribution apparatus in response to the data distribution request A data distribution system comprising a portable terminal provided with a reproducing means for reading out and reproducing data from the reception buffer, and a data distribution apparatus A data distribution apparatus, which is a component of the beam,
A route table;
For each route record request sent from the mobile terminal device, the position information included in the route record request is recorded in the route table, and the position information is associated with each position information recorded in the route table. The network bandwidth information when the information is sent, the movement time from the position indicated by the position information to the position indicated by the position information sent immediately before or after the position information, and the position A boundary flag indicating whether or not a communication impossible section where radio waves do not reach is recorded between the position indicated by the information and the position indicated by the position information sent immediately before or after the position information. Route recording means;
A first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal device to reach the incommunicable section, and the first time required for passing through the incommunicable section Required time calculating means for calculating the required time of 2 based on the contents of the route table;
First and second required times calculated by the required time calculating means, a buffer size in a data distribution request sent from the portable terminal device, network bandwidth information and travel time recorded in the route table And determining the reproduction bit rate of the data to be distributed to the mobile terminal device, transmitting the determined reproduction bit rate to the mobile terminal device, and based on the network bandwidth information recorded in the route table Distribution means for determining a distribution bit rate of data to be distributed to the portable terminal device and distributing data to the portable terminal device at the determined distribution bit rate.

A first data distribution method according to the present invention includes:
When the location information transmission means of the mobile terminal device records the movement route of the user, every time it becomes the transmission timing of the route recording request, the route recording request including the location information of the own device is transmitted to the data distribution device,
The route recording means of the portable terminal device records the position information included in the route recording request for each route recording request sent from the portable terminal device in the route table and records it in the route table. In association with each position information, the network bandwidth information when the position information is sent and the position information sent one before or after the position information from the position indicated by the position information indicate Whether the interval between the travel time to the location and the location indicated by the location information and the location indicated by the location information sent one before or after the location information is a non-communication zone where radio waves do not reach Record a boundary flag indicating whether or not
The reproduction means of the portable terminal device includes position information indicating the current position of the device itself when data distribution is requested, and a buffer size of a reception buffer for temporarily storing data distributed from the data distribution device. A data distribution request to the data distribution device,
The required time calculation means of the data distribution device includes a first required time until the communication impossible section is reached from the position indicated by the position information in the data distribution request sent from the portable terminal device, and the communication failure. Calculating a second required time required to pass through the possible section based on the contents of the route table;
The distribution means of the data distribution device records the first and second required times calculated by the required time calculation means, the buffer size in the data distribution request sent from the portable terminal device, and the route table. Based on the network bandwidth information and the travel time, the playback bit rate of data to be distributed to the mobile terminal device is determined, the determined playback bit rate is transmitted to the mobile terminal device, and the routing table Determining a delivery bit rate of data to be delivered to the mobile terminal device based on the recorded network bandwidth information, delivering data to the mobile terminal device at the determined delivery bit rate,
The reproduction means of the portable terminal device reads and reproduces data from the reception buffer according to the bit rate transmitted from the data distribution device in response to the data distribution request.

The first program according to the present invention is:
Position detection means for detecting the current position of the device itself, and path recording including position information of the current position detected by the position detection means each time when a route recording request is transmitted at the time of recording a user's movement route Position information transmitting means for transmitting a request to the data distribution apparatus, a reception buffer for temporarily storing data distributed from the data distribution apparatus, and detected by the position detection means at the time of data distribution request A data distribution request including the position information of the current position and the buffer size of the reception buffer is transmitted to the data distribution apparatus, and according to the reproduction bit rate sent from the data distribution apparatus in response to the data distribution request A data distribution system comprising a portable terminal provided with a reproducing means for reading out and reproducing data from the reception buffer, and a data distribution apparatus The data delivery device which is a component of the beam, a program for implementing by a computer having a routing table,
The computer,
For each route record request sent from the mobile terminal device, the position information included in the route record request is recorded in the route table, and the position information is associated with each position information recorded in the route table. The network bandwidth information when the information is sent, the movement time from the position indicated by the position information to the position indicated by the position information sent immediately before or after the position information, and the position A boundary flag indicating whether or not a communication impossible section where radio waves do not reach is recorded between the position indicated by the information and the position indicated by the position information sent immediately before or after the position information. Route recording means,
A first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal device to reach the incommunicable section, and the first time required for passing through the incommunicable section Required time calculation means for calculating the required time of 2 based on the contents of the route table;
First and second required times calculated by the required time calculating means, a buffer size in a data distribution request sent from the portable terminal device, network bandwidth information and travel time recorded in the route table And determining the reproduction bit rate of the data to be distributed to the mobile terminal device, transmitting the determined reproduction bit rate to the mobile terminal device, and based on the network bandwidth information recorded in the route table And determining a distribution bit rate of data to be distributed to the portable terminal device, and functioning as distribution means for distributing data to the portable terminal device at the determined distribution bit rate.

  According to the present invention, even a portable terminal device with an economical configuration that does not have a route information calculation function for calculating route information to a destination can be transmitted from a data distribution device in a communication impossible section such as in a tunnel. The distributed data can be reproduced without interruption.

It is a block diagram which shows the example of whole structure of 1st Embodiment of the data delivery system concerning this invention. 2 is a block diagram illustrating a configuration example of a mobile terminal 100. FIG. 3 is a block diagram illustrating a configuration example of a video distribution device 200. FIG. 5 is a diagram illustrating an example of a route table 261. FIG. It is a figure which shows an example of the station table 262. It is a figure which shows an example of the bus stop table 263. It is a figure which shows an example of the train timetable table 264. It is a figure which shows an example of the bus timetable table 265. It is a figure which shows an example of the train delay table. It is a figure which shows an example of the road traffic congestion table 267. It is a flowchart which shows the process example at the time of path | route information recording. 3 is a diagram illustrating an example of contents of a main memory 220. FIG. It is a flowchart which shows a part of process example at the time of data delivery. It is a flowchart which shows the other part of the example of a process at the time of data delivery. It is a flowchart which shows the remaining part of the example of a process at the time of data delivery. It is a block diagram which shows the structural example of 2nd Embodiment of the data delivery system concerning this invention.

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

[First embodiment of the present invention]
Referring to FIG. 1, a first embodiment of a data distribution system according to the present invention is a portable terminal device (sometimes simply referred to as a portable terminal) 100 such as a mobile phone or a notebook personal computer, and distribution of video data. A video distribution device 200, a radio base station 300, a GPS (Global Positioning System) satellite 500, a delay information management device 600 that manages rail delay information, and a traffic jam that manages road traffic jam information. And an information management apparatus 700. The mobile terminal 100 and the video distribution device 200 are connected to each other via the radio base station 300 and the communication path 400. In addition, the video distribution apparatus 200, the delay information management apparatus 600, and the traffic jam information management apparatus 700 are connected to each other via a communication path 400.

  When the delay information indicating the name of the route in which the delay has occurred and the delay information indicating the degree of delay are input by the administrator, the delay information management device 600 transmits a delay table registration request including them to the video distribution device 200 for management. When a route name of a route whose delay has been eliminated is input by the user, the delay table deletion request including the route name is transmitted to the video distribution apparatus 200.

  When the administrator inputs the road name of the road where the traffic jam occurred and the delay information indicating the degree of delay, the traffic jam information management device 700 transmits a traffic jam table registration request including them to the video distribution device 200 for management. When a person inputs a road name of a road whose congestion has been eliminated, the user has a function of transmitting a congestion table deletion request including the road name to the video distribution apparatus 200.

Referring to FIG. 2, the mobile terminal 100 includes a CPU (Central
Processing Unit) 110, main memory 120, program memory 130, audio output unit 140, speaker 141, display unit 150, monitor 151 such as an LCD (Liquid Crystal Display), wireless communication unit 160, antenna 161, a key input unit 170, an operation key unit 171 provided with ten keys, function keys, operation buttons, and the like, a reception buffer 180, a GPS control unit 190, and a GPS antenna 191.

  The radio communication unit 160 has a function of transmitting / receiving data to / from the radio base station 300 via the antenna 161.

  The GPS control unit 190 functions as a position detection unit that detects the current position of the terminal 100, receives a signal from the GPS satellite 500 via the GPS antenna 191, and determines the terminal 100 based on the received signal. It has a function of detecting the current position.

  The reception buffer 180 temporarily stores the video data sent from the video distribution device 200.

  In the program memory 130, a position information transmission program 131 and a video reproduction program 132 executed by the CPU 110 are recorded.

  The position information transmission program 131 functions as a position information transmission unit, and is triggered by a press of a recording button (not shown) provided on the operation key unit 171 by the user at a predetermined timing. The position information indicating the current position of the terminal 100 is acquired from the GPS control unit 190 (for example, at a constant interval), and a route recording request including the acquired position information is transmitted via the wireless control unit 160 to the video distribution device 200. It has a function to transmit to.

  The video playback program 132 functions as playback means, and is triggered by the user pressing a viewing start button (not shown) provided in the operation key unit 171 to the video distribution apparatus 200. And a function of transmitting a data distribution request. The data distribution request includes two pieces of position information input from the GPS control unit 190 with a slight time interval and the buffer size of the reception buffer 180. Here, the reason why the two pieces of position information are included in the data distribution request is that the video distribution apparatus 200 moves the user (mobile terminal 100) in the moving direction based on the two pieces of position information when receiving the data reproduction request. This is so that it can be recognized. Therefore, the time interval when inputting the two pieces of position information from the GPS control unit 190 is a time interval that makes a difference between the two pieces of position information even when the user is walking. It is necessary to. The buffer size of the reception buffer 180 is recorded in a predetermined storage area in the mobile terminal 100, and the video reproduction program 132 inputs the buffer size from the predetermined storage area.

  Furthermore, the video playback program 132 takes out video data from the reception buffer 180 at a playback bit rate instructed from the video distribution device 200, plays a video, and plays a predetermined timing (eg, The position information is acquired from the GPS control unit 190 every fixed time or every time a predetermined number of packets are received), and a position notification including the acquired position information is transmitted to the video distribution apparatus 200.

  Referring to FIG. 3, the video distribution apparatus 200 includes a CPU 210, a main memory 220, a program memory 230, a communication unit 240, a video file storage unit 250, and a database 260 configured on a recording medium such as a disk. And.

  The communication unit 240 has a function of transmitting / receiving data to / from the radio base station 300, the delay information management device 600, and the traffic jam information management device 700 via the communication path 400.

  The video file storage unit 250 stores video data to be distributed.

  In the database 260, a route table 261, a station table 262, a bus stop table 263, a train timetable table 264, a bus timetable table 265, a train delay table 266, and a road congestion table 267 are recorded.

  In the route table 261, information (route information) related to a travel route (for example, a travel route used for commuting or school) that is frequently used by the user of the mobile terminal 100 is recorded. FIG. 4 is a diagram illustrating an example of the route table 261. Referring to the figure, the route table 261 includes items “section ID”, “travel time”, “latitude”, “longitude”, “NW (network) bandwidth information”, “transportation means”, “station / bus stop”, “route”, and “boundary flag”. ”Is stored.

  The section ID is an ID that identifies a section on the movement route. In the present embodiment, one section is defined from the point indicated by the position information in the route record request received this time to the point indicated by the position information in the next received route record request. Latitude and longitude indicate the position of the start point of the corresponding section. The travel time indicates the travel time from the start point of the previous section to the start point of the corresponding section. For example, the travel time “60” recorded in association with the section ID “0003” is “60 seconds” for moving from the start point of the section with the section ID “0002” to the start point of the section with the section ID “0003”. This is shown. The NW band information represents the maximum transfer amount per unit time in the corresponding section. For example, “1000” recorded in association with the section ID “0001” indicates that data of a maximum of 1000 kbit can be transferred per second. The moving means indicates which moving means the user has used within the corresponding section, such as walking, bus or train. In the station / bus stop, when the starting point of the corresponding section is a station or a bus stop, a station ID or a bus stop ID for specifying the station or the bus stop is set. A route name is set in the route when the moving means in the corresponding section is a train or a bus. The boundary flag indicates whether or not the start point of the corresponding section can be regarded as an entrance or an exit of an incommunicable section where radio waves do not reach. In the present embodiment, the boundary flag is set to “1” when it can be regarded as the entrance or exit of the communication impossible section, and the boundary flag is set to “0” when it cannot be seen.

  In the station table 262, information indicating the existence range of each station is recorded. FIG. 5 is a diagram illustrating an example of the station table 262. Referring to the figure, the station table 262 records a plurality of records including items “station ID”, “latitude 1”, “longitude 1”, “latitude 2”, and “longitude 2”. The station ID is an ID that identifies a station. Latitude 1 and longitude 1 indicate the latitude and longitude of the upper left point of the station when the shape of the station is approximated by a rectangle. Latitude 2 and longitude 2 indicate the latitude and longitude of the lower right point of the station when the shape of the station is approximated by a rectangle.

  In the bus stop table 263, information indicating the existence range of each bus stop is recorded. FIG. 6 is a diagram illustrating an example of the bus stop table 263. Referring to the figure, the bus stop table 263 records a plurality of records including the items “bus stop ID”, “latitude 1”, “longitude 1”, “latitude 2”, and “longitude 2”. The bus stop ID is an ID that identifies the bus stop. Latitude 1 and longitude 1 indicate the latitude and longitude of the upper left point of the bus stop when the bus stop shape is approximated by a rectangle. Latitude 2 and longitude 2 indicate the latitude and longitude of the lower right point of the bus stop when the shape of the bus stop is approximated by a rectangle.

  A train timetable is recorded in the train timetable table 264. FIG. 7 is a diagram illustrating an example of the train timetable table 264. Referring to the figure, the train timetable table 264 records a plurality of records including the items “train ID”, “route”, “station ID”, “arrival time”, and “departure time”. The items “station ID”, “arrival time”, and “departure time” appear repeatedly in the record. Train ID is ID which specifies a train. A route name is set for the route. The arrival time and departure time indicate the arrival and departure times of the train at the station specified by the station ID paired therewith.

  A bus timetable is recorded in the bus timetable table 265. FIG. 8 is a diagram illustrating an example of the bus timetable table 265. Referring to the figure, the bus timetable table 265 records a plurality of records including items “bus ID”, “route”, “bus stop ID”, “arrival time”, “departure time”, and “passing road”. The items “bus stop ID”, “arrival time”, “departure time”, and “passing road” appear repeatedly in the record. The bus ID is an ID that identifies the bus. A route name is set for the route. The arrival time and departure time indicate the arrival and departure times of the bus at the bus stop specified by the bus stop ID paired therewith. A road name is set for the passing road.

  In the train delay table 266, route delay information is recorded. FIG. 9 is a diagram illustrating an example of the train delay table 266. Referring to the figure, in the train delay table 266, the route name of the route and the delay information on the route are recorded. The delay information indicates in percentage how much the required time is increased as compared to normal operation.

  The road congestion table 267 stores road delay information. FIG. 10 is a diagram illustrating an example of the road traffic jam table 267. Referring to the figure, the road congestion table 267 records road names of roads and delay information on the roads. The delay information indicates, as a percentage, how much the required time is increased compared to the case where there is no traffic jam.

  In the program memory 230, a route recording program 231 executed by the CPU 210, a required time calculation program 232, a video distribution program 233, and a delay management program 234 are recorded.

  The route recording program 231 functions as route recording means, and transmits location information in the route recording request sent from the mobile terminal 100, NW band information measured when the route recording request is received, and transmission of the route recording request. Based on the date and time (or reception date and time) and the contents of the tables 262 to 267, the required time, latitude, longitude, NW band information, transportation means, station / bus stop name, route name, and boundary flag are set in the route record table 261 It has the function to do.

  The required time calculation program 232 functions as a required time calculation means for passing through the first required time from entering the communicable section until reaching the incommunicable section and the incommunicable section. 2 has a function of calculating the second required time required based on the contents of the tables 261 to 265. In addition, when the delay information about the relevant route or road is recorded in the tables 266 and 267, the first and second required times are calculated in consideration of the delay information.

  The video distribution program 233 functions as a distribution unit. The first and second required times calculated by the required time calculation program 232, the buffer size of the reception buffer 180 sent from the mobile terminal 100, and the route Based on the NW band information recorded in the table 261, the function of determining the reproduction bit rate of video data distributed to the mobile terminal 100 and notifying the mobile terminal 100, and the NW band recorded in the route table 261 The distribution bit rate of the video data is determined based on the NW band information recorded in association with the position information in the latest position notification sent from the mobile terminal 100 in the information, and the determined distribution bit rate It has a function to distribute video data.

  The delay management program 234 functions as delay management means, updates the train delay table 266 in accordance with the delay table registration request and the delay table deletion request sent from the delay information management device 600, and creates a congestion information management device. It has a function of updating the road traffic jam table 267 in accordance with the traffic jam table registration request and the traffic jam table deletion request sent from 700. For example, when a delay table registration request including a route name “xx line” and delay information “15” is sent from the delay information management device 600, the route name “xx line” and the delay information “ 15 ”(see FIG. 9), for example, when a traffic jam table deletion request including a road name“ r111 ”is sent from the traffic jam information management device 700, the road name“ r111 ”is entered. The included record is searched from the road congestion table 267 and deleted (see FIG. 10).

  Next, the operation of the present embodiment will be described in detail with reference to the drawings.

[Operation when recording route information]
In the present embodiment, in order to reproduce the video without interruption even in a communication impossible section such as a tunnel existing on the user's moving route, the route table 261 in the video distribution apparatus 200 is previously associated with the moving route. Since it is necessary to record the information (route information), the operation at the time of recording the route information will be described first with reference to the flowchart of FIG.

  When the user of the portable terminal 100 wants to reproduce the video without interruption even in a non-communicable section existing on a moving route that is frequently used, the user is provided in the operation key unit 171 when leaving the starting point of the moving route. A record button (not shown) is pressed (S100). For example, when registering a travel route from home to work, a record button is pressed when leaving the home.

  As a result, the position information transmission program 131 inputs position information (latitude, longitude) indicating the current position of the terminal 100 from the GPS control unit 190, and displays a route recording request including the input position information and transmission date and time. It transmits to the distribution apparatus 200 (S101, S102). Thereafter, the position information transmission program 131 waits for a predetermined time (S105), and performs the process of S100 again. The position information transmission program 131 repeats the above processing until the user presses a recording stop button (not shown) provided in the operation key unit 171 (until S103 becomes Yes).

  On the other hand, when a route recording request is sent from the mobile terminal 100, the route recording program 231 operating on the CPU 210 of the video distribution device 200 transmits the position information (latitude, longitude) included in the route recording request and transmission. The date and time is recorded in a predetermined area of the main memory 220 in association with the section ID (S200). The section ID related to the kth received route recording request is “k”.

  Next, the path recording program 231 acquires the NW band information at that time, and records the acquired NW band information in a predetermined area of the main memory 220 in association with the latest section ID (the largest section ID) (S201). ). The NE band information can be obtained by using ping as follows, for example. When the route recording program 231 executes the ping command specifying the IP address of the mobile terminal 100, an ICMP (Internet Control Message Protocol) Echo request command is transmitted from the video distribution apparatus 200 to the mobile terminal 100, and the mobile terminal 100 Since the ICMP packet is returned as it is, the NW band information can be obtained by calculating (ICMP packet data size) × 2 ÷ (time required until the ICMP packet is returned).

  Each time the route recording program 231 receives a route recording request from the mobile terminal 100, the route recording program 231 performs the same processing as described above.

  When the user of the mobile terminal 100 arrives at the end point (for example, work place) of the travel route, the user presses a recording stop button (not shown) provided on the operation key unit 171. Thereby, the position information transmission program 131 transmits a recording stop notification to the video distribution apparatus 200 (S103, S104).

  When a recording stop request is sent from the mobile terminal 100, the route recording program 231 operating on the CPU 210 of the video distribution device 200 receives each information on the movement route based on the information recorded in the main memory 220. The moving speed of the user in the section is calculated, and the calculated moving speed is recorded in the main memory 220 (S202, S203). For example, the movement speed in the section with the section ID “k” on the movement route is calculated by using the section ID “k” as the distance between points indicated by the position information recorded in association with the section IDs “k” and “k + 1”. ”And“ k + 1 ”, and is calculated by multiplying by the difference between the transmission dates and times recorded. The calculated moving speed is recorded in the main memory 220 in association with the section ID “k”.

  Next, the route recording program 231 has similar movement speeds in the sections on the movement route (the speed difference is within a predetermined range) based on the information recorded in the main memory 220, and each other. Group into groups of consecutive sections. For each section, information (group ID) indicating the group to which the section belongs is recorded in the main memory 220 in association with the section ID of the section (S204).

  Here, taking the case where the contents of the main memory 220 are as shown in FIG. 12 as an example, the processing in step S204 will be described in detail. First, the group ID “G1” is recorded in association with the section ID “0001”. Next, the speed difference between the moving speeds recorded in association with the section IDs “0001” and “0002” is obtained, and it is determined whether or not the speed difference is equal to or less than a predetermined value. If the speed difference is equal to or smaller than the predetermined value, it is determined that the sections with the section IDs “0001” and “0002” belong to the same group, and the group ID “G1” is recorded in association with the section ID “0002”. On the other hand, if the speed difference exceeds a predetermined value, it is determined that the sections with the section IDs “0001” and “0002” belong to different groups, and the group ID “G2” is recorded in association with the section ID “0002”. To do. Now, for example, if the predetermined value is 5 km / h, it is determined that the sections with the section IDs “0001” and “0002” belong to the same group, and the group ID “G1” is recorded in association with the section ID “0002”. . Thereafter, the same processing as described above is performed with the moving speed recorded in association with the section IDs “0002” and “0003” as processing targets. In this case, since the speed difference exceeds a predetermined value (5 km / h), it is determined that the section IDs “0002” and “0003” belong to different groups, and the group ID “G2” is recorded in association with the section ID “0003”. The By performing the above processing up to the last section ID “0008”, the section on the movement route is divided into the first group composed of sections having the section IDs “0001” and “0002”, and section IDs “0003” to “0003”. The group is divided into a second group including a section “0007” and a third group including a section having a section ID “0008”.

  Thereafter, the route recording program 231 determines, based on the information recorded in the main memory 220, the transmission date / time of the position information of the section and the section adjacent to the section (passing order is 1 for each section on the movement route). The difference between the transmission date and time of the position information of the next or previous section) is obtained. Next, based on the obtained difference, for each section on the movement route, the section and the start point of the section adjacent to the section are regarded as the entrance or the exit of the section where communication is not possible. Determine whether or not For a section including the start point determined to be regarded as an entrance or an exit, a boundary flag = “1” is recorded in association with the section ID of the section, and the start point determined to be not regarded as an entrance or an exit is recorded. For the included section, the boundary flag = “0” is recorded in association with the section ID of the section (S205).

  Here, a determination method for determining whether or not the start points of two adjacent sections can be regarded as an entrance or an exit of a non-communication section will be described. First, the route recording program 231 selects the smallest one from the differences obtained for each section on the movement route. Next, the determination reference value is calculated by multiplying the selected difference by a predetermined constant t. The constant t satisfies 1 <t <2, and about 1.5 seems to be appropriate. Thereafter, for each section on the movement route, the difference obtained for the section is compared with the determination reference value. When the difference is equal to or greater than the determination reference value, it is determined that the section and the start point of the section adjacent to the section can be regarded as the entrance or the exit of the communication impossible section. On the other hand, when the difference is less than the determination reference value, it is determined that neither the entrance nor the exit of the communication impossible section can be regarded. Since this determination method uses the transmission date and time in the path record request that is actually received, it can be used even when the transmission period of the path record request differs for each portable terminal. Unlike the above-described method, it cannot be used when the transmission cycle of the route recording request is different for each mobile terminal, but the transmission cycle of the route recording request is the same in all mobile terminals using the video distribution device 200. In this case, a determination method in which the determination reference value is (route recording request transmission cycle × t) can also be used.

  Thereafter, the route recording program 231 calculates the average value of the moving speed in the section belonging to the first group (the group whose group ID is “G1”), and compares the calculated average value with the threshold values α and β. (S206). Note that the threshold values α and β have a relationship of α <β.

  If the average value of the moving speed is less than the threshold value α, it is determined that the user's moving means in each section belonging to the first group is walking, and the moving means is associated with the section ID of each section. The information indicating that is a walk is recorded (S207). Similarly, if the average value of moving speed is α ≦ (average value of moving speed) ≦ β, it is determined that the moving means is a bus, and information indicating that the moving means is a bus is stored in the main memory 220. If it is recorded (S208) and is larger than the threshold value β, it is determined that the moving means is a train, and information indicating that the moving means is a train is recorded in the main memory 220 (S209).

  When the moving means is walking, the route recording program 231 determines whether or not the processing of all the groups is completed (S217), and when the processing is completed, the next group (the second group) The process of step S206 is performed again with the group as a processing target.

  When the moving means is a bus, the route recording program 231 includes, for each section included in the group currently being processed, position information of the start point recorded in the main memory 220 in association with the section ID of the section, Information indicating the existence range of the bus stops recorded in the bus stop table 263 (latitude 1, longitude 1 indicating the upper left position of the rectangle when approximating the existence range of the bus stop with a rectangle, latitude 2, indicating the lower right position, It is determined whether or not there is a bus stop that includes the start point in the existence range. If there is a bus stop that includes the start point of the section in the existence range, the bus stop ID of the bus stop is recorded in association with the section ID of the section already recorded in the main memory 220 (S210). Next, the route recording program 231 inputs the transmission date and time recorded in association with the bus stop ID recorded in step S210 from the main memory 220, and the user passes the input transmission date and time through the bus stop specified by the bus stop ID. The route candidate used by the user is obtained by matching the bus timetable table 265 with the passage time taken into account (S212). For example, if the contents of the bus timetable table 265 are as shown in FIG. 8 and the bus stop time of the bus stop ID “bs-31” input from the main memory 220 is “8:01”, the user A route with the route name “West 53” is obtained as a candidate for the route used.

  When the moving means is a train, the same processing as that when the moving means is a bus is performed, and route candidates used by the user are obtained (S211 and S213).

  When the process of step S212 or step S213 ends, the route recording program 231 checks whether or not there are a plurality of route candidates (S214). If there is only one route candidate, the route name of the route is associated with the section ID of the section included in the group currently being processed and already recorded in the main memory 220. Recording is performed (S216). On the other hand, when there are a plurality of route candidates, a selection screen for causing the portable terminal 100 to select one route from the plurality of route candidates is transmitted (S215).

  The location information transmission program 131 of the portable terminal 100 displays the selection screen sent from the video distribution device 200 on the monitor 151, and transmits the route name of the route selected by the user to the video distribution device 200 (S106).

  As a result, the route recording program 231 associates the route name sent from the portable terminal 100 with the section ID of the section already included in the main processing target and recorded in the main memory 220. Recording is performed (S216). Thereafter, the path recording program 231 checks whether the processing of all groups is completed (S217), and if not completed, returns to step S206 to process the next group. If the processing of all groups is completed, based on the information recorded in the main memory 220, the route table 261 is a record for each section existing on the movement route as shown in FIG. , Records including the items "section ID", "travel time", "latitude", "longitude", "NW band", "transportation means", "station / bus stop", and "route" are recorded in ascending order of section ID (S218). In the main memory 220, “section ID”, “latitude”, “longitude”, “transmission date / time”, “NW band”, “transportation means”, “station / bus stop”, and “route” relating to the section are present in each section. Since it is recorded, a record for each section is generated based on the information for each section and recorded in the route table 261. In the items “section ID”, “latitude”, “longitude”, “NW band”, “transportation means”, “station / bus stop”, and “route” of the record, the values of the corresponding items recorded in the main memory 220 are set as they are, In the item “movement time” of the record, a difference between the transmission date and time of the section corresponding to the record and the transmission date and time of the section immediately before the section corresponding to the record is set.

  Thus, the process of recording the route information in the route table 261 is completed. Thereafter, when the user of the portable terminal 100 moves on the route on which the route information is recorded, the user can play the video without interruption even in a non-communication zone such as a tunnel existing on the route.

[Operation during video distribution]
Next, with reference to the flowcharts of FIGS. 13 to 15, an operation in the case of distributing video data to the mobile terminal 100 in which the route information is recorded in the route table 261 as described above will be described.

  When the user of the mobile terminal 100 plays the video data distributed from the video distribution device 200 while moving the route information in which the route information has been recorded (sometimes referred to as a recorded route), first, the operation key unit 171 is used. Is pressed (S150 in FIG. 13).

  As a result, the video reproduction program 132 operating on the CPU 110 of the mobile terminal 100 receives two pieces of position information from the GPS control unit 190 with a short time interval and receives them from a predetermined storage area. The buffer size f of the buffer 180 is input (S151). Thereafter, the video reproduction program 132 transmits a data distribution request including the two positions input in step S151 and the buffer size f to the video reproduction device 200 (S152). Note that information indicating whether the input order is first or second is added to the two pieces of position information.

When the required time calculation program 232 operating on the CPU 210 of the video distribution device 200 receives a data distribution request from the portable terminal 100, the position included in the record recorded in the route table 261 is included. Select the record whose information indicates the position closest to the position indicated by the second position information in the data distribution request, and use the information indicating the record as the processing target record information indicating the processing target record in step S253. Is recorded (overwritten) in a predetermined area of the main memory 220 (step S251).
(S251).

  Next, the required time calculation program 232 obtains the moving direction of the user of the portable terminal 100 based on the two pieces of position information included in the data distribution request, and from the position indicated by the record selected in step S251, The first and second directions toward the position indicated by the record one before and one behind the record are obtained, and the moving direction of the user is closer to either of the first and second directions described above. (Step S291).

  If the first direction is closer to the user's moving direction than the second direction, the forward flag is set to false, and conversely, the second direction is more user-friendly than the first direction. If the movement direction is close to true, the forward flag is set to true (S292, S293). That is, if the movement direction of the user is the same as when the route information is recorded in the route table 261, the forward flag is set to true, and if it is the opposite direction, the forward flag is set to false. Then, when records are read from the route table 261 in the subsequent processing, if the forward flag is true, the records are read in the same order as the recording order (the section ID is younger), and the forward flag is false. If there are, the records are read in the reverse order of the recording order (in descending order of the section ID).

  Next, the required time calculation program 232 sets the count value i to 1, sets the constant n to a record whose reading order is later than the record found in step S251, and sets the boundary flag value to “1”. A value that is half of the number of records that are present (that is, the number of incommunicable sections in which radio waves existing on the user's moving route do not reach) is set. Further, the required time calculation program 232 sets 0 to each element of each array a, b, w (the number of elements is n) (S252). The first element of the array a has a required time from the start of the user until it reaches the first communication impossible section, and the second element has the first communication impossible section. The time required to reach the second incommunicable section after exiting the nth element is the nth element in the nth element after exiting the (n-1) th incommunicable section The time required to reach the impossible section is set. The time required to pass through the first to nth incommunicable sections is set in the first to nth elements of the array b, respectively. The first element of the array w contains the total amount of data that can be distributed from when the user departs until it reaches the first incommunicable section, and the second element contains the first data The total amount of data that can be distributed during the period from the exit of the incommunicable section to the arrival of the second incommunicable section includes the (n−1) th communication in the nth element. The total amount of data that can be transmitted after the exit from the impossible section until the nth communication impossible section is reached is set.

  Thereafter, the required time calculation program 232 reads the record specified by the processing target record information recorded in the main memory 220 from the route table 261 and checks the moving means set in the record (S253). Now, for example, if the contents of the route table 261 are as shown in FIG. 4 and the processing target record is the first record, the required time calculation program 232 recognizes that the moving means is “walking”. To do.

  Then, when recognizing that the moving means is “walking”, the required time calculation program 232 reads a record in which the moving means different from the record read in step S253 is read, or the boundary flag becomes “1”. The route table 261 is read until the current record is read or the last record is read (S255). In step S255, a process of recording the boundary flag value of the record read last from the path table 261 as flag value information in a predetermined area of the main memory 220, and a record next to the last read record are shown. The information is also recorded in a predetermined area of the main memory 220 as processing target record information indicating the processing target record in step S253. Now, for example, assuming that the forward flag is true, the travel time has changed from “walking” to “train” in the third record, so the required time calculation program 232 is the third record. And record the boundary flag value “0” of that record as flag value information in a predetermined area of the main memory 220 and record information indicating the fourth record in the main memory 220 as processing target record information. To do.

  Next, the required time calculation program 232 adds the movement time “0, 60, 60” set to the read first to third records to thereby obtain position information in the first record. Is calculated from the point indicated by the position information indicated by the position information in the third record, and the calculated required time “120” is added to the first element a [1] of the array a ( S263). In this example, since the value of the element a [1] before addition is “0”, the value of the element a [1] after addition is “120”.

  Thereafter, the required time calculation program 232 determines whether or not the boundary flag of the record read last from the route table 261 is “1” based on the flag value information recorded in a predetermined area of the main memory 220. (S264 in FIG. 14). In this example, since the boundary flag is “0” in the third record read last, the determination result in step S264 is No, and the process in step S270 is performed.

  In step S270, it is determined whether the count value i is larger than a constant n (S270). In this example, since i = 1 and n = 1, the determination result in step S270 is No, and the process in step S253 in FIG. 13 is performed again.

  In step S253, the fourth record is read according to the processing target record information recorded in the main memory 220, and it is recognized that the moving means recorded in the record is “train”. Since the moving means is “train”, the required time calculation program 232 proceeds to step S254. In step S254, the record in which the moving means different from the fourth record is recorded is read, the record whose boundary flag is “1” is read, or the route table 261 is read until the last record. move on. Further, the value of the boundary flag of the record read last from the path table 261 is recorded in the predetermined area of the main memory 220 as flag value information, and information indicating the record next to the record read last is recorded as the processing target record Information is recorded in the main memory 220. In this example, since the boundary flag of the fifth record is “1”, the required time calculation program 232 reads the route table 261 up to the fifth record, and the value of the boundary flag is “1”. Is recorded in the main memory 220, and information indicating the sixth record is recorded in the main memory 220 as processing target record information.

  Thereafter, the required time calculation program 232 is the position in the record immediately before the record read in step S253 (the first record in which the moving means is a train, in this example, the third record). The required time from the point indicated by the information to the point indicated by the position information in the record read last in step S254 (in this case, the fifth record) (entrance of the communication impossible section) was obtained and obtained. The required time is added to the first element a [1] of the array a. At that time, for the section in which the required time can be calculated using the train timetable table 264, the required time is calculated using the train timetable table 264 (S256).

  Here, the operation of step S256 will be described. In step S256, the required time calculation program 232 first determines whether or not there are a plurality of records including the station ID among the records read up to the present time after setting the count value i to the current value “1”. By determining, it is determined whether there is a section in which the required time can be calculated using the train timetable table 264.

  If it is determined that there is no section in which the required time can be calculated using the train timetable table 264 (when there is no record including the station ID or there is only one record), steps S253 and S254 are performed. By adding the travel time in the read record, the time required for the user to reach the entrance of the incommunicable section after getting on the train is calculated, and the calculation result is calculated as the first element a [ Add to 1].

  On the other hand, when it is determined that there is a section in which the required time can be calculated using the train timetable table 264 (when there are a plurality of records including the station ID), the count value i is set to “1”. Among the station IDs included in the records read from to the present time, the station ID having the earliest reading order and the station ID having the latest reading order, and the route recorded in the route table 261 in association with them. By matching the name with the train timetable table 264, the position in the record including the station ID having the latest reading order from the position indicated by the position information in the record including the station ID having the earliest reading order. The required time to the point indicated by the information is calculated, and the calculated required time is added to the first element a [1] of the array a.

  Next, the required time calculation program 232 sets the station ID to the record with the earliest reading order among the records that have been read from the time when the count value i is set to “1” to the present time and the moving means is “train”. It is determined whether or not is set. And only when the station ID is not set, the station ID is set from the point indicated by the position information in the record with the earliest reading order among the records in which the moving means is “train”. Of the records, the required time to the point indicated by the position information in the record in the earliest reading order is calculated by adding the moving time in the record, and the calculated required time is the first in array a. Set to element a [1].

  After that, the required time calculation program 232 sets the station with the slowest reading order among the records read from the count value i set to “1” until the present time and the moving means is “train”. It is checked whether an ID is set. And only when the station ID is not set, the moving means becomes “train” from the point indicated by the position information in the record with the slowest reading order among the records set with the station ID. The required time to the position indicated by the position information in the record with the slowest reading order is calculated by adding the moving time in the record, and the first element a [1 of array a ]. Thereafter, the required time calculation program 232 proceeds to the process of step S261.

  In the case of this example, the station ID is set to the third and fifth records among the first to fifth records read from the count value i set to “1” to the present time. Therefore, the required time from the point indicated by the position information in the third record to the point indicated by the position information in the fifth record is calculated using the train timetable table 264. Is done. For example, if the contents of the train timetable table 264 are as shown in FIG. 7, the required time calculation program 232 searches the train timetable table 264 for a record including the route name “xx line” and records it in the record. Arrival time “10:00” recorded in association with the station ID “st-001” and arrival time “10:05” recorded in association with “st-002” And the calculated difference is defined as the required time from the point indicated by the position information in the third record to the point indicated by the fifth record. Note that a difference in departure time may be obtained instead of the arrival time and used as the required time. If the moving means is “bus”, the same processing as described above is performed using the bus timetable table 265 instead of the train timetable table 264.

  The above is the details of the processing performed in step S256. In the present embodiment, when the moving means is a train or a bus, the required time can be calculated using the tables 264 and 265 for a section in which the required time can be calculated using the timetable tables 264 and 265. However, as in the case where the moving means is walking, the required time may be calculated by adding the moving time in the record read in step S254.

  When the processing of step S256 is completed, the required time calculation program 232 determines whether or not delay information about the route is recorded in the rail delay table 266 when the currently processed route is a railroad route. If it is a bus route, it is determined whether or not delay information for the route is recorded in the road congestion table 267 (S261).

  If no delay information is recorded, the process proceeds to step S264 in FIG. On the other hand, if delay information is recorded, the value of the element a [1] is positively corrected according to the delay information, and then the process proceeds to step S264 in FIG. In the case of this example, since the route to be processed is a railroad route with the route name “xx line”, assuming that the contents of the train delay table 266 are as shown in FIG. Inputs the delay information “15 (%)” recorded in association with the route name “xx line” from the train delay table 266, and sets the value of the element a [1] to 15 (%) according to the input delay information. increase.

  In step S264 in FIG. 14, it is checked based on the flag value information recorded in the main memory 220 whether or not a record whose boundary flag value is “1” has been read. That is, it is checked whether or not a record in which position information relating to the entrance of the communication impossible section is recorded is read. Note that a point indicated by position information in a record whose boundary flag value is “1” may be referred to as a boundary point. In the case of this example, the value of the boundary flag of the fifth record read last is “1”, and flag value information indicating this is recorded in the main memory 220 in step S254. The determination result is Yes.

  After that, the required time calculation program 232 reads the next record (sixth record) in which various information related to the exit of the communication impossible section is recorded from the route table 261, and the travel time set in the record Is set to the first element b [1] of the array b (S265). That is, the required time required to pass through the first incommunicable section existing on the user's movement route is set in element b [1] (step S265).

  Next, when the communication impossible section currently being processed is the first communication impossible section, the required time calculation program 232 determines the first time after the user presses the viewing start button in step S150. The total amount of data that can be transmitted before reaching the entrance of the first communication impossible section is calculated, and the calculated total data amount is set in the first element w [1] of the array w. In addition, when the incommunicable section that is the current processing target is the kth (k ≧ 2) incommunicable section, the (k−1) th incommunicable section is output (the first The total amount of data that can be transmitted from the time of entering the kth communicable section until reaching the entrance of the kth incommunicable section is calculated, and the calculated total data amount is calculated for the kth array in the array w. Set to the th element. In this example, the first communication impossible section is the processing target, and the pressing position of the viewing start button can be regarded as the position indicated by the first record, so the section IDs are “0001” to “ For each section of “0004”, multiply the NW band information in that section and the travel time of that section to calculate the amount of data that can be transmitted in that section, and then add the amount of data that can be transmitted in each section Thus, the total amount of data that can be transmitted until the user reaches the entrance of the communication impossible section is calculated, and the calculated total data amount is set in the first element w [1] of the array w (S266). ).

  Thereafter, when the travel means in the incommunicable section is a train or a bus, the required time calculation program 232 determines whether the route corresponding to the train delay table 266 or the road congestion table 267 is the same as the process in step S261 described above. It is checked whether delay information is recorded (S267). If the delay information for the corresponding route is recorded, the value of the first element b [1] of the array b is positively corrected according to the delay information, similarly to step S262 described above (S268). Thereafter, the count value i is incremented (S269). On the other hand, if the moving means in the incommunicable section is walking and if the delay information of the route corresponding to the tables 266 and 267 is not recorded, the process immediately proceeds to step S269 and the count is performed. Increment the value i.

  After incrementing the count value i, the required time calculation program 232 determines whether or not the count value i satisfies the relationship i> n (S270). When this relationship is satisfied (that is, when the calculation of elements b [i] and w [i] is completed for all incommunicable sections on the user's movement route), the next step S271 is performed. If not, the process returns to step S253. In this example, since n = 1 and i = 2, the required time calculation program 232 proceeds to the process of step S271.

  In step S271, the required time calculation program 232 sets the count values i and j to “1”.

  Thereafter, the video distribution program 232 operates to check whether or not the following equation (1) is satisfied (S272). That is, it is determined whether or not the reception buffer 180 of the mobile terminal 100 overflows when video data is distributed at γw [i] / (a [i] + b [i]) (kbps).

  f ≧ γb [i] w [i] / (a [i] + b [i]) (1)

  In equation (1), f is the buffer size of the reception buffer 180 of the portable terminal 100, γ is the safety factor for the NW band, and w [i] is the (i−1) th communication impossible section from the user. Or the total data amount a [i] that can be transmitted from when the user presses the viewing start button until reaching the entrance of the i-th incommunicable section is ) The time required to reach the entrance of the i-th incommunicable section after the user exits the incommunicable section or after the user presses the viewing start button, b [i] It represents the time required to pass through the i-th communication impossible section. Note that the safety factor γ is a value set in advance within a range of 0 <γ <1, and when the fluctuation of the NW band is predicted to be small, a value close to 1 is large and the fluctuation of the NW band is large. If it is predicted, set a small value.

  When the expression (1) is satisfied, that is, when the reception buffer 180 does not overflow (Yes in S272), the reproduction bit rate is determined as w [i] / (a [i] + b [i]). (S273). On the other hand, when the expression (1) is not satisfied, that is, when the capacity of the reception buffer 180 is insufficient (S272 is No), the reproduction bit rate is determined as f / b [i] (S274). Thereafter, the video distribution program 233 notifies the portable terminal 100 of the determined reproduction bit rate (S275). In the portable terminal 100, the video playback program 132 receives the playback bit rate sent from the video distribution device 200 (S153).

  Thereafter, the video distribution program 233 determines the distribution bit of the video data based on the NW band x [j] in the j-th record of the route table 261, the safety factor γ, and the reproduction bit rate determined in step S276. The rate is determined (S276 in FIG. 15). That is, when the reproduction bit rate determined in step S276 is w [i] / (a [i] + b [i]), the distribution bit rate is set to γx [j] (kbps). When the reproduction bit rate determined in step S276 is f / b [i], the reproduction bit rate f / b [i] and the reproduction bit rate w [i] / (a [ A value obtained by multiplying a ratio of i] + b [i]) is defined as a distribution bit rate. That is, the distribution bit rate is represented by the following equation (2).

  Further, in step S276, the current NW band information is acquired using ping or the like, and the j-th NW band information in the route table 261 is corrected based on the acquired NW band information. Specifically, in the example of FIG. 4, only the NW band information is recorded in the item “NW band”, but the correction count H is also recorded here, and first, by the same method as in step S201 described above. Current NW band information is measured. Next, the NW band information recorded in the item “NW band” of the j-th record is multiplied by the correction count H, and the NW band information measured this time is added to the multiplication result. Thereafter, an average value of the NW band information measured so far is obtained by dividing the addition result by (H + 1). Finally, the NW band information recorded in the (j + 1) th record is replaced with the average value obtained this time, and the correction count H is incremented.

  Distribution bit rate = γx [j] × (f / b [i]) ÷ {w [i] / (a [i] + b [i])} (2)

  After that, the video distribution program 233 reads the video data from the video file storage unit 250 and keeps the mobile terminal at the distribution bit rate determined in step S277 until the user reaches the start point of the next section (until S278 becomes Yes). 100 (S277). At that time, if there is a difference between the standard reproduction bit rate of the video data recorded in the video file storage unit 250 and the reproduction bit rate determined in step S273 or step S274, the video distribution program 233 When the video data is read from the video file storage unit 250, the frames are thinned out or read out in duplicate. For example, when the standard reproduction bit rate is twice the reproduction bit rate determined in step S273 or step S274, the video data is first frame, third frame, fifth frame, and so on. Read every other frame. For example, when the standard reproduction bit rate is ½ of the reproduction bit rate determined in step S273 or step S274, the first frame, the first frame, the second frame, the second frame,. Thus, the same frame is read out in duplicate. Whether or not the user has reached the start point of the next section is determined by sending a location notification including the current location information of the mobile terminal device 100 from the mobile terminal 100 to the video distribution device 200 every predetermined time or video. Each time a predetermined amount of data is received, the position information transmitted from the portable terminal 100 by the image distribution program 233 of the image distribution apparatus 200, and the position information recorded in the jth record of the route table 261, If the difference between the two is equal to or less than a predetermined threshold, a method of determining that the start point of the j-th section has been reached can be employed.

  On the other hand, in the portable terminal 100, when video data is sent from the video distribution device 200, it is stored in the reception buffer 180 (S154). In parallel with this, the video data is read from the reception buffer 180 and reproduced at the reproduction bit rate notified from the video distribution apparatus 200 (S156).

  When the user reaches the start point of the next section (S278 is Yes), the video distribution program 233 determines whether or not the start point of the next section reached by the user is the entrance of the i-th communication impossible section. (S280). This determination is made based on, for example, whether or not the boundary flag recorded in the (j + 1) th record of the route table 261 is “1”. That is, when the boundary flag is “1”, it is determined that it is the entrance of the communication impossible section.

  When it is determined that it is not the entrance of the communication impossible section (S280 is No), after incrementing the count value j (S284), the process of step S276 is performed again to determine the distribution bit rate in the next section. On the other hand, when it is determined that it is the entrance of the i-th communication impossible section (Yes in S280), it waits for the user to reach the exit of the i-th communication impossible section (S281). Whether or not the user has reached the exit of the i-th incommunicable section is determined, for example, by positional information and a route sent from the mobile terminal 100 every predetermined time or every time a predetermined amount of video data is received. The position information recorded in the (j + 1) th record of the table 261 is compared, and determination can be made based on whether or not the difference between the two has become a predetermined value or less.

  When the user reaches the exit of the i-th communication impossible section, the video distribution program 233 determines whether the count value i is larger than a constant n (S282). That is, it is determined whether or not there is an uncommitted communication section that has not been passed on the recorded route.

  If there is a non-passable communicable section (No in S282), the count value i is incremented (S285), and the process returns to step S272 in FIG. On the other hand, when there is no non-passable communicable section, the video data is transmitted to the mobile terminal 100 by a normal distribution method.

[Effect of the first embodiment]
According to the present embodiment, even if the mobile terminal 100 has an economical configuration and does not have a route information calculation function for calculating route information to a destination, video distribution is performed in an incommunicable section such as in a tunnel. The video distributed from the device 200 can be reproduced without interruption. The reason is that the mobile terminal 100 transmits a route recording request including the location information of the mobile terminal 100 to the video distribution device 200 at regular intervals, and the video distribution device 200 is sent from the mobile terminal 100. A route table 261 in which the network bandwidth information, travel time, and boundary flag are recorded in association with the location information is created, and when a data distribution request is sent from the mobile terminal 100, the route table 261 is used to distribute to the mobile terminal 100 This is because the reproduction bit rate and distribution bit rate of the video data to be determined are determined.

  Further, according to the present embodiment, even when there are a plurality of sections where communication is impossible on the user's moving route, the video can be reproduced without interruption. The reason is that at the time of reproducing the video data, the mobile terminal 100 transmits a location notification including the location information of the mobile terminal 100 to the video delivery device 200, and the video delivery device 200 transmits the location notification and the contents of the route table 261. This is because the reproduction bit rate and the distribution bit rate of the video data distributed to the mobile terminal 100 are determined based on the above.

  Further, according to the present embodiment, the network bandwidth information recorded in the route table 261 can be made according to the actual network status. The reason is that every time the mobile terminal 100 reaches the position indicated by the position information recorded in the route table 261, the network bandwidth information at that time is obtained and recorded in the route table 261 according to the obtained network bandwidth information. This is because the existing network bandwidth information is corrected.

  Furthermore, according to the present embodiment, even when there is a delay in the transportation means used by the user, the video can be reproduced without interruption in the communication impossible section. The reason is that a delay information table in which delay information indicating the degree of delay is recorded in association with the route name is provided, and by using this table, it is possible to determine the time required to pass through the communication impossible section and the communication possible section. This is because the correction is made.

  Further, according to the present embodiment, the first and second required times that are the same as those during normal operation are recorded in the route table 261 even when a delay occurs in the transportation facility when the route information is recorded. Can do. The reason is that it includes timetable tables 264 and 265 in which departure and arrival times at each station and each bus stop are recorded in association with the route name, and the first and second timetables 264 and 265 are used. This is because the required time is calculated.

[Second embodiment of the present invention]
Next, a second embodiment of the present invention will be described.

  Referring to FIG. 16, the second embodiment of the data distribution system according to the present invention includes a mobile terminal 1 and a data distribution device 2.

  The portable terminal 1 includes a position detection unit 11, a position information transmission unit 12, a reproduction unit 13, and a reception buffer 14.

  The position detection unit 11 has a function of detecting the current position of the terminal 1 itself.

  The position information transmission unit 12 records the user's movement route in the data distribution apparatus 2 every time the route recording request is transmitted (for example, every predetermined time), the current position detected by the position detection unit 11. Has a function of transmitting a route recording request including the position information to the data distribution apparatus 2.

  The reception buffer 14 has a function of temporarily storing data such as video data distributed from the data distribution device 2.

  When the reproduction unit 13 requests the data distribution apparatus 2 to distribute data, the reproduction unit 13 distributes the data distribution request including the position information of the current position detected by the position detection unit 11 and the buffer size of the reception buffer 14. It has a function of transmitting to the apparatus 2 and a function of reading and reproducing data from the reception buffer 14 in accordance with the reproduction bit rate sent from the data distribution apparatus 2 in response to a data distribution request.

  The position information transmitting unit 12 and the reproducing unit 13 can be realized by a CPU. In this case, for example, the following is performed. A recording medium such as a disk or a semiconductor memory on which a program for causing the CPU to function as the position information transmitting unit 12 and the reproducing unit 13 is prepared, and the CPU reads the program. The CPU realizes the position information transmitting unit 12 and the reproducing unit 13 on its own CPU by controlling its own operation according to the read program.

  The data distribution apparatus 2 includes a path table 21 configured on a disk device, a path recording unit 22, a required time calculation unit 23, and a distribution unit 24.

  The route recording unit 22 has a function of recording the position information included in the route recording request for each route recording request sent from the mobile terminal 1 in the route table 21 in a form in which the order of reception is known. Further, the route recording means 22 is associated with each piece of position information recorded in the route table 21 from the network bandwidth information when the position information is sent, and the position indicated by the position information. The travel time to the position indicated by the position information sent immediately before or after, the position indicated by the position information, and the position indicated by the position information sent immediately before or after the position information It has a function of recording a boundary flag indicating whether or not the communication interval between which the radio waves do not reach is a communication impossible section.

  The required time calculation means 23 passes through the first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal 1 until the communication impossible section and the communication impossible section. Therefore, the second required time required for this is calculated based on the contents of the route table 21.

  The distribution unit 24 includes the first and second required times calculated by the required time calculation unit 23, the buffer size in the data distribution request sent from the mobile terminal 1, and the network bandwidth recorded in the route table 21. Based on the information and the travel time, it has a function of determining a reproduction bit rate of data to be distributed to the portable terminal 1 and transmitting the decided reproduction bit rate to the portable terminal 1. Furthermore, it has a function of determining a distribution bit rate of data to be distributed to the mobile terminal 1 based on the network bandwidth information recorded in the route table 21, and distributing the data at the determined distribution bit rate.

  The data distribution apparatus 2 can be realized by a computer, and when realized by a computer, for example, is as follows. A disk, a semiconductor memory, and other recording media on which a program for causing the computer to function as the path recording unit 22, the required time calculation unit 23, and the distribution unit 24 are prepared, and the computer reads the program. The computer controls its own operation according to the read program, thereby realizing the route recording means 22, the required time calculation means 23, and the distribution means 24 on the computer.

  Next, the operation of the present embodiment will be described.

  The user of the mobile terminal 1 wants to view the video data distributed from the data distribution device 2 without interruption even in an incommunicable section existing on a route frequently used (for example, a route used for commuting or attending school). In this case, as preparation for this, the mobile terminal 1 in which the position information transmitting means 12 is in the operating state is carried at the starting point of the moving route, and actually moves on the route.

  The position information transmitting unit 12 of the portable terminal 1 transmits a route recording request including the position information of the current position detected by the position detecting unit 11 to the data distribution device 2 every time the route recording request is transmitted. . On the other hand, the route recording means 22 in the data distribution device 2 stores the location information included in the route recording request for each route recording request sent from the mobile terminal 1 in the route table 21 in a form that indicates the order of reception. Record. Further, the route recording means 22 records network bandwidth information, travel time, and boundary flag in association with the position information recorded in the route table 21. Such processing is repeated until the user arrives at the end point of the movement route and the user stops the position information transmission unit 12.

  Thus, preparations for viewing video data and the like without interruption are completed even in a communication impossible section.

  Thereafter, when the user wants to view video data or the like distributed from the data distribution apparatus 2 while moving along the route, the user activates the reproduction means 13. As a result, the reproduction unit 13 transmits a data distribution request including the position information indicating the current position detected by the position detection unit 11 and the buffer size of the communication buffer 14 to the data distribution apparatus 2.

  The required time calculation means 23 in the data distribution apparatus 2 includes a first required time until the communication impossible section is reached from the position indicated by the position information in the data distribution request sent from the mobile terminal 1, and the communication The second required time necessary for passing through the impossible section is calculated based on the contents of the route table 21.

  Thereafter, the distribution unit 24 includes the first and second required times calculated by the required time calculation unit 23, the buffer size of the reception buffer 14 sent from the mobile terminal 1, and the network recorded in the route table 21. Based on the band information and the travel time, the reproduction bit rate of data distributed to the mobile terminal 1 is determined, and the determined reproduction bit rate is transmitted to the mobile terminal 1. Furthermore, the distribution unit 24 determines a distribution bit rate of data to be distributed to the mobile terminal 1 based on the network bandwidth information recorded in the route table 21, and distributes the data to the mobile terminal 1 at the bit rate.

  The data transmitted from the data distribution device 2 to the portable terminal 1 is stored in the reception buffer 14 in the portable terminal 1, and the reproduction means 13 is instructed by the data distribution device 2 to store the data stored in the reception buffer 14. Read and play at the playback bit rate.

[Effect of the second embodiment]
According to the present embodiment, even if the mobile terminal 1 has an economical configuration and does not have a route information calculation function for calculating route information to the destination, data distribution is performed in an incommunicable section such as in a tunnel. Data distributed from the device 2 can be reproduced without interruption. The reason is that the mobile terminal 1 transmits a route recording request including the location information of the mobile terminal 1 to the data distribution device 2 at regular intervals, and the data distribution device 2 is sent from the mobile terminal 1. A route table 21 in which the network bandwidth information, travel time, and boundary flag are recorded in association with the location information is created, and when a data distribution request is sent from the portable terminal 1, the route table 21 is used to distribute This is because the reproduction bit rate and distribution bit rate of the data to be determined are determined.

  The present invention is preferably applied to a data distribution system that wirelessly distributes video data, audio data, and the like to mobile terminals.

DESCRIPTION OF SYMBOLS 1 ... Portable terminal 11 ... Position detection means 12 ... Position information transmission means 13 ... Reproduction means 14 ... Reception buffer 2 ... Data distribution apparatus,
21 ... route table 22 ... route recording means 23 ... required time calculating means 24 ... distribution means 100 ... portable terminal 110 ... CPU
120 ... main memory 130 ... program memory 131 ... position information transmission program 132 ... video reproduction program 140 ... audio output unit 141 ... speaker 150 ... display unit 151 ... monitor 160: Wireless communication unit 161 ... Antenna 170 ... Key input unit 171 ... Operation key unit 180 ... Reception buffer 190 ... GPS control unit 191 ... GPS antenna 200 ... Video Distribution device 210... CPU
220 ... Main memory 230 ... Program memory 231 ... Path recording program 232 ... Required time calculation program 233 ... Video distribution program 234 ... Delay management program 240 ... Communication unit 250 ... Video file storage unit 260 ... database 261 ... route table 262 ... station table 263 ... bus stop table 264 ... train timetable table 265 ... bus timetable table 266 ... train delay Table 267 ... Road traffic jam table 300 ... Radio base station 400 ... Communication channel 500 ... GPS satellite 600 ... Delay information management device 700 ... Traffic jam information management device

Claims (14)

A portable terminal device and a data distribution device;
The portable terminal device
Position detecting means for detecting the current position of the own device;
Location information for transmitting a route recording request including location information of the current location detected by the location detection means to the data distribution device every time a route recording request is transmitted when recording a user's movement route A transmission means;
A reception buffer for temporarily storing data distributed from the data distribution device;
At the time of a data distribution request, a data distribution request including the position information of the current position detected by the position detection unit and the buffer size of the reception buffer is transmitted to the data distribution apparatus, and the data distribution request is responded And reproducing means for reading and reproducing data from the reception buffer according to the reproduction bit rate sent from the data distribution device,
The data distribution device includes:
A route table;
For each route record request sent from the mobile terminal device, the position information included in the route record request is recorded in the route table, and the position information is associated with each position information recorded in the route table. The network bandwidth information when the information is sent, the movement time from the position indicated by the position information to the position indicated by the position information sent immediately before or after the position information, and the position A boundary flag indicating whether or not a communication impossible section where radio waves do not reach is recorded between the position indicated by the information and the position indicated by the position information sent immediately before or after the position information. Route recording means;
A first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal device to reach the incommunicable section, and the first time required for passing through the incommunicable section Required time calculating means for calculating the required time of 2 based on the contents of the route table;
First and second required times calculated by the required time calculating means, a buffer size in a data distribution request sent from the portable terminal device, network bandwidth information and travel time recorded in the route table And determining the reproduction bit rate of the data to be distributed to the mobile terminal device, transmitting the determined reproduction bit rate to the mobile terminal device, and based on the network bandwidth information recorded in the route table A data distribution system comprising: distribution means for determining a distribution bit rate of data to be distributed to the portable terminal device and distributing data to the portable terminal device at the determined distribution bit rate. The data distribution system according to claim 1, wherein
The reproduction means transmits a position notification including the position information of the current position detected by the position detection means to the data distribution device every time the position notification is transmitted at the time of reproduction of data,
The required time calculation means is configured such that when a data distribution request is sent from the mobile terminal device, based on the contents of the route table, adjacent communicable sections and non-communicable sections existing on the user's moving path For each set, the first required time required to pass through the communicable section and the second required time required to pass through the incommunicable section are calculated,
When the distribution means detects that the user has entered the communicable section based on a data distribution request or a position notification sent from the mobile terminal device, the first and second calculated by the required time calculation means The first and second required times for the communicable section in which the user entered and the incommunicable section paired with the communicable section, and the mobile terminal device Of the buffer size in the data distribution request and the network bandwidth information and travel time recorded in the route table, the communicable section where the user has entered and the communication impossible paired with the communicable section Based on the network bandwidth information and travel time for the section, the playback bit rate of data to be distributed to the mobile terminal device is determined, and the mobile Distribution bit rate of data transmitted to the terminal device and distributed to the portable terminal device based on the network bandwidth information about the communicable section entered by the user in the network bandwidth information recorded in the route table And distributing data to the portable terminal device at the determined distribution bit rate. The data distribution system according to claim 1 or 2,
The distribution means obtains network bandwidth information at that time each time the mobile terminal device reaches the position indicated by the location information recorded in the route table, and associates the location information with the location information according to the obtained network bandwidth information. A data distribution system for correcting recorded network bandwidth information. The data distribution system according to claim 1, 2, or 3,
The data distribution apparatus includes a delay information table in which delay information indicating a degree of delay time is recorded in association with a route name, and
The route recording means records the user's moving means at the position indicated by the position information in association with each piece of position information recorded in the route table. If the moving means is a transportation facility, the route recording means further includes the user. Record the route name of the route used by
The required time calculating means is recorded in the delay information table in association with position information indicating a position on the communicable section for calculating the first required time or on the incommunicable section for calculating the second required time. When the same route name is recorded, the first or second required time is corrected according to the delay information recorded in association with the route name. Distribution system. The data distribution system according to claim 4, wherein
The data distribution device includes a timetable table in which departure and arrival times are recorded at each station or each stop existing on the route in association with the route name, and
The route recording means associates with the location information in which the location indicated by the location information of the location information recorded in the route table matches the location of the station or stop, and identifies the station name or stop Record your name,
When the required time calculation means includes a plurality of position information recorded in association with a station name or a stop name in the position information indicating the position on the communicable section for calculating the first required time, Of the stations or stops recorded in association with the station name or the stop name, the required time between the station or stop with the earliest user passage and the station or stop with the latest user passage is the time A data distribution system characterized by calculating with reference to a table. Position detection means for detecting the current position of the device itself, and path recording including position information of the current position detected by the position detection means each time when a route recording request is transmitted at the time of recording a user's movement route Position information transmitting means for transmitting a request to the data distribution apparatus, a reception buffer for temporarily storing data distributed from the data distribution apparatus, and detected by the position detection means at the time of data distribution request A data distribution request including the position information of the current position and the buffer size of the reception buffer is transmitted to the data distribution apparatus, and according to the reproduction bit rate sent from the data distribution apparatus in response to the data distribution request a portable terminal apparatus having a reproduction means for reading and reproducing data from the reception buffer, and data distributed from the data distribution apparatus A data delivery device which is a component of the stem,
A route table;
For each route record request sent from the mobile terminal device, the position information included in the route record request is recorded in the route table, and the position information is associated with each position information recorded in the route table. The network bandwidth information when the information is sent, the movement time from the position indicated by the position information to the position indicated by the position information sent immediately before or after the position information, and the position A boundary flag indicating whether or not a communication impossible section where radio waves do not reach is recorded between the position indicated by the information and the position indicated by the position information sent immediately before or after the position information. Route recording means;
A first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal device to reach the incommunicable section, and the first time required for passing through the incommunicable section Required time calculating means for calculating the required time of 2 based on the contents of the route table;
First and second required times calculated by the required time calculating means, a buffer size in a data distribution request sent from the portable terminal device, network bandwidth information and travel time recorded in the route table And determining the reproduction bit rate of the data to be distributed to the mobile terminal device, transmitting the determined reproduction bit rate to the mobile terminal device, and based on the network bandwidth information recorded in the route table A data distribution apparatus comprising: distribution means for determining a distribution bit rate of data to be distributed to the portable terminal device and distributing data to the portable terminal device at the determined distribution bit rate. The data distribution apparatus according to claim 6, wherein
The reproduction means transmits a position notification including the position information of the current position detected by the position detection means to the data distribution device every time the position notification is transmitted at the time of reproduction of data,
The required time calculation means is configured such that when a data distribution request is sent from the mobile terminal device, based on the contents of the route table, adjacent communicable sections and non-communicable sections existing on the user's moving path For each set, the first required time required to pass through the communicable section and the second required time required to pass through the incommunicable section are calculated,
When the distribution means detects that the user has entered the communicable section based on a data distribution request or a position notification sent from the mobile terminal device, the first and second calculated by the required time calculation means The first and second required times for the communicable section in which the user entered and the incommunicable section paired with the communicable section, and the mobile terminal device Of the buffer size in the data distribution request and the network bandwidth information and travel time recorded in the route table, the communicable section where the user has entered and the communication impossible paired with the communicable section Based on the network bandwidth information and travel time for the section, the playback bit rate of data to be distributed to the mobile terminal device is determined, and the mobile Distribution bit rate of data transmitted to the terminal device and distributed to the portable terminal device based on the network bandwidth information about the communicable section entered by the user in the network bandwidth information recorded in the route table And distributing data to the portable terminal device at the determined distribution bit rate. The data distribution device according to claim 6 or 7,
The distribution means obtains network bandwidth information at that time each time the mobile terminal device reaches the position indicated by the location information recorded in the route table, and associates the location information with the location information according to the obtained network bandwidth information. A data distribution apparatus for correcting recorded network bandwidth information. The data distribution device according to claim 6, 7 or 8,
A delay information table in which delay information indicating the degree of delay time is recorded in association with the route name; and
The route recording means records the user's moving means at the position indicated by the position information in association with each piece of position information recorded in the route table. If the moving means is a transportation facility, the route recording means further includes the user. Record the route name of the route used by
The required time calculating means is recorded in the delay information table in association with position information indicating a position on the communicable section for calculating the first required time or on the incommunicable section for calculating the second required time. When the same route name is recorded, the first or second required time is corrected according to the delay information recorded in association with the route name. Distribution device. The data distribution apparatus according to claim 9, wherein
A timetable table in which the arrival and departure times at each station or each stop existing on the route in association with the route name are recorded, and
The route recording means associates with the location information in which the location indicated by the location information of the location information recorded in the route table matches the location of the station or stop, and identifies the station name or stop Record your name,
When the required time calculation means includes a plurality of position information recorded in association with a station name or a stop name in the position information indicating the position on the communicable section for calculating the first required time, Of the stations or stops recorded in association with the station name or the stop name, the required time between the station or stop with the earliest user passage and the station or stop with the latest user passage is the time A data distribution apparatus for calculating with reference to a table. When the location information transmission means of the mobile terminal device records the movement route of the user, every time it becomes the transmission timing of the route recording request, the route recording request including the location information of the own device is transmitted to the data distribution device,
The route recording means of the data distribution device records the position information included in the route recording request for each route recording request sent from the mobile terminal device in the route table and records it in the route table. In association with each position information, the network bandwidth information when the position information is sent and the position information sent one before or after the position information from the position indicated by the position information indicate Whether the interval between the travel time to the location and the location indicated by the location information and the location indicated by the location information sent one before or after the location information is a non-communication zone where radio waves do not reach Record a boundary flag indicating whether or not
The reproduction means of the portable terminal device includes position information indicating the current position of the device itself when data distribution is requested, and a buffer size of a reception buffer for temporarily storing data distributed from the data distribution device. A data distribution request to the data distribution device,
The required time calculation means of the data distribution device includes a first required time until the communication impossible section is reached from the position indicated by the position information in the data distribution request sent from the portable terminal device, and the communication failure. Calculating a second required time required to pass through the possible section based on the contents of the route table;
The distribution means of the data distribution device records the first and second required times calculated by the required time calculation means, the buffer size in the data distribution request sent from the portable terminal device, and the route table. Based on the network bandwidth information and the travel time, the playback bit rate of data to be distributed to the mobile terminal device is determined, the determined playback bit rate is transmitted to the mobile terminal device, and the routing table Determining a delivery bit rate of data to be delivered to the mobile terminal device based on the recorded network bandwidth information, delivering data to the mobile terminal device at the determined delivery bit rate,
A data distribution method, wherein the reproduction means of the portable terminal device reads and reproduces data from the reception buffer according to a bit rate sent from the data distribution device in response to the data distribution request. The data distribution method according to claim 11, wherein
It said reproducing means, during data reproduction, each of the transmission timing of the position notification, and sends the location notification containing the location information of the current position of position置検detection means detects to said data distribution apparatus,
The required time calculation means is configured such that when a data distribution request is sent from the mobile terminal device, based on the contents of the route table, adjacent communicable sections and non-communicable sections existing on the user's moving path For each set, the first required time required to pass through the communicable section and the second required time required to pass through the incommunicable section are calculated,
When the distribution means detects that the user has entered the communicable section based on a data distribution request or a position notification sent from the mobile terminal device, the first and second calculated by the required time calculation means The first and second required times for the communicable section in which the user entered and the incommunicable section paired with the communicable section, and the mobile terminal device Of the buffer size in the data distribution request and the network bandwidth information and travel time recorded in the route table, the communicable section where the user has entered and the communication impossible paired with the communicable section Based on the network bandwidth information and travel time for the section, the playback bit rate of data to be distributed to the mobile terminal device is determined, and the mobile Network bandwidth information about the communicable section entered by the user and the incommunicable section paired with the communicable section of the network bandwidth information recorded in the route table while being transmitted to the terminal device A data distribution method comprising: determining a distribution bit rate of data to be distributed to the portable terminal device based on the data, and distributing data to the portable terminal device at the determined distribution bit rate. Position detection means for detecting the current position of the device itself, and path recording including position information of the current position detected by the position detection means each time when a route recording request is transmitted at the time of recording a user's movement route Position information transmitting means for transmitting a request to the data distribution apparatus, a reception buffer for temporarily storing data distributed from the data distribution apparatus, and detected by the position detection means at the time of data distribution request A data distribution request including the position information of the current position and the buffer size of the reception buffer is transmitted to the data distribution apparatus, and according to the reproduction bit rate sent from the data distribution apparatus in response to the data distribution request a portable terminal apparatus having a reproduction means for reading and reproducing data from the reception buffer, and data distributed from the data distribution apparatus The data delivery device which is a component of the stem, a program for implementing by a computer having a routing table,
The computer,
For each route record request sent from the mobile terminal device, the position information included in the route record request is recorded in the route table, and the position information is associated with each position information recorded in the route table. The network bandwidth information when the information is sent, the movement time from the position indicated by the position information to the position indicated by the position information sent immediately before or after the position information, and the position A boundary flag indicating whether or not a communication impossible section where radio waves do not reach is recorded between the position indicated by the information and the position indicated by the position information sent immediately before or after the position information. Route recording means,
A first required time from the position indicated by the position information in the data distribution request sent from the mobile terminal device to reach the incommunicable section, and the first time required for passing through the incommunicable section Required time calculation means for calculating the required time of 2 based on the contents of the route table;
First and second required times calculated by the required time calculating means, a buffer size in a data distribution request sent from the portable terminal device, network bandwidth information and travel time recorded in the route table And determining the reproduction bit rate of the data to be distributed to the mobile terminal device, transmitting the determined reproduction bit rate to the mobile terminal device, and based on the network bandwidth information recorded in the route table A program for determining a distribution bit rate of data to be distributed to the portable terminal device and functioning as distribution means for distributing data to the portable terminal device at the determined distribution bit rate. The program according to claim 13, wherein
The reproduction means transmits a position notification including the position information of the current position detected by the position detection means to the data distribution device every time the position notification is transmitted at the time of reproduction of data,
The required time calculation means is configured such that when a data distribution request is sent from the mobile terminal device, based on the contents of the route table, adjacent communicable sections and non-communicable sections existing on the user's moving path For each set, the first required time required to pass through the communicable section and the second required time required to pass through the incommunicable section are calculated,
When the distribution means detects that the user has entered the communicable section based on a data distribution request or a position notification sent from the mobile terminal device, the first and second calculated by the required time calculation means The first and second required times for the communicable section in which the user entered and the incommunicable section paired with the communicable section, and the mobile terminal device Of the buffer size in the data distribution request and the network bandwidth information and travel time recorded in the route table, the communicable section where the user has entered and the communication impossible paired with the communicable section Based on the network bandwidth information and travel time for the section, the playback bit rate of data to be distributed to the mobile terminal device is determined, and the mobile Distribution bit rate of data transmitted to the terminal device and distributed to the portable terminal device based on the network bandwidth information about the communicable section entered by the user in the network bandwidth information recorded in the route table And distributing data to the portable terminal device at the determined distribution bit rate.

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