JP3473823B2 - Transmission device and transmission method, reception device and reception method, transmission / reception system and transmission / reception method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device and a transmission method, a reception device and a reception method, and a transmission / reception system and a transmission / reception method. A transmitting apparatus and a transmitting method, a receiving apparatus and a receiving method, a transmitting / receiving system, and a transmitting / receiving method that are suitable for use, when delivering data by IP (Internet Protocol) multicast, and when delivering other data to an unspecified number Regarding the method.

[0002]

2. Description of the Related Art Various methods have been proposed as data distribution methods. For example, on the current Internet, HTTP (Hyper Text Transfer Protocol) is used.
TCP / IP (Transmission Control Prot)
A protocol based on ocol / Internet Protocol) is adopted. In TCP / IP, a receiving side receiving data distribution makes a call to the data transmitting side, and a connection is established between the transmitting side and the receiving side every time data is transmitted / received. Since it is established, highly reliable data distribution can be performed. However, on the other hand, the load on the transmission side and the network becomes large, and it may be difficult to perform efficient data distribution.

In other words, if the number of terminals receiving data is increased and the access to the server providing the data is concentrated, a great load is placed on the server and the network, and even if the data is requested, the data is not obtained. , It could take a lot of time.

Therefore, in recent years, W3C (World Wide W
At eb Consortium, DRP (Distribution and
Replication Protocol) has been proposed.
In DRP, when data is updated in a certain database, the updated data itself is not distributed to other databases dispersed in many regions, but the data before update and the data after update are distributed. Only the difference information with respect to the above data is individually delivered. Then, in the database to which the difference information is distributed, the data before the update is updated based on the difference information.

Therefore, in the data distribution method using DRP, since the difference information is transmitted, the amount of information flowing on the network can be reduced rather than transmitting the data itself. However, even so, for example,
When access is concentrated from an enormous number of terminals on a national scale or on a global scale, the load on the server or network increases, making it difficult to perform efficient data distribution.

In the above-mentioned data distribution using TCP / IP and DRP, a connection is established and data is exchanged between the transmitting side and the receiving side. On the other hand, data is exchanged in a connectionless manner. For example, UDP (User Datagram) such as IP multicast
There is also a data distribution method using the Protocol. UDP
Since data distribution by T is connectionless, T
Although the reliability of data is lower than that of data distribution performed by establishing a connection such as CP / IP, the load on the transmission side and the network can be reduced.

However, even in the case of UDP, as long as the current Internet is used, it is necessary to individually distribute the data to each of a large number of terminals. Therefore, the distribution of the data is automatically performed by the server. Even if it is performed, the load on the server and the network increases due to the increase in the number of terminals, and it becomes difficult to perform efficient data distribution.

[0008] Therefore, at present, there is a technique called multi-feed which reduces the load on the transmission side and the network by efficiently centralizing / dispersing the data exchanged for providing various services on the Internet. Proposed.

However, even in the case of multi-feed, as long as the current Internet is used, the load on the server and the network increases due to the increase in the number of terminals as in the case of the UDP, so that efficient data distribution is possible. It will be difficult to do.

[0010]

In any of the above data distribution methods, when data distribution is performed via the Internet connected by a physical line such as a cable, the It is inevitable that the load on the server and network will increase with the increase.

Therefore, there has been proposed a method of distributing data using, for example, a broadband satellite line or terrestrial broadcast line capable of simultaneous broadcasting over a wide area. In this case, the load on the server and the network is not affected by the increase in the number of terminals.

By the way, even when data is distributed using a satellite line or the like, from the viewpoint of improving the efficiency of data distribution, for example, as in the above-described DRP data distribution method, the data itself is not. Instead, it is preferable to send the difference information.

However, when the difference information is transmitted using a satellite line or the like, on the receiving side, the difference information is in which channel (in the case of the satellite line, which transponder and which frequency band), and further, Since it is not known when it will be broadcast, it is necessary to constantly monitor all channels, which increases the burden on the receiving side.

The present invention has been made in view of such a situation, and makes it possible to efficiently perform data distribution while suppressing an increase in load on the receiving side.

[0015]

When a content registered in a database is updated, the transmitting apparatus of the present invention reflects the updated content in the content before the update.
Based on the update method, including the description of the update method
A reflection data generating means for generating reflection data for reflecting the content before the update, a fact that the content registered in the database has been updated, and the update of the content.
Description of acquisition method of reflection data to reflect new contents
And a notification data generating means for generating notification data including Reflection data generation means
To generate one or more reflection data
You can The transmission means is described in the notification data.
You can acquire the import data using the described acquisition method.
Send the reflection data so that
You can The transmission means broadcasts the reflected data simultaneously.
Broadcast network or two-way communication possible
Can be sent over a two-way network
it can. The notification data generation means is a reflection data acquisition method.
When there are multiple, each description of the multiple acquisition methods
To generate multiple notification data including
You can The transmission means can broadcast the broadcast data
Broadcasting network or two-way communication
Can be sent over the network
It

In the transmission method of the present invention , when the content registered in the database is updated , the description of the reflection method for reflecting the updated content in the content before the update is described.
Include the content before the update based on the method of reflecting the updated content.
Generate the reflection data to reflect on the
The fact that the content has been updated and that content has been updated
Describe how to get the reflected data to reflect the contents
It is characterized in that the notification data including the information is generated.

The receiving apparatus of the present invention, that and the content content registered in the database is updated
Of the acquisition method of reflection data to reflect the update contents of
A notification data receiving unit including a description, a reflection data receiving unit that receives the reflection data including a description of a reflection method for reflecting the update content of the content notified of the update by the notification data based on the notification data, and the reflection data receiving unit. And an updating unit for updating the content based on the content. The reflected data receiving means includes the notification data.
Based on the method of acquiring the reflected data,
Data can be received. Notification data reception
The means is that each description of multiple acquisition methods of reflection data
When receiving multiple notification data included,
Selecting means for selecting one of the plurality of notification data of
Further, the reflection data receiving means is provided by the selecting means.
Acquisition method of reflection data included in selected notification data
To get that reflection data based on
You can The selection means is used to select the counters included in the plurality of notification data.
Evaluate the acquisition method of video data and based on the evaluation result
Therefore, it is possible to select one notification data.
It The broadcast data is received by the broadcast data receiving means.
Possible broadcast network or two-way communication
Can be received over a directional network
Wear. The reflection data receiving means broadcasts the reflection data at once.
Broadcast network or two-way communication possible
Can be received over a two-way network
it can.

The receiving method according to the present invention is based on the fact that the content registered in the database has been updated and the content.
Of the acquisition method of reflection data to reflect the update contents of
Receive the notification data including the description, and based on the notification data,
It is characterized in that the reflection data including the description of the reflection method for reflecting the update content of the content notified of the update by the notification data is received, and the content is updated based on the reflection data.

The transmission / reception system of the present invention is a description of a reflection method for reflecting the updated contents on the contents before updating when the contents registered in the database are updated.
And the contents before update based on the method of reflecting the updated contents.
Reflection data generation means for generating reflection data for reflecting on Tents, and the fact that the contents registered in the database have been updated and the updated contents of the contents are reflected.
Notification data generating means for generating notification data including a description of a method of acquiring reflected data for causing the notification data receiving means for receiving the notification data, based on the notification data, the content of which the update is notified by the notification data The present invention is characterized by comprising: reflection data receiving means for receiving reflection data including a description of a reflection method for reflecting the updated content; and updating means for updating the content based on the reflection data.

According to the transmission / reception method of the present invention, when the content registered in the database is updated , the description of the reflection method for reflecting the updated content on the content before the update is described.
Include the content before the update based on the method of reflecting the updated content.
Generate the reflection data to reflect on the
The fact that the content has been updated and that content has been updated
Describe how to get the reflected data to reflect the contents
While generating the notification data including, while receiving the notification data,
Based on the notification data, a reflection method of reflecting the update content of the content notified of the update by the notification data
It is characterized in that the reflection data including the description is received, and the content is updated based on the reflection data.

In the transmitting device and the transmitting method of the present invention , when the content registered in the database is updated, the content of the update is reflected in the content before the update , and the update content is reflected. Based on method
Data to be reflected in the content before update
Is generated , and the contents registered in the database have been updated and the updated contents are reflected.
Data including description of acquisition method of reflection data for
But Ru is generated.

[0022]

In the receiving apparatus and the receiving method of the present invention , the fact that the content registered in the database is updated and the updated content of the content are reflected.
Of receiving broadcast data including a description of the method for acquiring the reflected data
It is, based on the notification data, reflecting side for reflecting the update content of the content update was broadcast by the broadcast data
It reflects data including a description of the law Ru is received. Then, based on the reflection data, content is Ru been updated.

[0024]

In the transmission / reception system and the transmission / reception method of the present invention , when the content registered in the database is updated, a description of a reflection method for reflecting the updated content on the content before the update is included, How to reflect the updated contents
Based on the law, the reflection data to be reflected on the content before update is generated , and the fact that the content registered in the database has been updated and the update content of the content are displayed.
Broadcast <br/> knowledge data including a description of the method of obtaining the reflection data to reflect the Ru is generated. And, of the broadcast data is received
It is, based on the notification data, reflecting side for reflecting the update content of the content update was broadcast by the broadcast data
Reflection data is received that includes a legal description . Based on the reflection data, content is updated.

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

[0032]

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG . 1 is a data distribution system to which the present invention is applied (in the present specification, a system means a logical assembly of a plurality of devices, and the devices of the respective configurations have the same housing. It does not matter whether it is in the body or not).

The information providers A to C have databases 1a to 1c in which various data are stored. The databases 1a to 1c include, for example, traffic information, weather information, stock price information, and other data that change in real time, data that does not change in real time, text data, image data, voice data, and a computer. Everything such as programs (including structured data provided by pointcast, data configuring a home page provided by WWW (World Wide Web), etc.) can be stored. Here, for example, a set of information (generally, for example, one file) that configures traffic information, weather information, and the like is hereinafter appropriately referred to as content or object.

Among the objects (contents) stored in the databases 1a to 1c, updated ones (including new ones, changed ones, and deleted ones) are delivered to the server 2, In the server 2, the content stored in the database 3 is updated to the delivered object (in addition to the case where the object stored in the database 3 is changed to the delivered object, the delivered object). Is newly stored in the database 3, and the database 3
Including the case where the object stored in is deleted). When the storage content of the database 3 is updated, the server 2 generates data (hereinafter referred to as a subject) (reflection data) for reflecting the updated content on the object before the update. That is, the server 2 reflects the update content of the object on the object before the update, and generates the subject including the description of the reflection method for updating the object. Here, as the description of the reflection method, for example, an execution-type computer program (patch data) for making an object before update an object after update, or a difference between an object after update and an object before update and so on.

Further, the server 2 also generates data for notifying that the object has been updated (hereinafter, appropriately referred to as event) (notification data).

Here, the event includes a description of the method of acquiring the subject for reflecting the update content of the object notified of the update by the event. That is, the subject may be transmitted from the server 2 via the broadcast network 4 at a predetermined time, and in this case, the event includes the time at which the subject is broadcast, the channel, the data rate, and the like. Described as a method. Further, the subject may be associated with a URL (Uniform Resource Locator) and transmitted via the communication network 6. In this case, the event may include the URL associated with the subject or the subject. A telephone number for accessing the managed server is described as the acquisition method.

When there are a plurality of acquisition methods for a subject, an event is generated for each of the plurality of acquisition methods. That is, for example, the subject is
If you broadcast on different times or on different channels,
Events for the subject are generated for each of the different times and different channels. Furthermore, when the subject is provided in association with the URL, an event is also generated for that URL. However, it is also possible to describe a plurality of subject acquisition methods in one event.

Further, the description of the reflection method for updating the object does not need to be included in one subject as a whole, and it is divided into a plurality of parts and a plurality of subjects each containing the description of the plurality of parts are included. It is also possible to configure. However, in this case, the object can be updated only after all of the plurality of subjects are prepared.

As described above, the method for acquiring the subject is described in the event. The existence of the subject acquired by the acquisition method means that the object updated by the subject exists. It turns out that. Therefore, the event serves to notify that the object has been updated, by the existence of the event.

When an event in which the subject and a method for obtaining the subject are described is generated in the server 2, these are generated according to a predetermined transmission schedule, for example, satellite line, CATV network, terrestrial wave, and others. , At least via a broadcasting network 4 which is a one-way network capable of simultaneously broadcasting to a large number of users,
For example, IRD (Integrated Receever and Decoder)
Or a STB (Set Top Box) or the like.

That is, when the subject is generated and the event in which the acquisition method is described is generated, basically, the event is first transmitted. Furthermore, in the event sent in this way, if the subject acquisition method includes the subject's broadcast time or channel, the subject will be transmitted on that channel at that broadcast time. It

Here, in the server 2, the above-mentioned transmission schedule is established as follows. That is, for example, first, a subject transmission schedule is set (broadcast time, broadcast channel, etc. are determined). Furthermore, according to the transmission schedule,
In the event, the broadcast time and broadcast channel of the subject are described. Then, the transmission schedule of the event is set.

When the subject is provided in association with the URL, an event for the URL is generated and transmitted. In this case, the subject is the domain name of the URL included in the event. It is placed under the control of the server corresponding to.

That is, if the server corresponding to the domain name of the URL included in the event is, for example, the server 2,
After the subject is generated in the server 2, the UR
It is associated with L and is under the control of the server 2. In this case, when the URL is accessed to the server 2 via the communication network 6, the server 2 sends the subject associated with the URL via the communication network 6.

If the server corresponding to the domain name of the URL included in the event is, for example, the mirror server 7, the subject is generated in the server 2 and then delivered to the mirror server 7 to be transmitted to the mirror server 7. Be under control. In this case, when the URL is accessed to the mirror server 7 via the communication network 6, the mirror server 7 transmits the subject associated with the URL via the communication network 6. Note that the subject is distributed to the mirror server 7 in the same manner as the subject is distributed from the server 2 to the receiving terminal 5. That is, from the viewpoint of the server 2, the receiving terminal 5 and the mirror server 7 are equivalent to each other. Therefore, the server 2 distributes data without being aware of the receiving terminal 5 or the mirror server 7. .

The event transmitted (distributed) through the broadcast network 4 as described above is received by the user's receiving terminal 5 (the event from the server 2 is also received by the mirror server 7, Since the processing of the mirror server 7 performed thereby is basically the same as the processing performed by the receiving terminal 5, its description is omitted). At the receiving terminal 5,
Among the received events, the one for the object desired by the user is selected, and the subject is acquired based on the selected event.

That is, for example, when the event includes the subject broadcast time and channel as the description of the subject acquisition method, the server 2
At that broadcast time, the subject on that channel
Since it is transmitted via the broadcast network 4, the receiving terminal 5 receives the subject thus transmitted.

Further, for example, when the event includes a URL associated with the subject as a description of the method of obtaining the subject, the receiving terminal 5 instructs the server corresponding to the domain name of the URL. For example, analog public networks and ISDN (Integrated Service)
s Digital Network), the Internet, or another communication network 6 which is a network capable of at least two-way communication, and requests and receives a subject.

Specifically, if the server corresponding to the domain name of the URL included in the event is, for example, the server 2, the subject is under the control of the server 2, so the receiving terminal 5 is Via the communication network 6,
The server 2 is accessed and the subject is acquired.

Further, if the server corresponding to the domain name of the URL included in the event is, for example, the mirror server 7, the subject is under the control of the mirror server 7, and therefore the receiving terminal 5 communicates. The mirror server 7 is accessed via the network 6 to acquire the subject. In this case, the mirror server 7 needs to acquire the subject in advance in the same manner as the receiving terminal 5 acquires the subject.

After receiving the subject as described above, the receiving terminal 5 updates the object based on the reflection method described in the subject.

As described above, when there are a plurality of subject acquisition methods, the server 2 generates an event for each of the plurality of acquisition methods.
It is transmitted via the broadcasting network 4, but in this case,
At the receiving terminal 5, one of the plurality of events in which the acquisition method for the same subject is described is selected, and the subject is acquired based on the selected event.

According to the data delivery system as described above, the event in which the subject acquisition method is described is
The data is distributed all over the broadcasting network 4, and the receiving terminal 5 obtains the subject based on the event and updates the object. Therefore, the load of the receiving terminal 5 is prevented from increasing and the data is efficiently distributed. It can be performed.

That is, generally, the amount of data of the subject in which the method of updating the object is described is large, and since the subject is generated in response to the update of the object, it is not known when it will occur. Therefore, if only such a subject that occurs irregularly and has a large amount of data is to be transmitted via the broadcast network 4 as early as possible, the server 2 uses the currently vacant channel, Subject must be sent. However, in this case, the receiving terminal 5 needs to wait for a subject that does not know when and on which channel the data will be transmitted, which increases the processing load.

On the other hand, since the event includes the description of the method of acquiring the subject, the data amount thereof is generally much smaller than that of the subject including the description of the method of updating the object. Therefore, for example, , It is possible to transmit on a narrow band channel (and even at a fixed time). Therefore,
In this case, the receiving terminal 5 only needs to receive an event transmitted on that channel (and at a certain fixed time), and its load is much smaller than when waiting for the transmission of the subject. Complete.

Furthermore, in the present embodiment, the event is
Broadcast network capable of simultaneous broadcasting over a wide area 4
Therefore, the increase in the number of receiving terminals 5 does not affect the load on the server 2 or the broadcasting network 4.

In the present embodiment, a change method for reflecting the changed contents on the object before the change is described instead of transmitting the changed object itself when the object is changed. Since the subject is transmitted, efficient data distribution can be performed.

The broadcast network 4 and the communication network 6 do not have to be physically separate networks. That is, if the broadcasting network 4 is, for example, CATV
In the case of the network, the CATV network can be used as the communication network 6. Also,
Data distribution by the broadcasting network 4 is performed by, for example, IP (Internet Protocol) using the Internet or the like.
l) In the case of multicasting, the communication network 6 can be configured by the Internet.

Further, the transmission of data (event and subject) from the server 2 to the receiving terminal 5 is performed by scrambling, for example, whereby only a specific user (user who has a reception contract) can transmit the data. It is also possible to enable reception.

Next, with reference to FIGS. 2 and 3, a hierarchical model of a transmission / reception protocol of events and subjects in the data distribution system of FIG. 1 will be described.

For example, as shown in FIG. 2, the transmission / reception protocol of events and subjects includes an object access layer (Object Access Layer), a service interface layer (Service Interface Layer), and an object database layer (Object Databas layer).
e Layer).

In the object access layer, a sender (Object Supplier) providing an object and a receiver (Object Consume) receiving the object are provided.
r) and are specified. In FIG. 1, focusing on the relationship between the server 2 and the receiving terminal 5, the server 2 or the receiving terminal 5 is the transmitting side or the receiving side, respectively. Also, paying attention to the relationship between the server 2 and the mirror server 7, the server 2 or the mirror server 7 is the transmitting side or the receiving side, respectively. Although not described in FIG. 1, the mirror server 7 can receive an event from the server 2 and deliver the event to the receiving terminal 5.
In this case, paying attention to the relationship between the receiving terminal 5 and the mirror server 7, the receiving terminal 5 or the mirror server 7 is the receiving side or the transmitting side, respectively. That is, in the embodiment of FIG. 1, the mirror server 7 is the receiving side from the relationship with the server 2, but from the relationship with the receiving terminal 5,
Be the sender.

In the service interface layer, a directory service, that is, an event in this embodiment is defined. In the object database layer, an object database, that is, an object in this embodiment, is defined.

Under the above hierarchical model, as shown in FIG. 3, in the object access layer, the object provided by the transmitting side is used by the receiving side.

When the object provided by the transmitting side is updated in the object database layer, the transmitting side generates a subject for reflecting the updated content on the object before the updating, and according to the predetermined transmission schedule. , Delivered to the recipient.
On the other hand, in this case, an event for acquiring the subject generated in the object database layer is generated in the service interface layer, and is also delivered to the reception side according to a predetermined transmission schedule.

On the receiving side, the event transmitted at the service interface layer is received. When the receiving side receives a plurality of events for one subject (when there are a plurality of acquisition methods for acquiring one subject, a plurality of events that describe the plurality of acquisition methods), one of the One is selected. Further, on the receiving side, the subject delivered in the object database layer is acquired according to the received event. Then, on the receiving side, the object is updated based on the subject, so that the same object as the updated object stored on the transmitting side (a copy of the updated object) is stored on the receiving side. Will be.

In order to distribute and acquire the subject in the object database layer, the subject is transmitted from the transmitting side to the receiving side via the broadcast network 4, and also from the receiving side to the communication network 6. This includes cases where the sender is accessed and the subject is acquired.

Next, in updating the object, as described above, when the object is changed (for example, when the weather forecast is considered, the topographic map forming the weather map is changed even if the time or date changes). , Generally, it can be used as it is, but it is necessary to change the isobar representing the atmospheric pressure distribution, the mark indicating the weather, the number indicating the probability of precipitation, etc. In addition to changing the object), a case where the object is newly created and a case where the object is deleted are also included.

By the way, the new generation of an object is
You can think of an object that does not exist as a newly created object, and deleting an object replaces an object that previously existed.
Since it can be considered that the object is changed to a nonexistent object, the new generation of the object, the change of the object, and the deletion of the object can all be regarded as the change of the object.

Therefore, in the data distribution system of FIG.
In any of the cases where a new generation of an object, a change of an object, and a deletion of an object occur, the processing is performed as if the object is changed.

First, the processing when an object is newly generated will be described with reference to FIGS.
Here, it is assumed that data is distributed from the server 2 to the three receiving terminals 5 _{1 to} 5 ₃ .

For example, as shown in FIG. 4, when a new object ObjectA which is not stored in the receiving terminals 5 _{1 to} 5 ₃ is generated in the server 2 (for example, in FIG.
In the above, when the information provider provides new information that is not registered in the database 3), the subject Su that describes the reflection method for reflecting the changed content of the new object ObjectA in the nonexistent object.
bjectA is generated. Here, as the description of the reflection method for reflecting the changed contents of the new object ObjectA to the nonexistent object, for example, an execution format program that generates the object ObjectA when executed, or the object ObjectA itself There is a description.

In the server 2, after the subject SubjectA is generated, an event describing the acquisition method for acquiring the subject SubjectA is generated.

That is, in the embodiment of FIG. 4, three acquisition methods are prepared as the acquisition method of the subject SubjectA, and the events EventA1, EventA2, and EventA3 are generated for each of the three acquisition methods.

These three events EventA1 to EventA3
Is transmitted from the server 2 to the receiving terminals 5 _{1 to} 5 ₃ via the broadcast network 4 capable of simultaneous broadcasting, as shown in FIG. Here, for example, there are cases where all of the three events EventA1 to EventA3 cannot be normally received by the receiving terminals 5 _{1 to} 5 ₃ due to the line state of the broadcasting network 4 and the like (for example, If there is an error during transmission and normal data cannot be received, or the transmission was successful, but the receiving side may fail to receive and normal data may not be received). Figure 5
In the embodiment of the present invention, the reception terminal 5 ₃ has three event Eve.
Although all of ntA1 to EventA3 could be received normally, the receiving terminal 5 ₁ receives only the events EventA1 and EventA2, and the receiving terminal 5 ₂ receives the event EventA1.
Only Event A3 and Event A3 are successfully received.

When the receiving terminals 5 _{1 to} 5 ₃ receive a plurality of events for one subject, one of them is selected, as shown in FIG. That is, in the embodiment of FIG. 6, the receiving terminal 5 ₁ selects, for example, the event EventA1 of the events EventA1 or EventA2 that can be normally received, and the receiving terminal 5 ₂ receives normally. Event created EventA1 or EventA3
For example, the event EventA1 is selected. Further, the receiving terminal _3, of the event EventA1 to EventA3 could be normally received, for example, an event EventA3 is selected.

Then, in the receiving terminals 5 _{1 to} 5 ₃ , as shown in FIG. 7, the subject SubjectA is acquired based on the selected event. That is, in the event EventA1, as a method of obtaining the subject SubjectA, for example, when the time and channel at which the subject SubjectA is transmitted via the broadcast network 4 are described, the receiving terminal 5 ₁ that selects the event EventA1 in and 5 _2, the time described in the event EventA1,
Similarly, the subject SubjectA broadcast from the server 2 is received on the channel described therein.
Also, in the event EventA3, the subject Subject
As a method of obtaining A, for example, when a URL associated with the subject SubjectA is described,
At the receiving terminal 5 _{3 that} has selected the event Event A3, the event
Based on the URL described in EventA3, for example, the server 2 is accessed via the communication network 6, and the subject SubjectA managed there is acquired.

After that, the subject is processed as described above.
In the receiving terminals 5 _{1 to} 5 ₃ which have acquired SubjectA, as shown in FIG. 8, an object ObjectA is generated based on the subject SubjectA. That is, for example, when the subject SubjectA is a program of an execution format for generating the object ObjectA, the program is executed and a new object ObjectA is generated. Further, for example, when the subject SubjectA is the object ObjectA itself, the subject SubjectA is directly used as the object ObjectA.

Next, the processing when the object is changed will be described with reference to FIGS. In this case, too, it is assumed that data is distributed from the server 2 to the three receiving terminals 5 _{1 to} 5 ₃ .

For example, as shown in FIG. 9, in the server 2, when the object ObjectAa stored in the server 2 and the receiving terminals 5 _{1 to} 5 ₃ is changed to the object ObjectAb (for example, in FIG. When information provided by changing the information registered in the database 3 is provided by the provider), a subject SubjectA describing a reflection method for reflecting the changed content of the object ObjectAb is generated in the object ObjectAa. Here, as the description of the reflection method for reflecting the changes to the object ObjectAb in the object ObjectAa, for example, an executable program that changes the object ObjectAa to the object ObjectAb when executed, and the object ObjectAa and ObjectAb There are differences between them.

In the server 2, after the subject SubjectA is generated, an event describing the acquisition method for acquiring the subject SubjectA is generated.

That is, also in the embodiment of FIG. 9, as in the case of the embodiment of FIG. 4, three acquisition methods are prepared as the acquisition method of the subject SubjectA, and for each of the three acquisition methods, Event EventA
1, EventA2, EventA3 are generated.

These three events EventA1 to EventA3
As shown in FIG. 10, the receiving terminals 5 _{1 to} 5 ₃ are transmitted from the server 2 via the broadcast network 4 capable of simultaneous broadcasting.
Sent to. Here, also in the embodiment of FIG. 10, as in the case of the embodiment of FIG. 5, the receiving terminal 5 ₁
Then, only the events EventA1 and EventA2 are normally received at the receiving terminal 5 ₂ , only the events EventA1 and EventA3 are being received at the receiving terminal 5 ₂ , and all three events EventA1 to EventA3 are normally received at the receiving terminal 5 ₃ .

At the receiving terminals 5 _{1 to} 5 ₃ , the subject Su
When multiple events are received for bjectA, Fig. 6
Similar to the case described in 1., one of them is selected, and further, the subject SubjectA is acquired based on the selected event. That is, for example, as in the case of FIG. 6, the event Ev is received at the receiving terminals 5 ₁ and 5 _2.
entA1 is selected, the receiving terminal ₃ in the event EventA3 is selected. Also, at event EventA1,
As a method of obtaining the subject SubjectA, for example, the time and channel at which the subject SubjectA is transmitted via the broadcast network 4 are described, and the event Even
In tA3, for example, a URL associated with the subject SubjectA is described as a method of obtaining the subject SubjectA.

In this case, as shown in FIG.
At the receiving terminals 5 ₁ and 5 ₂ that have selected EventA1, the subject SubjectA broadcast from the server 2 is received at the time described in the event EventA1 on the channel described therein. Also, the event Ev
In the receiving terminal 5 ₃ you select EntA3, based on the URL described in the event EventA3, via the communication network 6, for example, access is made to the server 2, where-Managed subject SubjectA is obtained.

After that, in the receiving terminals 5 _{1 to} 5 ₃ which have acquired the subject SubjectA, as shown in FIG. 12, based on the subject SubjectA, the object ObjectAa
Is changed to the object ObjectAb. That is, for example, when the subject SubjectA is a program of an execution format for changing the object ObjectAa to the object ObjectAb, the program is executed and the object ObjectAa is changed to the object ObjectAb. Further, for example, when the subject SubjectA is the difference between the objects ObjectAa and ObjectAb, the difference is added to the object ObjectAa, so that the object ObjectAa is changed to the object ObjectAb.

Next, for example, when the object ObjectAb changed and stored in the server 2 and the receiving terminals 5 _{1 to} 5 ₃ as described above is deleted in the server 2 (for example, in FIG. 1, When the information provider provides the information indicating that the information registered in the database 3 has been deleted), the subject that describes the reflection method for reflecting the change contents to the nonexistent object in the object ObjectAb. SubjectA is generated.
Here, as the description of the reflection method for reflecting the change content to the non-existent object in the object ObjectAb, for example, an execution-type program that deletes the object ObjectAb when executed, or the receiving terminals 5 _{1 to} 5 ₃ On the other hand, there is a command for instructing the deletion of the object ObjectAb.

In the server 2, after generating the subject SubjectA, an event describing the acquisition method for acquiring the subject SubjectA is generated.

Then, in the same manner as described with reference to FIG. 4 to FIG. 8 or FIG. 9 to 12, the server 2 transmits the event, and, if necessary, the receiving terminals 5 _{1 to} 5 _In each of the _three , the event is selected and the subject SubjectA is acquired.

After that, in the receiving terminals 5 _{1 to} 5 ₃ which have acquired the subject SubjectA, the object ObjectAb is deleted based on the subject SubjectA. That is,
For example, the subject SubjectA is the object Object
If it is an executable program for deleting Ab, the program is executed and the object ObjectAb
Is deleted. Also, for example, SubjectA
Is a command to delete the object ObjectAb, the receiving terminals 5 _{1 to} 5 ₃ delete the object ObjectAb according to the command.

Next, FIG. 13 shows a configuration example of the server 2 of FIG.

The communication control unit 11 is, for example, a modem or a T
It is composed of A (Terminal Adapter) and controls the communication via the communication network 6.
The scheduler 12 is adapted to perform scheduling for transmission of data via the broadcast network 4. That is, the scheduler 12
The event generation unit 13 receives notification of subject generation, and performs scheduling for transmitting the subject. Further, the scheduler 12 informs the subject / event generation unit 13 of the transmission schedule of the subject, that is, the transmission time, the transmission channel, the data rate, and the like. In response to this, the subject / event generation unit 13 generates an event in which the transmission time and transmission channel of the subject from the scheduler 12 are described, and notifies the scheduler 12 that the event has been generated. The scheduler 12 receives the notification of the event generation and performs scheduling for transmitting the event. The transmission schedule of the event and the subject is supplied from the scheduler 12 to the data configuration unit 17.

In the present embodiment, for example,
The transmission channel of the event is determined in advance. Therefore, the scheduler 12 determines, for example, the broadcast time and the data rate of the event, excluding the transmission channel.

When the subject / event generation unit 13 receives from the registration unit 15 that the object registered in the database 3 has been updated, the subject for reflecting the updated content and the subject are reflected. Generate event and event to get, storage 1
It is designed to be supplied to four. The storage 14 is
The subject / event supplied from the subject / event generation unit 13 is stored.

In the registration unit 15, updated objects (as described above, changed objects, newly created objects, deleted objects, etc.) are read from the databases 1a to 1c of the information providers A to C. (Including (information of)) is delivered, and the registration unit 15 updates the registered content of the database 3 corresponding to the object (the object after the change is changed to the object before the change). In addition to the case of registering in exchange, the case of registering a new object and the case of deleting an object are also included). Further, when the registration content of the database 3 is updated, the registration unit 15 also notifies the subject / event generation unit 13 to that effect.

The subject search unit 16 receives from the communication control unit 11 the request for the subject transmitted from the receiving terminal 5 via the communication network 6, searches for the subject, and supplies the subject to the communication control unit 11. It is done like this. The data configuration unit 17 reads events and subjects from the storage 14 according to the transmission schedule from the scheduler 12, and
The transmission unit 18 forms transmission data to be transmitted via the broadcast network 4 and supplies the transmission data to the transmission unit 18. The transmission unit 18 is configured to transmit (transmit) the transmission data from the data configuration unit 17 via the broadcast network 4.

In the server 2 configured as described above, a registration process for registering data in the database 3 (updating the registration contents of the database), a subject / event generation process for generating a subject and an event, and a broadcast network 4 are used. A data transmission process for transmitting an event or a subject, and a request subject transmission process for transmitting the subject through the communication network 6 when the receiving terminal 5 requests the subject through the communication network 6 are performed. Has been done.

That is, in the registration process, as shown in the flow chart of FIG. 14, first, in step S1, the databases 1a to 1 of the information providers A to C are first provided.
It is determined by the registration unit 15 whether or not the object has been delivered from any one of c, and if it is determined that the object has not been delivered, the process returns to step S1. If it is determined in step S1 that the object has been delivered, the process proceeds to step S2 and the registration unit 1
5 adds an identifier to the object, for example.

Here, the identifier is used to identify the object, and is, for example, uniquely assigned in advance for each of traffic information, weather information, stock price information, and constituent elements that make up such information. ID
(Identification), and version information indicating the freshness of the object. As the version information, for example, an integer value that is incremented by 1 each time the object is updated is used, and therefore, for objects to which the same ID is added, the version information is compared. By doing so, the latest object can be recognized.

Here, the ID and version information are both fixed length, for example. Also, ID
Information necessary to obtain an identifier including the version information and the version information is distributed together with the object from the databases 1a to 1c, for example. Therefore, in the registration unit 15, the databases 1a to 1
From c, the identifier of the object is generated based on the information distributed with the object.

The registration unit 15 includes databases 1a to 1c.
When an identifier including an ID and version information is added to the object distributed from
3, the object to which the same ID as the ID is added is searched from the database 3 and supplied to the subject / event generation unit 13. That is, the objects distributed from the databases 1a to 1c are basically the objects updated in the database 3, and therefore, in step S3,
The pre-update object registered in the database 3 and the post-update object distributed from the databases 1a to 1c are subject / subject from the registration unit 15.
It is supplied to the event generation unit 13.

If the object distributed from the databases 1a to 1c is newly generated, that is, if the object having the same ID as that object is not registered in the database 3, Nothing is supplied from the registration unit 15 to the subject / event generation unit 13 as an object before updating (a new object distributed from the databases 1a to 1c is supplied as an object after updating). . Further, when the distribution contents from the databases 1a to 1c are for requesting the deletion of the object registered in the database 3, the registration unit 15 notifies the subject / event generation unit 13 of the updated contents. Nothing is supplied as an object (as an object before update, registered in the database 3,
The object to be deleted is supplied).

Thereafter, the registration unit 15 causes the database 3
The updated object distributed from the databases 1a to 1c is registered in place of the object before update registered in (1), and the process returns to step S1.

Next, in step S3 described above, when the object before update and the object after update are supplied from the registration unit 15 to the subject / event generation unit 13, the subject / event generation unit 13 subjects and events. Subject / event generation processing for generating is performed.

That is, the subject / event generator 13
Upon receiving the object before update and the object after update, the subject for creating the object after update is generated by reflecting the update content of the object on the object before update. Here, FIG.
5 (A) shows the format of the subject. As described above, the subject includes the method of updating the object before update to the object after update, and also includes the identifiers of the object before update and the object after update that are updated by the subject.

After generating the subject, the subject / event generation unit 13 determines the method of acquiring the subject and performs the necessary processing. That is, the subject
When it is acquired via the broadcast network 4, the subject / event generation unit 13 uses the scheduler 12
, The subject data amount and other necessary information are supplied to schedule the transmission. Further, when the subject is acquired via the communication network 6, the subject / event generation unit 13 causes the subject to display information (access path) indicating the position of the subject on the communication network 6 such as a URL.
Correspond to. Then, the subject / event generation unit 13 supplies the subject to the storage 14 and stores the subject therein.

After that, the subject / event generation unit 1
In No. 3, an event for generating the generated subject is generated. That is, the subject / event generation unit 1
In item 3, for example, as described above, when the scheduler 12 is made to set the transmission schedule of the subject, an event describing the transmission schedule (broadcast time, broadcast channel, data rate, etc.) is generated. . Furthermore, in the subject / event generation unit 13,
For example, as described above, when a URL is associated with a subject and stored in the storage 14, the U
An event describing the RL is generated. This event is also supplied to and stored in the storage 14 similarly to the subject.

Here, FIG. 15B shows the format of the event. As described above, in the event, obtain (acquire) the subject that describes the method of updating the object before update to the object after update.
In addition to the above, the subject includes the identifiers of the object before update and the object after update, which are updated by the subject, and the type of update (change of object, new generation, deletion, etc.).

In the embodiment shown in FIG. 15, the identifier of the object before update is NULL when the object is newly generated, and the identifier of the object after update when the object is deleted. Is NUL
It is designed to be changed to L respectively.

Next, the data transmission process will be described with reference to the flowchart of FIG.

In the data transmission process, first, in step S11, the data composition unit 17 reads out the event or subject to be transmitted from the storage 14 according to the transmission schedule of the scheduler 12. Then, in step S12, the data configuration unit 17 sets the event or subject read from the storage 14 as transmission data in a predetermined format,
It is supplied to the transmission unit 18. The transmission unit 18 performs step S13.
In, the transmission data from the data configuration unit 17 is transmitted via the broadcast network 4, and the process proceeds to step S14. In step S14, the transmission unit 18 determines whether or not a predetermined time has elapsed from the timing at which the transmission of the transmission data from the data configuration unit 17 was first performed. S1
Returning to 3, the transmission of the transmission data is repeated. That is, since the data transmission by the broadcast network 4 is performed only in one direction from the server 2 to the receiving terminal 5, it is not possible to confirm whether or not the data transmission / reception is accurately performed between them. Therefore, in the server 2, the transmission of the transmission data is repeated for a predetermined time (or a predetermined number of times), so that the receiving terminal 5 can improve the probability that the correct data is received. Has been done.

On the other hand, in step S14, when it is determined that the predetermined time has passed from the timing when the transmission of the transmission data from the data forming unit 17 is first performed, the process returns to step S11, and the same processing is performed thereafter. Repeated.

Next, the request subject transmission processing in the server 2 will be described with reference to the flowchart in FIG.

In this case, in step S21, the communication control unit 11 determines whether or not the URL is transmitted from the receiving terminal 5 via the communication network 6, and if it is determined that the URL is not transmitted, Return to S21. In step S21, the URL
Is determined to have been transmitted, the communication control unit 11
Transfers the URL to the subject search unit 16. When the subject search unit 16 receives the URL,
In step S22, the subject associated with the URL is searched from the storage 14,
It is supplied to the communication control unit 11. The communication control unit 11 receives the subject from the data search unit 16, and executes step S2.
In 3, the information is transmitted to the receiving terminal (here, for example, the receiving terminal 5) that has transmitted the URL via the communication network 6, and the process returns to step S21.

Next, FIG. 18 shows a configuration example of the receiving terminal 5 of FIG.

The receiving unit 21 receives the transmission data transmitted from the server 2 via the broadcast network 4, decodes it into an event or a subject, and selects the selection unit 22.
It is designed to be output to. The selection unit 22 is configured to select an event or subject from the reception unit 21 and supply the selected event or subject to the storage 23. Storage 23
Is composed of, for example, a large-capacity hard disk, a magneto-optical disk, or another recording medium, and stores (records) the event or the subject from the selection unit 22.

The subject processing unit 24 uses the storage 2
3, the subject is read out, and the object stored in the database 25 is updated based on the subject. Note that the subject processing unit 24 may be supplied with the subject from the communication control unit 31, and even when the subject processing unit 24 receives the subject from the communication control unit 31, the subject processing unit 24 uses the database 25 based on the subject. It is designed to update the objects stored in.

The database 25 is adapted to store objects. The reading unit 26 is the operation unit 2
In response to the operation of 8, the object stored in the database 25 is read and supplied to the output unit 27. The output unit 27 includes, for example, a display and a speaker, and is configured to display the object from the reading unit 26 or output as an audio. The operation unit 28 is operated when displaying and outputting the data registered in the database 23 on the output unit 25.

The event selecting section 29 reads out the event stored in the storage 23 and supplies it to the event processing section 30. In addition, the event selection unit 2
When a plurality of events for acquiring the same subject are stored in the storage 23, 9 selects one of the plurality of events and supplies it to the event processing unit 30. There is.

The event processing section 30 includes the event selection section 2
The subject is acquired based on the event supplied from 9. That is, the event processing unit 3
In the case of 0, the broadcast channel and broadcast time of the subject are described in the event. Therefore, when the subject is transmitted via the broadcast network 4, the reception unit 21 and the selection unit 22 should be controlled. Causes the subject to be received and selected. Further, the event processing unit 30 describes the URL associated with the subject in the event. Therefore, the subject makes a request to the server 2 or the like via the communication network 6, When it is transmitted, the communication control unit 31 is controlled to request and receive the subject.

The communication control unit 31 is adapted to perform communication control via the communication network 6, whereby under the control of the event processing unit 30, a request for a subject is sent via the communication network 6 to a server. Server 2 or in response to the request, the server 2
The subject is transmitted from the communication network 6 via the communication network 6 and is supplied to the subject processing unit 24.

In the receiving terminal 5 configured as above,
Reception processing related to reception of transmission data transmitted from the server 2 via the broadcast network 4, event-related processing for processing an event received in the reception processing, and the like are performed.

First, the reception process will be described with reference to the flowchart in FIG.

When the transmission data is transmitted from the server 2 via the broadcast network 4, the receiving unit 21 receives the transmission data in step S31, decodes it into an event or a subject, and then sends it to the selecting unit 22. Supplied. In step S32, the selection unit 22 determines whether the data (here, event or subject) from the reception unit 21 is to be selected.

In other words, if all the events and subjects transmitted from the server 2 via the broadcast network 4 are received and stored, the storage 23,
As a result, the database 25 requires an enormous storage capacity. Also, the users have preferences, and each user rarely needs all of the objects stored in the server 2 database. Nevertheless, it is not preferable to register all the registered contents of the database 3 of the server 2 in the database 25 from the viewpoint of efficient storage of data.

Therefore, for example, when the ID of the object desired by the user is registered in the selection unit 22, the ID is described in the selection unit 22 as the ID of the object before or after the update. Only the event and the subject are selected and supplied to the storage 23 for storage. Therefore, step S
The determination in 32 is performed by comparing the ID registered by the user with the ID described in the event or the subject supplied from the reception unit 21.

When it is determined in step S32 that the transmission data from the receiving unit 21 should not be selected, that is, for example, the ID registered by the user and the receiving unit 2 are selected.
When the event or the ID described in the subject supplied from 1 does not match, the next transmission data is
After waiting for transmission via the broadcasting network 4, the process returns to step S31. Therefore, in this case, the event or subject from the receiving unit 21 is not registered in the storage 23.

On the other hand, in step S32, the receiving unit 2
When it is determined that the event or subject from 1 is to be selected, that is, when the ID registered by the user and the ID described in the event or subject supplied from the receiving unit 21 match. ,
In step S33, the selection unit 22 determines whether an event or subject in which the same ID as the ID in the event or subject is described is stored in the storage 23.

If it is determined in step S33 that the event or subject having the same ID as the ID described in the event or subject from the receiving unit 21 is not stored in the storage 23, step S34 Skip to step S35
Then, the event or subject from the receiving unit 21 is registered in the storage 23, and the process returns to step S31.

In step S33, the receiving unit 2
When it is determined that the event or subject in which the same ID as that described in the event or subject from 1 is described in the storage 23 is stored in the storage 23, the process proceeds to step S34 and the selection unit 22 The same version information as the version information described in the already stored event or subject (hereinafter, appropriately referred to as registered data) is received by the receiving unit 2.
It is determined whether the event or subject from 1 is described.

In step S34, when it is determined that the same version information as the version information described in the registered data is described in the event or subject from the receiving unit 21, that is, in FIG.
As described in the data transmission processing of No. 2, the same event and subject are repeatedly transmitted from the server 2 via the broadcast network 4 in order to improve reliability. , Events and subjects due to past transmissions have already been
If it is registered in the storage 23, step S31
Return to. Therefore, in this case, the event or subject from the receiving unit 21 is not registered in the storage 23 (since it is already registered, there is no need to register it again).

On the other hand, if it is determined in step S34 that the same version information as the version information described in the registered data is not described in the event or subject from the receiving unit 21, step S3
5, the event or subject from the receiving unit 21 is registered in the storage 23, and the process returns to step S31.

That is, when the version information described in the registered data and the version information described in the event or subject from the receiving unit 21 are different, the registered data is the event from the receiving unit 21 or Since the subject has been received and stored in the past in order to update the version of the object that is older than the object to be updated, the event or subject from the receiving unit 21 overwrites the registered data, for example. Is written in the storage 23 in the form of

As described above, when the subject is stored in the storage 23, the subject processing unit 24
Reads the subject from the storage 23 and updates the object registered in the database 25 based on the subject. The updated object is then operated by operating the operation unit 28.
The reading unit 26 reads the data from the database 25, supplies the data to the output unit 27, and outputs the data.

After updating the object, the subject processing unit 24
The subject used for the update is erased from the storage 23.

Next, the event-related processing will be described with reference to the flowchart in FIG.

In the event selecting section 29, step S41
In the above, for example, only one event stored in the storage 23 is read, the process proceeds to step S42, and the event having the same ID as the ID described in the event (FIG. 15B) is described. However, it is also determined whether or not it is stored in the storage 23. When it is determined in step S42 that the event having the same ID as the ID described in the event read in step S41 is not stored in the storage 23, that is, read in step S41. When only one event in which the ID described in the generated event is described is stored in the storage 23, the event read in step S41 is changed from the event selecting unit 29 to the event processing unit 30. To step S44, skipping step S43.
Proceed to.

On the other hand, in step S42, the event having the same ID as the ID described in the event read in step S41 is stored in the storage 2
3 is determined, that is, when a plurality of events in which the ID described in the event read in step S41 is described are stored in the storage 23, the event selection unit In 29, all the events in which the same ID is described are read from the storage 23, and the process proceeds to step S43.

At step S43, the event selection section 29
, The same I read from the storage 23
One of the plurality of events in which D is described is selected. That is, the event selection unit 29, for example, evaluates the subject acquisition method described in a plurality of events, and selects one from the plurality of events based on the evaluation result.

Specifically, for example, in the case where the time at which the subject is transmitted via the broadcast network 4 is described in each of a plurality of events,
For example, when the object updated by that subject is needed by the application that is currently executing, the event with the earliest time described is selected. Further, for example, when the subject describes the data rate transmitted via the broadcast network 4 for each of the plurality of events, the fastest data rate that the receiving terminal 5 can support is described. The event is selected. Further, for example, the time and channel at which the subject is transmitted via the broadcast network 4 is described in one of the plurality of events, and the subject is described in the other one.
When the URL for requesting via the communication network 6 is described and the line condition of the broadcasting network 4 is poor (for example, S / N (Signal / Noise))
Is low), the event in which the URL is described is selected.

The event selected in step S43 is output from the event selecting section 29 to the event processing section 30, and the process proceeds to step S44.

At step S44, the event processing unit 30
In, the subject is acquired according to the event supplied from the event selection unit 29. That is, for example, when the event from the event selecting unit 29 describes the transmission time and the transmission channel at which the subject is transmitted via the broadcast network 4, the event processing unit 30, at the broadcast time, The receiving unit 21 and the selecting unit 22 are controlled so that the subject transmitted from the transmission channel is received and selected. This allows
Based on the event output from the event selecting unit 29 to the event processing unit 30, the receiving unit 21 and the selecting unit 22 receive and select the subject, and the subject is supplied and stored in the storage 23. After that, the subject processing unit 24 updates the objects stored in the database 25 as described above.

When the power of the receiving terminal 5 is off, the event processing section 30 turns on the power of the receiving terminal 5 at the transmission time described in the event output by the event selecting section 29. It also turns on.

Further, for example, the event processing section 30 adds the subject to the event from the event selecting section 29.
When the URL for requesting via the communication network 6 is described, the communication control unit 31 is controlled and the UR
By sending L to the server 2 or the like via the communication network 6, the subject is requested. In this case, the server 2 performs the request subject transmission process described in FIG. 17, and the subject is transmitted via the communication network 6. The subject is received by the communication control unit 31 and supplied to the subject processing unit 24. In this case, the subject processing unit 24 uses the database 25 based on the subject from the communication control unit 31.
The objects stored in are updated.

After the above processing, from the viewpoint of effective utilization of the storage 23, the event read from the storage 23 is erased, the process returns to step S41, and the same processing is repeated thereafter.

The data distribution system as described above, for example, distributes data to a large number of databases in a distributed database, distributes data by IP multicast, and otherwise unspecified large number of data. Especially useful when delivering.

Further, in the present embodiment, the event is transmitted via the broadcast network 4. However, in addition to this, the event may be transmitted via the communication network 6 in response to a request from the receiving terminal 5. You can Further, in the present invention, it is not essential to have both the broadcast network 4 and the communication network 6. That is, the present invention can be applied to a system including only one of the broadcast network 4 and the communication network 6.

[0149]

As above, according to the present invention, Rukoto according to a transmitting apparatus and transmission method of the present invention, the receiving side, the broadcast data, knowledge that the content has been updated racemate, by reflecting the data, to update the content Is possible.

[0150] According to the receiving apparatus and receiving method of the present invention, the notification data, to know that the content has been updated, it is possible by reflecting the data, to update the content.

Further, according to the transmission / reception system and the transmission / reception method of the present invention, it is possible to know that the content has been updated by the notification data and update the content with the reflection data.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an embodiment of a data distribution system to which the present invention has been applied.

FIG. 2 is a diagram for explaining a data transmission / reception protocol in the data distribution system of FIG.

FIG. 3 is a diagram for explaining a data transmission / reception protocol in the data distribution system of FIG.

FIG. 4 is a diagram for explaining a process of the data distribution system of FIG.

5 is a diagram for explaining a process of the data distribution system of FIG.

FIG. 6 is a diagram for explaining the processing of the data distribution system of FIG.

FIG. 7 is a diagram for explaining the process of the data distribution system of FIG.

FIG. 8 is a diagram for explaining the process of the data distribution system of FIG.

9 is a diagram for explaining the process of the data distribution system of FIG.

FIG. 10 is a diagram for explaining the process of the data distribution system of FIG.

FIG. 11 is a diagram for explaining the processing of the data distribution system of FIG.

12 is a diagram for explaining the process of the data distribution system of FIG.

FIG. 13 is a block diagram showing a configuration example of a server 2 in FIG.

FIG. 14 is a flowchart illustrating a registration process performed by the server 2.

FIG. 15 is a diagram showing formats of a subject and an event.

FIG. 16 is a flowchart illustrating a data transmission process performed by the server 2.

FIG. 17 is a flowchart illustrating a request subject transmission process performed by the server 2.

18 is a block diagram showing a configuration example of a receiving terminal 5 in FIG.

FIG. 19 is a flowchart illustrating a receiving process performed by the receiving terminal 5.

20 is a flowchart for explaining event-related processing performed by the receiving terminal 5. FIG.

[Explanation of symbols]

1a to 1c database, 2 server, 3 database, 4 broadcasting network, 5 receiving terminal, 6 communication network, 7 mirror server,
11 communication control unit, 12 scheduler, 13 subject / event generation unit, 14 storage,
15 registration section, 16 subject search section, 17
Data structure part, 18 transmission part, 21 reception part, 2
2 selection unit, 23 storage, 24 subject processing unit, 25 database, 26 reading unit,
27 output unit, 28 operation unit, 29 event selection unit, 30 event processing unit, 31 communication control unit

Front page continued (72) Inventor Kazuo Haraoka 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Yasuaki Yamagishi 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony (56) References JP 10-303983 (JP, A) JP 9-81447 (JP, A) JP 10-22950 (JP, A) JP 8-37506 (JP, A) JP-A-11-219330 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 12/18 G06F 12/00 545 G06F 13/00 540 H04H 1/00

Claims (16)

(57) [Claims] 1. A transmission device for transmitting data for providing content registered in a database, wherein when the content registered in the database is updated, the updated content is the content before update. Including the description of the reflection method to be reflected in the
To reflect the content before the update based on the law
All that and reflect data generation means for generating a reflection data, is content that has been registered in the database has been updated
And the above for reflecting the updated contents of the contents
A transmitting apparatus comprising: a notification data generating unit that generates notification data including a description of a method of acquiring the reflection data; and a transmitting unit that transmits the reflection data and the notification data via a predetermined transmission path. 2. The transmission device according to claim 1, wherein the reflection data generation unit generates one or more pieces of the reflection data in response to content update. Wherein said transmission means, so as to be able to acquire the reflected data by the acquisition method described in the notification data, according to claim 1, wherein the transmitting the reflected data Transmitter. 4. The transmission means transmits the reflection data via a broadcast network capable of simultaneous broadcast or a bidirectional network capable of bidirectional communication. Transmitter. 5. The notification data generation means, when there are a plurality of acquisition methods of the reflection data, generates a plurality of the notification data including respective descriptions of the plurality of acquisition methods. 1. The transmission device according to 1 . 6. The transmitter according to claim 1, wherein the transmitter transmits the broadcast data via a broadcast network capable of simultaneous broadcast or a bidirectional network capable of bidirectional communication. Transmitter. 7. A method of transmitting data for providing content registered in a database, wherein when the content registered in the database is updated, the updated content is reflected on the content before the update. How to reflect the update contents including the description of the reflection method
To reflect the content before the update based on the law
Generate the reflection data of the above, and reflect that the content has been updated and the update content of the content.
A transmission method comprising generating broadcast data including a description of the method of acquiring the reflection data for the purpose of transmitting the reflection data and the broadcast data via a predetermined transmission path. 8. A receiving device for receiving data for receiving provision of content registered in a database, for reflecting the fact that the content registered in the database has been updated and the updated content of the content. of
Notification data receiving means for receiving notification data including a description of a method for acquiring reflected data; and an anti- reflection means for reflecting the update content of the content notified of by the notification data based on the notification data.
A receiving apparatus comprising: a reflection data receiving unit that receives the reflection data including a description of a projection method; and an updating unit that updates the content based on the reflection data. Wherein said reflected data receiving means, based on the method of obtaining the reflection data included in the notification data,
The receiving device according to claim 8 , wherein the reflection data is received. 10. When the notification data receiving means receives a plurality of the notification data including respective descriptions of a plurality of acquisition methods of the reflection data, one of the plurality of the notification data is selected. The reflection data receiving means acquires the reflection data based on an acquisition method of the reflection data included in the notification data selected by the selection means. 8. The receiver according to item 8 . 11. The selection means evaluates a method of acquiring the reflection data included in a plurality of the notification data, and selects one of the notification data based on the evaluation result. 10. The receiving device according to 10 . 12. the notification data reception means, according to claim, characterized in that the notification data is received via a bidirectional network capable broadcast network or bidirectional communication capable broadcast 8 The receiving device according to 1. Wherein said reflected data receiving means, claim, characterized in that the reflection data are received via a bidirectional network capable broadcast network or bidirectional communication capable broadcast 8 The receiving device according to 1. 14. A method of receiving data for receiving provision of content registered in a database, the method comprising: reflecting that content registered in the database has been updated and the updated content of the content.
Receives the broadcast data containing a description of the method for acquiring the reflected data, based on the notification data, it is updated by the broadcast data to reflect the update content of the content that is broadcast anti
A receiving method comprising: receiving the reflection data including a description of a projection method, and updating the content based on the reflection data. 15. A transmission / reception system comprising: a transmission device that transmits data for providing content registered in a database; and a reception device that receives data from the transmission device, wherein the transmission device comprises: If the content registered in the database is updated, the updated contents, including a description of how reflected to be reflected in the contents before update, the update contents prior Symbol reflecting side
To reflect the content before the update based on the law
Of the reflected data generation method and that the content registered in the database has been updated .
And the above for reflecting the updated contents of the contents
Notification data generation means for generating notification data including a description of the acquisition method of the reflection data, and the transmission means for transmitting the reflection data and notification data via a predetermined transmission path, the receiving device, Notification data receiving means for receiving notification data; and an anti- reflective means for reflecting the update content of the content notified of the update by the notification data based on the notification data.
A transmission / reception system, comprising: reflection data receiving means for receiving the reflection data including a description of a projection method; and updating means for updating the content based on the reflection data. 16. A transmission / reception method of a transmission / reception system, comprising: a transmission device that transmits data for providing contents registered in a database; and a reception device that receives data from the transmission device. In the device, when the content registered in the database is updated, the update content includes a description of a reflection method for reflecting the update content on the content before update,
To reflect the content before the update based on the law
Generate the reflection data of the above, and reflect that the content has been updated and the update content of the content.
For generating notification data including a description of the method of acquiring the reflection data for transmitting the reflection data and the notification data via a predetermined transmission path, the receiving device, receiving the notification data, based on the notification data, it is updated by the broadcast data to reflect the update content of the content that is broadcast anti
A transmission / reception method, comprising: receiving the reflection data including a description of a projection method, and updating the content based on the reflection data.