JP2008276609A - Broadcasting schedule formation device, geographic information delivery system and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To deliver geographic information by broadcasting in an appropriate broadcasting schedule according to a position of a receiver. <P>SOLUTION: A schedule server 1 includes a communication means for receiving information related to position, movement and broadcast receiving quality for a receiving terminal of broadcasting data via a communication network; an area priority calculation means for calculating an area priority showing an area geographic information of which is to be preferentially broadcasted based on the information received via the communication network; and a broadcasting schedule formation means for scheduling geographic information of each area according to the area priority. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast schedule creation device, a geographic information distribution system, and a computer program.

Conventionally, for example, a content distribution system (prior art 1) described in Patent Document 1 is known. In this content distribution system, the in-vehicle device is based on user-side conditions such as user preferences and vehicle conditions, conditions related to user-side environments such as communication environments, and content-related conditions such as content genres. Appropriate content is selected from the content in the candidate list information, the reproduction order of the content is determined, program guide information is created, and the program guide information is transmitted to the content server. Further, a data broadcasting device (conventional technology 2) described in Patent Document 2 is known. In this data broadcasting apparatus, profile information including preference information of the receiver is received from the terminal of the receiver of the data broadcast via a communication network, and the broadcast schedule is updated based on the received profile information.
Japanese Patent Laid-Open No. 2005-84752 JP 2006-165914 A

  However, the above-described prior art 1 performs information distribution by individual communication according to the distribution schedule of each individual, and is difficult to apply to information distribution by broadcasting to a plurality of recipients. Moreover, in the prior art 2, it is difficult to create an appropriate broadcast schedule according to the position of the receiver.

  The present invention has been made in consideration of such circumstances, and its purpose is to provide a broadcast schedule creation device and geographical information distribution capable of broadcasting and distributing geographic information according to an appropriate broadcasting schedule according to the position of the receiver. It is to provide a system and a computer program.

  In order to solve the above-described problem, a broadcast schedule creation device according to the present invention is a broadcast schedule creation device that creates a schedule for broadcasting geographic information of a plurality of areas. Based on communication means for receiving information relating to broadcast reception quality via a communication network, and area priority indicating which area geographical information is preferentially broadcast based on the information received via the communication network. An area priority calculating means and a broadcast schedule creating means for scheduling geographic information of each area according to the area priority are provided.

  In the broadcast schedule creation device according to the present invention, the area priority is composed of terminal individual area priority calculated for each receiving terminal, and the terminal individual area priority is the broadcast reception quality of the target area. Priority that rises worse than broadcast reception quality in the area where the receiving terminal is located, priority that lowers as broadcast reception quality in the area where the receiving terminal is bad, and the receiving terminal moves toward the target area Any one or a combination of a priority that increases as the distance increases or a priority that increases as the distance between the target area and the area where the receiving terminal is located is combined.

  In the broadcast schedule creation device according to the present invention, the terminal individual area priority is such that the priority increases as the distance between the target area and the area where the receiving terminal is closer increases. It is characterized by being configured to be inversely proportional to.

但し、
ｍは１からｎまでのいずれかの整数（端末個別区域優先度の算出対象である受信端末を表す）、
ｎは受信端末の台数、
Ａｐは対象区域における放送データの平均損失率（百分率）、
Ａｐｍは受信端末（ｍ）が位置する区域における放送データの平均損失率（百分率）、
θ_ｍは対象区域の中心点の座標（ｘ，ｙ）と受信端末（ｍ）の位置の座標（ｌｘ_ｍ，ｌｙ_ｍ）を結ぶ直線に対して受信端末（ｍ）の移動方向が成す角度（−９０°≦θ_ｍ≦９０°）、
ｒ_ｍは受信端末（ｍ）が一定期間に進む距離、
（ｌｘ_ｍ，ｌｙ_ｍ）は受信端末（ｍ）の位置の座標、
（ｘ，ｙ）は対象区域の中心点の座標、
であることを特徴とする。 In the broadcast schedule creation device according to the present invention, the zone priority (M) and the terminal individual zone priority (Em) are calculated by the following equations:

However,
m is any integer from 1 to n (represents a receiving terminal for which the terminal individual area priority is to be calculated),
n is the number of receiving terminals,
Ap is the average loss rate (percentage) of broadcast data in the target area,
Apm is the average loss rate (percentage) of broadcast data in the area where the receiving terminal (m) is located,
θ _m is an angle formed by the moving direction of the receiving terminal (m) with respect to a straight line connecting the coordinates (x, y) of the center point of the target area and the coordinates (lx _m , ly _m ) of the position of the receiving terminal (m) ( −90 ° ≦ θ _m ≦ 90 °),
r _m is the distance of the receiving terminal (m) is advanced over a period of time,
(Lx _m , ly _m ) is the coordinates of the position of the receiving terminal (m),
(X, y) is the coordinates of the center point of the target area,
It is characterized by being.

  In the broadcast schedule creation device according to the present invention, the geographic information is composed of a plurality of types of information and is layered so that one type of information forms one layer, and the one type of information is: The communication means comprises a layer request for the receiving terminal, a lost resource, a resource that has been received, and information related to a resource that has started browsing via a communication network. , Calculating a layer priority indicating which layer of geographic information is preferentially broadcast based on the layer request, and indicating a resource priority indicating which resource is preferentially broadcast based on the information related to the resource Priority is calculated, and the layer resource priority is calculated by combining the layer priority and the resource related priority. Comprising a layer resource priority calculation means for output, the broadcast schedule creating means, according to the zone priority and the layer resource priority, and wherein the scheduling geographic information of each resource.

  In the broadcast schedule creation device according to the present invention, the geographic information is composed of a plurality of types of information and is layered so that one type of information forms one layer, and the one type of information is: The broadcast schedule creation device comprises resource itself priority calculation means for calculating the resource priority including the freshness, update frequency, and importance of the resource, and the broadcast schedule creation means comprises: Geographic information of each resource is scheduled according to the zone priority and the resource itself priority.

  The geographic information delivery system according to the present invention is created by the broadcast schedule creation device described above, broadcast delivery means for broadcasting geographic information according to the broadcast schedule created by the broadcast schedule creation device, and the broadcast schedule creation device. And a communication distribution means for distributing geographical information leaked from the broadcast schedule via a communication network.

A computer program according to the present invention is a computer program for creating a schedule for broadcasting geographic information of a plurality of areas, and which area is based on information on the position, movement and broadcast reception quality of a broadcast data receiving terminal. To allow a computer to realize an area priority calculation function for calculating an area priority indicating whether or not to preferentially broadcast geographical information and a broadcast schedule creation function for scheduling geographical information of each area according to the area priority. It is characterized by.
Thereby, the above-described broadcast schedule creation apparatus can be realized using a computer.

  According to the present invention, it is possible to obtain an effect that geographical information can be broadcast and distributed with an appropriate broadcast schedule corresponding to the position of the receiver.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of a geographic information distribution system according to an embodiment of the present invention. In FIG. 1, the geographic information distribution system includes a schedule server device 1, a content server device 2, a resource download server device 3, a broadcast server device 4, and a client terminal device 5.

  The schedule server device 1, the content server device 2, and the resource download server device 3 can transmit data between them. The content server device 2 can transmit data to and from the broadcast server device 4. Each of the schedule server device 1 and the resource download server device 3 can transmit data to and from the client terminal device 5 via a communication network.

  The schedule server device 1 (hereinafter referred to as “schedule server 1”) creates a schedule for broadcasting geographic information possessed by the content server device 2 (hereinafter referred to as “content server 2”). The content server 2 receives the broadcast schedule from the schedule server 1 and transmits the broadcast schedule and the geographical information to be broadcast to the broadcast server device 4 (hereinafter referred to as the broadcast server 4). The broadcast server 4 transmits the geographic information received from the content server 2 on the broadcast wave according to the broadcast schedule received from the content server 2. This broadcast wave is received by the client terminal device 5 (hereinafter referred to as the client 5).

  The geographic information possessed by the content server 2 is composed of a plurality of types of information such as maps, traffic, buildings, public transportation operation status, weather, disasters, accident statistics, and position-linked advertisements. Geographic information is hierarchized so that one type of information forms one layer. All the layers are divided into common areas. Thereby, the information of one layer of geographic information is composed of information (referred to as resources) for each area. One resource is information of one area in one layer.

  In this embodiment, the areas are divided into meshes (mesh), but how to divide the areas may be arbitrarily defined. The range and the center point of the area are determined by the common coordinate format according to the present embodiment. The coordinates representing the range of each area and the coordinates of the center point of each area are determined in advance. The schedule server 1 holds information on the coordinates representing the range of each area and the coordinates of the center point of each area.

  The content server 2 has a geographic information database that accumulates geographic information. The geographic information database updates the stored contents according to the geographic information that changes from moment to moment. The content server 2 creates a list (resource configuration information) of resources constituting the geographic information in the geographic information database. The content server 2 transmits the resource configuration information to the schedule server 1. The resource configuration information is transmitted to the schedule server 1 when the resource configuration content is changed.

  The resource download server device 3 (hereinafter referred to as the resource download server 3) receives a request for distribution of geographic information that is not included in the broadcast schedule from the schedule server 1, acquires the geographic information from the content server 2, and acquires the acquired geographic information. Is downloaded to the client 5 via the communication network. The distribution request from the schedule server 1 includes resource identification information (resource ID) indicating a resource to be distributed and a communication address indicating the client 5 as a distribution destination.

  The broadcast server 4 receives a broadcast schedule and geographic information to be broadcast from the content server 2. The broadcast server 4 stores geographic information in the transmission memory according to the broadcast schedule. The geographic information is transmitted on the broadcast wave in the order stored in the transmission memory.

  The client 5 has a communication function and a broadcast reception function, and displays geographical information acquired by communication or broadcast on the screen of the display device. Examples of the client 5 include an in-vehicle navigation device in VICS (Vehicle Information Communication System).

  The client 5 has a user profile creation function in addition to the communication function and the broadcast reception function. The user profile includes information regarding the position, movement, and broadcast reception quality of the client 5 and information regarding layer requests, lost resources, resources that have been received, and resources that have started browsing. The position of the client 5 is represented in a common coordinate format according to the present embodiment. The movement information includes a movement speed and a movement direction. The broadcast reception quality represents the quality of broadcast data received by a broadcast wave. Examples of the broadcast reception quality include a loss rate of broadcast data included in a broadcast wave received by the client 5. Since broadcast data according to this embodiment is stored in a packet and transmitted, in this embodiment, a packet loss rate is used as broadcast reception quality.

  The layer request includes layer identification information (layer ID) indicating a layer requested by the client 5 and coordinates of the position of the client 5 at the time of the request. The lost resource is a resource that is missed by the broadcast wave. As the lost resource, for example, a resource that is distributed and stored in a plurality of packets and that partially loses a packet can be cited. The resource for which reception has been completed is a resource for which reception by broadcast waves has been completed. The resource that has started browsing is a resource that the user of the client 5 has actually started browsing.

  The client 5 periodically creates a user profile and uploads the user profile to the schedule server 1 via the communication network.

Next, the schedule server 1 according to the present embodiment will be described in detail with reference to FIG. FIG. 2 is a block diagram showing a configuration of the schedule server 1 shown in FIG.
2, the schedule server 1 includes a communication unit 11, a user profile information collection unit 12, a user profile information database unit (user profile information DB unit) 13, a resource configuration information acquisition unit 14, a resource priority calculation unit 15, a broadcast schedule. A creation unit 16 and a resource download request unit 17 are provided.

  The communication unit 11 performs data communication between the servers 2 and 3 and the client 5. The user profile information collection unit 12 receives the user profile sent from the client 5 from the communication unit 11. The user profile information collection unit 12 stores the user profile sent from each client 5 in the user profile information DB unit 13. The user profile information DB unit 13 stores the user profile of each client 5 in a database.

  The resource configuration information acquisition unit 14 receives the resource configuration information sent from the content server 2 from the communication unit 11 and holds it. The resource priority calculation unit 15 calculates a priority for each resource (resource priority) using the user profile in the user profile information DB unit 13 and the resource configuration information in the resource configuration information acquisition unit 14. A method for calculating the resource priority will be described later.

  The broadcast schedule creation unit 16 schedules each resource within the broadcast frame in the order of higher priority according to the resource priority, and creates a broadcast schedule for the resource. The broadcast schedule creation unit 16 creates a broadcast schedule at regular intervals. The broadcast schedule created by the broadcast schedule creation unit 16 is transmitted to the content server 2 by the communication unit 11.

  The resource download request unit 17 creates a request for distributing resources that have been missed from the broadcast schedule via the communication network. This distribution request includes a resource ID indicating a resource to be distributed and a communication address indicating the distribution destination client 5. The distribution request created by the resource download request unit 17 is transmitted to the resource download server 3 by the communication unit 11.

Next, a resource priority calculation method according to this embodiment will be described.
As shown in FIG. 2, the resource priority calculation unit 15 includes a mesh priority calculation unit 21, a layer / resource priority calculation unit 22, and a resource itself priority calculation unit 23. The mesh priority calculation unit 21 calculates a mesh priority. The layer resource priority calculation unit 22 calculates a layer resource priority. The resource itself priority calculation unit 23 calculates the resource itself priority.
First, a method for calculating the mesh priority, the layer resource priority, and the resource priority in each of the priority calculation units 21, 22, and 23 will be described.

[Mesh priority (zone priority)]
The mesh priority is a priority for each area. In this embodiment, since the area is divided into meshes, the area priority is referred to as mesh priority. Hereinafter, the “mesh” refers to an area divided into a mesh shape.

  The mesh priority indicates which mesh resource is preferentially broadcast. The mesh priority (M) for one mesh (target area) is calculated using the following equation [Equation 2].

However,
Em is the priority of the target area for each terminal receiving broadcast data (terminal individual area priority),
n is the number of broadcast data receiving terminals,
m is any integer from 1 to n (represents a receiving terminal for which the terminal individual area priority is to be calculated),
Ap is the average packet loss rate (percentage) of broadcast data in the target area,
Apm is the average packet loss rate (percentage) of broadcast data in the area where the receiving terminal (m) is located,
θ _m is an angle formed by the moving direction of the receiving terminal (m) with respect to a straight line connecting the coordinates (x, y) of the center point of the target area and the coordinates (lx _m , ly _m ) of the position of the receiving terminal (m) ( −90 ° ≦ θ _m ≦ 90 °),
r _m is the distance of the receiving terminal (m) is advanced over a period of time,
(Lx _m , ly _m ) is the coordinates of the position of the receiving terminal (m),
(X, y) is the coordinates of the center point of the target area,
It is.

The number (n) of receiving terminals is calculated as the number of clients 5 corresponding to the user profile in the user profile information DB unit 13. The average packet loss rate (Ap) is calculated by averaging the packet loss rates in the user profile of the client 5 located in the target area. The average packet loss rate (Apm) is calculated by averaging the packet loss rates in the user profile of the client 5 located in the area where the client 5 (m) is located. The angle (θ _m ) is the moving direction of the client 5 (m) with respect to a straight line connecting the coordinates (x, y) of the center point of the target area and the coordinates (lx _m , ly _m ) of the client 5 (m). Is calculated as (−90 ° ≦ θ _m ≦ 90 °). The distance (r _m ) is calculated from the moving speed of the client 5 (m) as a distance that proceeds in a predetermined period. The coordinates (lx _m , ly _m ) are obtained as the coordinates of the position of the client 5 (m). The coordinates (x, y) are the coordinates of the center point of the target area and are determined in advance.

  As shown in [Expression 2], the mesh priority (M) for one mesh is the sum of the terminal individual area priority (Em) calculated for each receiving terminal with respect to the mesh. The mesh priority (M) is normalized to a range of 0 ≦ M ≦ 100.

  The terminal individual area priority (Em) for one receiving terminal (m) is the product of four terms (first term, second term, third term, fourth term). These four terms (first term, second term, third term, fourth term) will be described below.

  The first term is calculated using the average packet loss rate (Ap) and the average packet loss rate (Apm). The first term is a priority that increases so that the broadcast reception quality in the target area is worse than the broadcast reception quality in the area where the receiving terminal (m) is located. The first term is a term for increasing the priority of the target mesh that is the destination when the receiving terminal (m) moves to a mesh having a lower electric field strength than the mesh at the current position. This is intended to send the destination mesh resource first before the field strength of the mesh where the receiving terminal (m) is located becomes weaker due to movement.

  The second term is calculated using the average packet loss rate (Apm). The second term is a priority that decreases as the broadcast reception quality in the area where the receiving terminal (m) is located is poor. The second term is a term for reducing the influence of the position information of the receiving terminal (m) on the priority of the target mesh itself when the electric field strength of the mesh at the current position of the receiving terminal (m) is weak. This is intended to eliminate the influence of the receiving terminal (m) in the mesh with weak electric field strength because it may not receive resources due to packet loss.

The third term is a cosine function value (cosine value) of the angle (θ _m ). The third term is a priority that increases as the receiving terminal (m) moves toward the target area. The third term is a term for raising or lowering the priority depending on whether the receiving terminal (m) is moving toward the target mesh. Note that the angle (θ _m ) is set to a range of −90 ° ≦ θ _m ≦ 90 °, and the third range when the other range, that is, the receiving terminal (m) is moving in the direction opposite to the target mesh. The value of the term is set to 0 so as not to affect the priority of the target mesh itself.

The fourth term is calculated using the distance (r _m ), the coordinates (lx _m , ly _m ), and the coordinates (x, y). The fourth term is a priority that increases as the distance between the target area and the area where the receiving terminal (m) is located is shorter. Furthermore, the fourth term is a priority in which the way of increasing the priority increases as the distance between the target area and the area where the receiving terminal (m) exists is inversely proportional to the moving speed of the receiving terminal (m). The fourth term is a term for raising or lowering the priority depending on how close the receiving terminal (m) is to the target mesh. Further, the distance (r _m ) depends on the moving speed of the receiving terminal (m). Thus, the fourth term has a thin and wide influence on the priority of the target mesh from the target mesh to a distant mesh when the moving speed of the receiving terminal (m) is fast, while the receiving terminal (m) When the moving speed is slow, the priority of the target mesh is narrowly and deeply affected from the target mesh to a nearby mesh.

  In the present embodiment, the product obtained by multiplying all the first to fourth terms is used as the terminal individual area priority (Em), but is not limited to this. As the terminal individual area priority (Em), the product of any one term or a plurality of terms among the first term, the second term, the third term, or the fourth term may be used.

[Layer resource priority]
The layer resource priority is a priority obtained by combining a layer priority indicating which layer's resource is preferentially broadcast and a resource related priority indicating which resource is preferentially broadcast. The layer resource priority is calculated for each resource.

The layer resource priority (U) for a certain resource (target resource) is calculated using the following equation.
U = EL × ER
Here, EL is the priority of the layer to which the target resource belongs (layer priority), and ER is the priority related to the target resource (resource related priority).

  The layer priority (EL) and the resource related priority (ER) are calculated using the following equation [Equation 3].

However,
_Elm is the layer priority for each receiving terminal of broadcast data,
_Erm is the resource related priority for each receiving terminal of broadcast data,
n is the number of broadcast data receiving terminals,
m is any integer from 1 to n (represents a receiving terminal that is a target of calculation of layer priority and resource related priority),
It is.

As the layer priority (E _lm ) and the resource related priority (ER), any one of “1”, “2”, and “3” is given as a value representing the priority. The priority “3” represents the highest priority. The priority “1” represents the lowest priority. The priority “2” represents a medium priority. The priority “2” is an initial value of the layer priority (E _lm ) and the resource related priority (ER).

The layer priority (E _lm ) of a certain receiving terminal (m) is changed to the priority “3” when there is a layer request for the layer to which the target resource belongs in the user profile of the client 5 (m). The layer request is a distribution request to the layer itself. The layer request is generated when the user selects and uses a specific layer on the client 5 from the layer selection menu. Corresponding to this, the corresponding layer priority is raised.

  The resource-related priority (ER) of a certain receiving terminal (m) is changed based on information on the lost resource, the resource that has been received, and the resource that has started browsing in the user profile of the client 5 (m).

  If there is a target resource as a lost resource, the resource-related priority (ER) is changed to the priority “3”. The lost resource is a resource that the client 5 could not receive due to packet loss or the like. For this reason, the priority of the target resource is increased for retransmission.

  If there is a target resource as a resource that has been received, the resource-related priority (ER) is changed to the priority “1”. The resource for which reception has been completed is a resource for which reception by the client 5 has been completed. For this reason, the priority of the target resource is lowered.

  If there is a target resource as a resource that has started browsing, the resource-related priority (ER) of the resource linked to the target resource is changed to the priority “3”. The resource that has started browsing is a resource that the user has started browsing on the client 5. For this reason, since the possibility that the resource linked to the resource that has started browsing is viewed is increased, the priority of the resource linked to the target resource is increased.

As shown in [Equation 3], the layer priority (EL) and the resource-related priority (ER) for a certain target resource are the layer priority (ER) calculated for each receiving terminal with respect to the target resource. E _lm ), the sum of resource related priorities (ER). The layer priority (EL) and the resource related priority (ER) are normalized in the range of 0 ≦ EL ≦ 100 and 0 ≦ ER ≦ 100.

[Resource priority]
The resource itself priority is the priority of the target resource itself. The resource priority (R) for a certain target resource is calculated using the following equation.
R = E _f × E _r × E _p
However, E _f is the freshness of the target resource, _Er is the update frequency of the target resource, and _Ep is the importance of the target resource.

The freshness (E _f ) of the target resource is the reciprocal of the difference between the current time (currentTime) and the update time (modifiedTime) of the target resource, and is calculated from the following equation. The freshness (E _f ) becomes a larger value (higher priority) as new resources are added.
E _f = 1 ÷ (“currentTime” − “modifiedTime”)

The update frequency (E _r ) of the target resource is the reciprocal of the update period (refreshInterval) of the target resource, and is calculated from the following equation. The update frequency (E _r ) has a larger value (high priority) as the resource has a shorter update period, that is, a greater update frequency.
E _r = 1 ÷ “refreshInterval”

The importance (E _p ) of the target resource is predetermined by the resource creator. The importance (E _p ) is a value in the range of 0 ≦ E _p ≦ 100.

The resource priority (R) itself is a product of the freshness (E _f ), the update frequency (E _r ), and the importance (E _p ) of the target resource. The resource priority (R) itself is normalized to a range of 0 ≦ R ≦ 100.

  Next, a method in which the resource priority calculation unit 15 calculates the resource priority will be described. The resource priority calculation method includes the following four methods (methods 1, 2, 3, 4) described below. The resource priority (P) is calculated for each resource.

[Resource priority calculation method 1]
The resource priority (P) of a certain resource (target resource) is calculated by the following equation.
P = Mesh priority (M)
However, the mesh priority (M) is calculated using the mesh to which the target resource belongs as the target area. The resource priority (P) is normalized to a range of 0 ≦ P ≦ 100.

[Resource priority calculation method 2]
The resource priority (P) of a certain resource (target resource) is calculated by the following equation.
P = mesh priority (M) × layer resource priority (U)
However, the mesh priority (M) is calculated using the mesh to which the target resource belongs as the target area. The layer resource priority (U) is for the target resource. The resource priority (P) is normalized to a range of 0 ≦ P ≦ 100.

[Resource priority calculation method 3]
The resource priority (P) of a certain resource (target resource) is calculated by the following equation.
P = mesh priority (M) x resource priority (R)
However, the mesh priority (M) is calculated using the mesh to which the target resource belongs as the target area. The resource priority (R) itself relates to the target resource. The resource priority (P) is normalized to a range of 0 ≦ P ≦ 100.

[Resource priority calculation method 4]
The resource priority (P) of a certain resource (target resource) is calculated by the following equation.
P = mesh priority (M) × layer resource priority (U) × resource itself priority (R)
However, the mesh priority (M) is calculated using the mesh to which the target resource belongs as the target area. The layer resource priority (U) and the resource itself priority (R) are for the target resource. The resource priority (P) is normalized to a range of 0 ≦ P ≦ 100.

  According to the resource priority (P) calculated by any one of the methods described above, scheduling of each resource to the broadcast frame is performed in the order of higher priority, and a broadcast schedule is created.

  FIG. 3 is a flowchart showing a broadcast schedule creation procedure according to the present embodiment. In FIG. 3, in step S1, scheduler initialization is performed. As a result, the resource priority (P) calculation function and the broadcast schedule creation function are initialized.

  Next, in steps S2 and S3, resource configuration information is acquired when the content (resource) is updated. Next, in step S4, a user profile is acquired. Next, in step S5, the mesh priority (M) is calculated. Next, in step S6, the layer resource priority (U) is calculated. Next, in step S7, the resource itself priority (R) is calculated. Next, in step S8, the resource priority (P) is calculated and normalized.

  Next, in step S9, a broadcast schedule is created according to the resource priority (P). Next, in step S10, the created broadcast schedule is transmitted to the content server 2. Next, in step S11, the scheduler is terminated.

  According to the above-described embodiment, broadcast scheduling of geographic information is performed using area priority based on the position, movement, and broadcast reception quality of a broadcast data receiving terminal. In particular, since the spatial characteristics such as the current movement status of the client group and the broadcast reception environment of the existing location are used, a broadcast schedule suitable for the spatial status of the current client group can be created. Thereby, the outstanding effect that geographical information can be broadcast-distributed by the appropriate broadcast schedule according to the position of a receiver (receiving terminal) is acquired.

  Furthermore, in addition to the area priority, further scheduling of each resource using the layer resource priority using the user processing event (acquisition request, browsing area), the current client group It is possible to create a broadcast schedule according to the request.

  Moreover, in addition to the area priority, the broadcast schedule of each resource is created using the resource priority using the freshness of the resource itself, thereby creating a broadcast schedule corresponding to the freshness of the resource itself. Can do.

  In addition, it is possible to perform care for individual recipients by distributing geographic information leaked from the broadcast schedule via a communication network.

Further, a program for realizing the function of the schedule server 1 shown in FIG. 2 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed, whereby broadcasting is performed. Schedule creation processing may be performed. Here, the “computer system” may include an OS and hardware such as peripheral devices.
“Computer-readable recording medium” refers to a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, the broadcast distribution of geographic information may be performed using a communication network. The present invention can also be applied to a broadcasting system using the Internet, for example.

It is a block diagram which shows the whole structure of the geographic information delivery system which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the schedule server 1 shown in FIG. It is a flowchart which shows the broadcast schedule preparation procedure which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Schedule server apparatus, 2 ... Content server apparatus, 3 ... Resource download server apparatus, 4 ... Broadcast server apparatus, 5 ... Client terminal apparatus, 11 ... Communication part, 12 ... User profile information collection part, 13 ... User profile information DB , 14 ... Resource configuration information acquisition unit, 15 ... Resource priority calculation unit, 16 ... Broadcast schedule creation unit, 17 ... Resource download request unit, 21 ... Mesh priority calculation unit, 22 ... Layer resource priority calculation unit, 23 ... Resource itself priority calculation unit

Claims (8)

It is a broadcast schedule creation device that creates a schedule for broadcasting geographic information of multiple areas,
A communication means for receiving information related to the position, movement and broadcast reception quality of the broadcast data receiving terminal via a communication network;
Based on information received via the communication network, area priority calculating means for calculating area priority indicating which area geographical information is preferentially broadcast;
Broadcast schedule creating means for scheduling geographic information of each area according to the area priority,
A broadcast schedule creation device characterized by comprising: The area priority is composed of terminal individual area priority calculated for each receiving terminal,
The terminal individual area priority is
The priority that the broadcast reception quality in the target area rises worse than the broadcast reception quality in the area where the receiving terminal is located, the priority that lowers the broadcast reception quality in the area where the receiving terminal is bad, and the receiving terminal is the target area A priority that increases as the user moves toward or a priority that increases as the distance between the target area and the area where the receiving terminal is located is a combination of one or more.
The broadcast schedule creation apparatus according to claim 1.   The terminal individual area priority is configured such that the way of increasing the priority increases as the distance between the target area and the area where the receiving terminal is located is inversely proportional to the moving speed of the receiving terminal. The broadcast schedule creation device according to claim 2. The area priority (M) and the terminal individual area priority (Em) are calculated by the following equations:

However,
m is any integer from 1 to n (represents a receiving terminal for which the terminal individual area priority is to be calculated),
n is the number of receiving terminals,
Ap is the average loss rate (percentage) of broadcast data in the target area,
Apm is the average loss rate (percentage) of broadcast data in the area where the receiving terminal (m) is located,
θ _m is an angle formed by the moving direction of the receiving terminal (m) with respect to a straight line connecting the coordinates (x, y) of the center point of the target area and the coordinates (lx _m , ly _m ) of the position of the receiving terminal (m) ( −90 ° ≦ θ _m ≦ 90 °),
r _m is the distance of the receiving terminal (m) is advanced over a period of time,
(Lx _m , ly _m ) is the coordinates of the position of the receiving terminal (m),
(X, y) is the coordinates of the center point of the target area,
The broadcast schedule creation device according to claim 3, wherein: The geographic information is composed of a plurality of types of information and is layered so that one type of information forms one layer,
The one type of information consists of resources for each area,
The communication means receives information related to a layer request for the receiving terminal, a lost resource, a resource that has been received, and a resource that has started browsing via a communication network,
The broadcast schedule creation device calculates a layer priority indicating which layer of geographic information is preferentially broadcast based on the layer request, and preferentially broadcasts which resource based on the information related to the resource A resource / resource priority calculating means for calculating a resource / resource priority indicating whether or not to perform a layer / resource priority by combining the layer priority and the resource-related priority;
The broadcast schedule creation device according to claim 1, wherein the broadcast schedule creation means schedules geographic information of each resource according to the area priority and the layer resource priority. The geographic information is composed of a plurality of types of information and is layered so that one type of information forms one layer,
The one type of information consists of resources for each area,
The broadcast schedule creation device comprises resource itself priority calculation means for calculating the resource itself priority including the freshness, update frequency and importance of the resource,
The broadcast schedule creation device according to claim 1, wherein the broadcast schedule creation means schedules geographic information of each resource according to the area priority and the resource itself priority. The broadcast schedule creation device according to any one of claims 1 to 6,
Broadcast distribution means for broadcasting geographic information according to the broadcast schedule created by the broadcast schedule creation device;
Communication distribution means for distributing geographical information leaked from the broadcast schedule created by the broadcast schedule creation device via a communication network;
A geographic information distribution system characterized by comprising: A computer program for creating a schedule for broadcasting geographical information of a plurality of areas,
An area priority calculation function for calculating an area priority indicating which area geographical information is preferentially broadcast based on information related to the position, movement and broadcast reception quality of the receiving terminal of the broadcast data;
A broadcast schedule creation function for scheduling geographic information of each area according to the area priority;
A computer program for causing a computer to realize the above.

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