Method and devices for broadcasting cellular service information

Abstract: The present invention provides a digital data transmitting/receiving method, a base station unit, and a mobile object terminal unit, which enable to collect information desired by the mobile object terminal among service information distributed by the base station by using a broadcasting channel. The base station 10 transmits data after the identification information 32 and 33 is added in the header information 30 of the service information provided to the mobile object terminal 20, and the mobile object terminal 20 has an address showing the identification information 32 and 33 and analyzes the identification information 32 and 33 by indicating the address to identifies whether the service information 40 is provided to the terminal itself.

Description: FIELD OF THE INVENTION The present invention relates to a technology for transmitting/receiving digital data between a base station and a mobile object terminal, and more particularly, to a digital data transmitting/receiving method, a base station unit used for transmitting/receiving digital data, and a mobile object terminal unit used for transmitting/receiving digital data, which enable to collect information desired by the mobile object terminal among service information distributed from the base station. BACKGROUND OF THE INVENTION As a digital data transmitting/receiving technology in the broadcasting by a communication satellite (CS) or a broadcasting satellite (BS) and the ground wave digital broadcasting, service information is distributed from a base station (broadcasting station) to mobile object terminals existing in a service area thereof, by using a prescribed broadcasting channel. In addition, Japanese Published Patent Application No. Hei.7-154350 discloses a multiplex broadcasting method in which multiplex data is broadcast after area codes such as zip codes are attached to the multiplex data on the broadcasting station side to restrict broadcasting target areas of area information such as commercials closely related to areas, an area code of an installation area of a multiplex broadcasting receiver is registered as ID of the receiver in a memory on the receiver side, the area code of the received multiplex data which is separated by a data extracting circuit and ID in the memory are compared with each other, and only when they are judged to coincide with each other, a picture image corresponding to the multiplex data is displayed on an image receiver. However, in the prior art digital data transmitting/receiving method, since the base station distributes various kinds of service information by using a prescribed broadcasting channel, it is difficult for the mobile object terminal which is provided with the service information to collect only information which the mobile object terminal really needs among the various kinds of service information. In the multiplex broadcasting method which restricts the areas, as disclosed in Japanese Published Patent Application No. Hei.7-154350, it is impossible to collect only the information desired by a user, neither. The patent application WO-A-9 524 808 proposes a solution to this problem and discloses a system wherein a base station transmists a message to mobile users comprising geographic coordinates to allow a mobile to receives a payload only when the mobile is located in the area defined by said coordinates. Further, the application WO-A-9 528 810 proposes a base unit transmitting service informations wherein the header of the message comprises identification information of said service. SUMMARY OF THE INVENTION The present invention is made to solve the above-mentioned problem, and an object of the present invention is to provide a digital data transmitting/receiving method, a base station unit used for transmitting/receiving digital data, and a mobile object terminal unit used for transmitting/receiving digital data, which enable to collect information desired by the mobile object terminal among service information distributed by the base station. Thus, the present invention concerns a method for transmitting/receiving digital data between a base station and a mobile object terminal installed on a mobile object existing in a service area, as defined in the appended claims. The present invention also concerns a base station unit used for transmitting/receiving digital data between a base station and a mobile object terminal installed on a mobile object existing in a service area, as defined in the appended claims. The present invention also concerns a mobile object terminal unit used for transmitting/receiving digital data between a base station and the mobile object terminal installed on a mobile object existing in a service area, as defined in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram illustrating structures of a base station unit and a mobile object terminal unit which are used in a digital data transmitting/receiving method according to a first embodiment of the present invention. Figure 2 is a diagram illustrating a data structure used between the base station and the mobile object terminal shown in figure 1. Figure 3 is a diagram illustrating respective identification units of identification information in the data structure shown in figure 2. Figure 4 is a diagram showing contents of the respective identification units shown in figure 3. Figure 5 is a diagram showing an example in which masking processing is performed to part of the identification units shown in figure 3. Figures 6 are diagrams showing contents of permission information in the data structure shown in figure 2. Figure 7 is a flow chart showing a data processing procedure in a data recognition means in the mobile object terminal shown in figure 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment including a digital data transmitting/receiving method, a base station unit, and a mobile object terminal unit according to the present invention will be described. Embodiment 1. In a digital data transmitting/receiving system according to the first embodiment, an address including identification information for receiving services is set on a receiving terminal side. On the other hand, a data base (DB) comprising various kinds of service information such as map data, traffic information, route guide information, area information, news, weather forecast, and electronic mails is held on a base station side. By adding header information constituted by identification information which can specify service target users and permission information which sets availability level of data to the service information, data services can be provided to the particular users. Figure 1 is a block diagram illustrating structures of a base station unit and a mobile object terminal unit, used for transmitting/receiving digital data according to the first embodiment of the present invention. In the figure, reference numeral 10 designates a base station unit (hereinafter referred to simply as a base station) established on the ground, and numeral 20 designates a on-vehicle terminal as a mobile object terminal unit which is installed on a mobile object. The system for realizing the digital data transmitting/receiving method according to the first embodiment is constituted by the base station 10, one or more on-vehicle terminals 20, and one or more fixed terminals comprising terminals established on the ground (not shown) . In addition, as mobile objects, there are a motorcar, a train, a ship, an airplane, etc. , but a motorcar is taken as an example in this first embodiment. The base station 10 is constituted by a service information DB 1, a data generating means 2, and a data transmitting means 3. The service information DB 1 is a data base holding various kinds of service information such as map information, traffic information, area information (such as parking spaces, gas stations (GS), restaurants, neighborhood facilities, and events), general information (such as news and weather forecasts), message information (voice, text), live views (still pictures, moving pictures), internet (electronic mails, news, WWW (World Wide Web)), advertisements, and software. The data generating means 2 extracts the service information having contents to be broadcast from the service information DB 1 and generates data to be transmitted by adding identification information specifying service target users and permission information indicating availability level as header information to the extracted service information. Details of a structure of the data will be described later with reference to figures 2 to 6. The data transmitting means 3 digitally transmits the data to be transmitted which is generated by the data generating means 2 from a transmitting antenna 31 to the on-vehicle terminal 20. Here, a broadcasting unit used in ground wave digital broadcasting, satellite digital broadcasting or the like can be used as a communication means in broadcasting. On the other hand, the on-vehicle terminal 20 is constituted by a data receiving means 4, an operation input means 5, a data recognition means 6, a data storing means 7, and a data output means 8. The data receiving means 4 is a unit for receiving the data transmitted from the base station 10. The operation input means 5 is an input unit which is used for operations of deciding whether a broadcasting service is received or not, or selecting a category of desired data. As the operation input means 5, input units such as voice inputting and a remote controller are used. The data recognition means 6 is constituted by a header information extracting unit 66 and a service target judging unit 67, as shown in figure 1(b). The header information extracting unit 66 extracts header information from the received data which is received by the data receiving means 4. The service target judging unit 67 compares an address assigned to the on-vehicle terminal 20 with the identification information included in the header information which is extracted by the header information extracting unit 66, and judges whether it is the service target data or not, or judges the availability level of the data by checking the permission information, or further judges the contents of the received data by checking the data identification header. The data storing means 7 is a unit for storing data on the basis of the judgement by the data recognition means 6. The data storing means 7 can be constituted by a recording medium such as a flash memory, a hard disk, and an optical disk. Or it may be constituted as an internal memory of the data recognition means 6. The data output means 8 outputs data on the basis of the judgement by the data recognition means 6. The data output means 8 is constituted by a display, a speaker or the like. Next, a data structure used in transmitting/receiving digital data according to the first embodiment will be described. Figures 2 to 6 are diagrams illustrating the data structure. The data structure used in transmitting/receiving digital data according to the first embodiment is constituted by header information 30 and service information 40 as shown in figure 2. In the first embodiment, the header information 30 is constituted by address header information 32 and permission header information 33. The address header information 32 is identification information for specifying the on-vehicle terminal 20 as a service target user. Here, the address header information 32 as the identification information is constituted by a transmission source terminal address 34 and a transmission destination terminal address 35 on a receiving terminal. The transmission source terminal address 34 corresponds to an address of a terminal which provides information to the base station 10, and the transmission destination terminal address 35 corresponds to an address of other terminal specified by the terminal which provides the information to the base station 10, for example. The permission header information 33 is information which sets the availability level of the provided service information in the on-vehicle terminal 20 as the service target user. Here, the availability level means, for example, to permit only to use the provided service information, to permit to store the same in a storing means, or to restrict utilization time limit of the service information. In addition, in the first embodiment, the service information 40 is constituted by a data identification header 42 and data 43. The data identification header 42 shows data recognition information for the data 43. The data recognition information is constituted by such as point information, division information, and partly available information. The point information is information which allows the on-vehicle terminal 20 receiving the services to collect data which is related to an arbitrary point or area among the data 43. More specifically, a code number showing map data, traffic information, route guide information, area information (such as parking spaces, gas stations (GS), restaurants, neighborhood facilities, and event information) can be used as the point information. The division information is information showing that the data 43 of the service information 40 comprises a plurality of divided data. Thereby, on the base station 10, it is possible to transmit service information having a large capacity to the terminal by dividing the same into several pieces. On the terminal, by analyzing the division information, it is possible to temporarily hold the divided data in the storing means until all the data gathers, and to perform data reproducing processing when all the data have gathered. Therefore, the service information having a large capacity can be provided. The partly available information is information which indicates that the reproducing processing can be performed with respect to a data part including no error, even when part of the data 43 includes errors and all of the data 43 cannot be reproduced. Thereby, the terminal can confirm the contents of the data 43 for the time being, or as the case may be, the terminal can obtain the desired information only from the data part including no error. In addition, by using the division information together with the partly available information, even when the provided data 43 comprises divided data and part of the data 43 includes errors which is not reproducible, it is possible for the terminal to grasp at least the summary of the all data by using the data part including no error. In this case, when an error is found at the time all the data gather, the data is corrected and displayed. Or, the data may be successively displayed in order of receipt. The data 43 includes data which is really provided to the terminal, and corresponds to various kinds of information such as map information, traffic information, area information (such as parking spaces, gas stations (GS), restaurants, neighborhood facilities, and events), general information (such as news and weather forecasts), message information (voice, text), live views (still pictures, moving pictures), internet (electronic mails, news, WWW (World Wide Web)), advertisements, and software. While as the identification information included in the address header information 32, the transmission source terminal address 34 and the transmission destination terminal address 35 are shown in figure 2, an example of the identification information which is particularly important for the on-vehicle terminal will be described next. Figure 3 shows an example of a file construction of the identification information included in the address header information 32. As shown in figure 3, the file construction of the identification information included in the address header information 32 comprises an area identification part, a car type identification part, a car identification part, and a user identification part. The area identification part is constituted by countries, prefectures, and municipalities. The car type identification part is constituted by car manufacturers, car types, and year models. The car identification part is constituted by license plate information. In addition, the user identification part is constituted by terminal IDs and user IDs. Figure 4 is a diagram illustrating an example of a file construction in which the files of the respective identification parts are shown in detail. As shown in the figure, as country codes in the area identification part, numeral 1 is assigned to Japan, numeral 2 is to Argentina, numeral 3 is to Croatia, ... etc. Similarly, prefecture codes, municipality codes, car manufacturer codes, user IDs and the like are subdivided and coded, respectively. Next, an example in which part of the identification information is masked to give receiving permission of the service information to a particular on-vehicle terminal group will be described. Figure 5 is a diagram illustrating a file construction in which part of the identification information is masked. Figure 5(a) shows the situation where the respective identification parts of the identification information are not masked. The area identification part is assigned a code number of 10110111, the car type identification part is 11100101, the car identification part is 1001101101, and the user identification part is 11011011, respectively. In a masking example 1 for transmitting repair information to broken-down cars, the code numbers of the area identification part and the user identification part are all cleared, as shown in figure 5(b). Then, the effective identification information is constituted by the car type identification part and the car identification part, thereby providing information aiming at only particular car types or cars to the on-vehicle terminal 20, resulting in providing the repair information of the broken-down cars for the particular car types or cars. In a masking example 2 for transmitting recall information with respect to particular car types, the area identification part, the car identification part, and the user identification part are all cleared, as shown in figure 5(c) . Then, the effective identification information is constituted by the car type identification part, thereby providing the information aiming at only the particular car types to the on-vehicle terminal 20, resulting in providing the recall information for the particular car types. Next, a concrete example of the permission header information 33 in the data structure as shown in figure 2 will be described. Figure 6 is a diagram illustrating an example of a data construction of the permission header information 33. Here, the permission header information 33 is constituted by a period level and a utilization level, as shown in figure 6(a). The period level indicates an available period of the service information, and it can be set as the level 0 indicates the service information can be used only on the appointed day, the level 1 indicates it can be used for 3 days, the level 2 for 7 days, the level 3 for a month, ... etc. In addition, the utilization level indicates the permission of only using, permission of storing or the like as the utilization manner of the service information. For example, the utilization level can be set as the level 0 indicates the permission of utilization without limitation, the level 1 indicates the permission of storing, the level 2 indicates that the data can be stored and is permitted to be used with the limitation (when the utilization period expires, data cannot be used or data is deleted from the storing unit), the level 3 indicates that the data cannot be stored (the data is permitted only to be output on receiving), ... etc. These period level and utilization level can be set by setting code numbers as shown in figure 6(b). Next, operations of the base station unit 10 and the on-vehicle terminal 20, which are constructed as above, will be described. First, to transmit service information from the base station 10, the data generating means 2 in the base station 10 as shown in figure 1 reads out prescribed service information from the service information DB 1, and adds header information to this readout service data. As header information, the address header information 32, the permission header information 33, and further the data identification header 42 as data recognition information of the data 43 is included as shown in figure 2. In addition, when the information should be provided to a particular on-vehicle terminal group, part of the identification information is masked as shown in figure 5. The transmission data which is generated by the data generating means 2 is transmitted to the data transmitting means 3, and the received transmission data is coded/compressed, as well as performed packetting (multiplexed) by the data transmitting means 3 to be a digital communication signal. A carrier wave is modulated by the digital communication signal and the digital communication signal is superimposed to the carrier wave to be a transmission signal. This transmission signal is transmitted from the transmitting antenna 31 to the on-vehicle terminal 20 by using a broadcasting channel. The data transmitted from the base station unit 10 is received by the receiving antenna 41 which is mounted on the on-vehicle terminal 20 shown in figure 1. Hereinafter, the data processing in the on-vehicle terminal 20 will be described with reference to a flowchart shown in figure 7. With reference to the figure, reception processing of the data which is received by the receiving antenna 41 is performed in step S1. This data reception processing is performed by the data receiving means 4 and the received transmission signal is demodulated to obtain a digital signal, as well as the obtained digital signal is separated. Then, after the header information is extracted by the header information extracting unit 66 in the data recognition means 6, the extracted header information is transmitted to the service target judging unit 67. In the service target judging unit 67, the data processing is performed according to following procedures. First, the analysis processing of the address header information is performed in step S2, and the received data is judged whether it is addressed to itself in step S3. In judging, the terminal address which is assigned to itself in the on-vehicle terminal 20 and the transmission destination terminal address 35 in the address header information 32 are compared with each other. When they coincide with each other, the received data is judged to be the data addressed to the on-vehicle terminal 20 and then processing proceeds to the next step. On the other hand, the terminal address which is assigned to itself and the transmission destination terminal address 35 in the address header information 32 do not coincide with each other, the processing returns before step S1 and stands by until the next data is received. In step S4, the received data is judged whether it is set to be refused or not. This judgement is performed so as not to perform reproduction processing of data for the information provided from a particular terminal. The transmission source terminal address 34 in the address header information 32 and the address of the terminal which is set to refuse receiving are compared with each other. When they do not coincide with each other, the information is judged that it is information which is not set to be refused receiving, then the processing proceeds to the next step S5. On the other hand, when the transmission source terminal address 34 in the address header information 32 and the address of the terminal which is set to refuse receiving coincide with each other, the processing returns before step S1 and stands by until the next data is received. Here, the address of the terminal which is set to refuse receiving can be input each time from the operation input means 5. Or, the terminal source address which is input by the operation input means 5 may be held in an integral memory of the data recognition means 6 in advance, and be referred to the integral memory in judging refusal setting in step S4. In step S5, the analysis processing of the permission header information 33 is performed. Then in step S6, it is judged whether the data is permitted to be used or not, and when the data is permitted to be used, the processing goes to the next step S7. When the data is not permitted to be used, the processing returns before step S1 and stands by until the next data is received. Whether the data is permitted to be used or not is judged on the basis of utilization level in the permission header information 33. In step S7, the term of validity of the data is analyzed, and when it is within the validity term, the processing proceeds to the next step S8. When the validity terms already expires, the processing returns before step S1 and stands by until the next data is received. The validity term of the data is judged on the basis of the period level in the permission header information 33. In step S8, it is judged whether the storage of data is permitted or not. When the data storage is permitted, a data storage flag is set to 1 in step S9. On the other hand, when the data storage is not permitted, the data storage flag is set to 0 in step S10. The judgement as to whether the data storage is permitted or not is performed on the basis of the utilization level in the permission header information 33. In step S11, the analysis processing of the data identification header 42 in the service information 40 is performed. By analyzing the data recognition information of the data identification header 42, kinds or contents of the data 43 can be grasped. Then in step S12, by analyzing the data recognition information of the data identification header 42, the data 43 is judged to be data which is necessary for a user or not. When the data 43 is the data which is necessary for the user, the processing proceeds to the next step S13. When the data 43 is the data which is not necessary for the user, the processing returns before step S1 and stands by until the next data is received. In step S13, the data recognition information of the data identification header 42 is analyzed, and it is checked whether division information is included in the data recognition information, whereby the data 43 is judged to be divided data or not. Here, when the data 43 is judged not to be the divided data, the processing proceeds to the next step S14. When the data 43 is judged to be the divided data, the processing proceeds to step S19. In step S19, temporary storage processing of the data 43 is performed and the data 43 is temporarily stored in the data storing means 7. Then in step S20, it is judged whether all of divided data gather or not, on the basis of the division information included in the data identification header 42. When all the data gather, the processing proceeds to the next step S14, and when all the data do not gather yet, the processing returns before step S1 and stands by until the next data is received. In step 20, when the data identification header 42 includes partly use permitting information of the divided data, even if all the data do not gather yet, the processing proceeds to step S14. In step S14, the data 43 is judged whether it includes a plurality of contents or not from the data recognition information in the data identification header 42. When the data 43 is judged to be the data including a plurality of contents, the processing proceeds to step S15 and the separation processing of the data 43 is performed. After the data storage flag is set to 1 in step S16, the data 43 is stored by the inner memory of the data recognition means 6, or the data storing means 7 in step S17. Then in step S18, the reproduction processing of the data 43 which is stored by the inner memory of the data recognition means 6, or the data storing means 7 is performed. By performing the data reproduction processing, reproduced data is output by a display or a speaker in the data output means 8, whereby the user of the on-vehicle terminal 20 can obtain the service information as a picture image or a voice. Here, if the data has a utilization time limit, when the data is within the utilization time limit, the reproduction processing is performed. According to the first embodiment of the present invention, transmitting/receiving of digital data is realized as described above. Service information which is provided from the base station 10 is transmitted after header information having identification information is added to the service information, and the identification information is analyzed in the on-vehicle terminal 20 receiving the transmitted data, whereby only data required by the terminal itself is received and reproduction processing is realized. Therefore, even if the base station 10 distributes various kinds of service information by using a prescribed broadcasting channel, it is possible for a mobile object terminal which receives service information to collect only information really required by the terminal among these various kinds of service information. While in the first embodiment, the example in which the identification information comprises an area identification part, a car type identification part, a car identification part, and a user identification part is shown, other identification items can be added. Of course, identification information may be generated by a single or combination of the respective identification parts. Or, data service may be provided to a particular user by generating various patterns of the identification information by masking part of the identification information as shown in figure 5.

Claims: A method for transmitting/receiving digital data between a base station and a mobile object terminal installed on a mobile object existing in a service area, wherein the base station transmits the data after identification information is added in the header information of a service information which is supplied to the mobile object terminal by using a broadcast channel; and the mobile object terminal has an address showing the received identification information, analyses the identification information by indicating the address, and enables to identify whether the service information is provided to the mobile object terminal itself, wherein the base station transmits the data after data recognition information related to the service information is further added in the header information of the service information which is supplied to the mobile object terminal; and the mobile object terminal analyses the data recognition information and enables to collect necessary information from the service information which is provided to the terminal Itself, the data recognition information includes: point information being used by the mobile object terminal to collect data which relates to an arbitrary point or area from the service information, division information indicating that the service information which is transmitted from the base station comprises a plurality of divided data, and partly available information indicating that the reproduction processing can be performed with respect to a data part of the service information including no error, even when part of the service information includes errors and all of the service information cannot be reproduced; and the mobile object terminal collects the service information that is navigation information related to an arbitrary point or area by using the point information, stands by the data reproduction processing until all data is gathered on the basis of the division information, and performs reproduction processing of the partly available service information even when part of the service information is lacking, if the content of the partly available information indicates that it is possible to be reproduced. The digital data transmitting/receiving method as defined in claim 1, wherein the data recognition information is Information indicating that a plurality of service information are included; and the mobile object terminal analyses the data recognition information and performs data processing after performing separation processing of the service information. A base station unit used for transmitting/receiving digital data between a base station and a mobile object terminal installed on a mobile object existing in a service area, wherein the base station provides service information to the mobile object terminal by digital communication by using a broadcasting channel, comprising: a data transmitting means for transmitting service information to the mobile object terminal, a service information data base holding various kinds of service information which are supplied to the mobile object terminal: and a data generating means for generating service information which is transmitted by the data transmitting means, by adding header information including identification information to data which is read out from the service information data base, wherein the data generating means comprises a data recognition information adding means for adding, in header information of the service information supplied to the mobile object terminal, data recognition information which allows the mobile object terminal to collect necessary information from the provided service information, wherein the data recognition information includes: point information being used by the mobile object terminal to collect data which relates to an arbitrary point or area from the service information, division information indicating that the service information which is transmitted from the base station comprises a plurality of divided data, and partly available information indicating that the reproduction processing can be performed with respect to a data part of the service information including no error, even when part of the service information includes errors and all of the service information cannot be reproduced. A mobile object terminal unit used for transmitting/receiving digital data between a base station and the mobile object terminal installed on a mobile object existing in a service area, wherein the base station provides service information to the mobile object terminal by digital communication by using a broadcast channel, comprising: a data recognition means for analysing data recognition information which is added in the header information of the service information by the base station and enables to collect necessary Information among the service information which is supplied to the terminal, wherein the data recognition information includes: point information being used by the mobile object terminal to collect data which relates to an arbitrary point or area from the service information, division information indicating that the service information which is transmitted from the base station comprises a plurality of divided data, and partly available information indicating that the reproduction processing can be performed with respect to a data part of the service information including no error, even when part of the service information includes errors and all of the service information cannot be reproduced; and the mobile object terminal collects the service information that is navigation information related to an arbitrary point or area by using the point information, stands by the data reproduction processing until all data is gathered on the basis of the division information, and performs reproduction processing of the partly available service information even when part of the service information is lacking, if the content of the partly available information indicates that it is possible to be reproduced.

Inventors: FUKUDA HISAYA, NOHARA AKIRA, SUZUKI AKIHIRO, TANIGUCHI TOMOHIKO, FUKUDA, HISAYA, NOHARA, AKIRA, SUZUKI, AKIHIRO, TANIGUCHI, TOMOHIKO
Applicants: MATSUSHITA ELECTRIC IND CO LTD, MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Application year: 1999
Main classification: H04H1
IPC codes: H04N7, H04H60, H04B7, H04H20, H04W92, H04W4, H04W48