JPH09261731A - Mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication system in which service information is efficiently transmitted. SOLUTION: A service information division section 205 divides service information into service information with high importance and service information with low importance. An in-small-zone transmission section 209 applies time division to the service information with high importance and service information with low importance and stores them to time slots, and distributes the time slots in a prescribed service area in terms of infrared rays. Each of slave stations 21a1, 21a2, 21b1, 21b2 has an infrared ray transmission section to form a service area at the circumferential edge of master stations 20Aa, 20Ab. The service area of the slave stations 21a1, 21a2 and the service area of the slave stations 21b1, 21b2 form an overlap zone. A transmission start time decision section 203 and a inter-master-slave station transmission section 208 are used to send service information to slave stations so that service information storage parts of each time slot with high importance are not timewise overlapped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a mobile communication system including a portable information terminal for infrared communication and delivering service information to the portable information terminal.

In recent years, high-speed infrared wireless communication of about 1 Mbps to 10 Mbps has been put into practical use, and a mobile communication system including a portable information terminal for infrared communication and delivering service information to this portable information terminal is considered. .

FIG. 11 is a block diagram showing the overall configuration of a conventional mobile communication system. The mobile communication system of FIG. 11 is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-30954, and wireless base stations 1000a and 1000b and a zone management station 2000 are arranged at a predetermined distance.
And a mobile terminal 3000.

The respective radio base stations 1000a and 1000b are
It has a transmission part (not shown) which transmits service information by infrared rays. For example, in order to guide a visitor of a museum through an image or voice of an exhibit, the information transmitting units of the respective wireless base stations 1000a and 1000b transmit different service information by infrared rays of the same wavelength from the upper part such as the ceiling of the exhibition hall. There is.

The infrared rays transmitted by the information transmitting section of the radio base station 1000a are spread over a predetermined viewing angle ω, and the infrared intensity is set so that the mobile terminal 3000 can receive the service information within the zone 1000Za (for example, radius 3m). Stipulated in. Thereby, the mobile terminal 3000 can receive the service information transmitted from the radio base station 1000a within the zone 1000Za.

The infrared rays transmitted by the information transmitting section of the radio base station 1000b are spread over a predetermined viewing angle ω, and the infrared intensity is such that the mobile terminal 3000 can receive the service information within the zone 1000Zb (for example, radius 3m). Stipulated in. Thereby, the mobile terminal 3000 can receive the service information transmitted from the radio base station 1000b in the zone 1000Zb.

By the way, the zones 1000Za, 1000
When the range of Zb is relatively narrow and the zones 1000Za and 1000Zb are distant from each other, when the mobile terminal 3000 moves from the zone 1000Za to the zone 1000Zb, the service information received between the zones is interrupted. In order to prevent such interruption of information, the zone 1000Za and the zone 1000Zb are defined as the zone 10
It overlaps at 00Zc.

When the wireless base stations 1000a and 1000b transmit the service information at the same timing when the zones are overlapped in this way, the service information transmitted by the wireless base stations 1000a and 1000b interferes in the overlap area. To avoid this, zone management station 2
000 adjusts the timing of service information transmitted by the wireless base stations 1000a and 1000b.

FIG. 12 shows a radio base station 1000a of FIG.
It is a figure which shows the time slot of the service information which 1000b transmits. In FIG. 12, a time slot Ta indicates a time when the radio base station 1000a transmits service information, and the radio base station 1000a transmits service information within the time of the time slot Ta. The time slot Tb indicates the time when the wireless base station 1000b transmits the service information, and the wireless base station 1000b transmits the service information within the time of the time slot Tb.

At this time, the mobile terminal 3000 is in the zone 1
When in the zone 1000Za other than 000c, the service information from the radio base station 1000a can be received at the time of the time slot Ta. Zone 1 that overlaps
When the mobile terminal 3000 moves within 000Zc, the mobile terminal 3000 can receive service information from the radio base station 1000a during the time slot Ta, and can receive service information from the radio base station 1000b during the time slot Tb. In addition, zone 1000Zb other than zone 1000c
When moving in, the mobile terminal 3000 can receive service information from the radio base station 1000b during the time of the time slot Tb.

By the above operation, in the wireless mobile communication system using the same wavelength, the interference in the overlap area is avoided and the mobile terminal 3000 can receive the service information.

[0012]

However, in the above-described conventional wireless mobile communication system using the same wavelength, in order to avoid interference in the overlapping zones, the adjacent wireless base stations 1000a and 1000b are prevented from interfering with each other. The time slots Ta and Tb are set to all the radio base stations 1000 so that the time slots Ta and Tb do not overlap at all.
a and 1000b are assigned by time division multiplexing. Therefore, even in the non-overlapping zones, the radio base stations 1000a and 1000b cannot transmit during the time other than allocation, and have to stop transmitting service information and wait. Therefore, the conventional mobile communication system has a problem that the service information cannot be efficiently transmitted.

Therefore, it is an object of the present invention to solve the above technical problems and to provide a mobile communication system capable of efficiently transmitting service information.

[0014]

A mobile communication system including a portable information terminal for infrared communication and delivering service information to the portable information terminal, wherein the service information is highly important service information, and Service information dividing means for dividing into lesser service information, service information storing means for storing time-divisionally stored service information of high importance and service information of less importance, and service information storing means It has a central station that distributes the time slot storing the service information of the above with infrared rays in a predetermined main service area, and an infrared transmitter, forms a sub-service area at the periphery of the main service area of the central station, and other central stations. Form an overlap zone with other sub service areas formed around the main service area of Of the number of satellite stations and the service information storage portion of the time slot distributed by the central station, which is synchronized with the service information storage portion of the time slot distributed by other central stations. Control means for distributing service information through the satellite station so that they do not overlap.

The plurality of mobile communication systems may be managed by the server, and the service information dividing means, the service information storing means, and the control means may be provided in the server.

The mobile terminal may also be provided with reception information selection means for selecting one of a plurality of highly important service information storage portions of the time slots transmitted by each satellite station in the overlap zone.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a mobile communication system according to the first embodiment of the present invention.

In FIG. 1, the mobile communication system includes two radio base stations 2a and 2b including master stations 20Aa and 20Ab and a plurality of (two in the figure) slave stations 21a1, 21a2, 21b1 and 21b2. And a mobile terminal 3A.

Each parent station 20A of each radio base station 2a, 2b
a, 20Ab and slave stations 21a1, 21a2, 21b1, 2
1b2 has a transmitter (described later) for transmitting service information by infrared rays. For example, the radio base stations 2a and 2b are used to guide visitors to the museum with images and sounds.
Each parent station 20a, 20b and child station 21a1, 21a2, 2 of
The information transmitters 1b1 and 21b2 respectively transmit service information by infrared rays of the same wavelength from the upper part such as the ceiling of the exhibition hall. In addition, the master station 20a and the slave stations 21a1 and 21a
2, the service information transmitted by the information transmission unit and the master station 20
b, the service information transmitted by the information transmitters of the slave stations 21b1 and 21b2 is different.

The infrared rays transmitted by the information transmitting section of the master station 20Aa are spread over a predetermined viewing angle ω, and the infrared ray intensity is within the zone 20Za (for example, radius 3m), the mobile terminal 3A.
Are defined to receive service information. Thereby, the mobile terminal 3A can receive the service information transmitted from the master station 20Aa in the zone 20Za.

The infrared rays transmitted by the information transmitting section of the master station 20Ab are spread over a predetermined viewing angle ω, and the infrared ray intensity is within the zone 20Zb (for example, radius 3m), the mobile terminal 3A.
Are defined to receive service information. Thereby, the mobile terminal 3A can receive the service information transmitted from the master station 20Ab in the zone 20Zb.

By the way, when the range of the zones 20Za and 20Zb is relatively narrow and the zones 20Za and 20Zb are separated from each other, when the mobile terminal 3A moves from the zone 20Za to the zone 20Zb, the reception between the zones is performed. Service information to be interrupted is interrupted. In order to prevent such breaks in information, the transmitters of the slave stations 21a1 and 21a2 transmit service information by infrared rays to the ring-shaped zone 21Za around the periphery of the zone 20Za. Child station 21b
The transmitters 1 and 21b2 transmit the service information to the ring-shaped zone 21Zb on the periphery of the zone 20Zb by infrared rays. Zone 21Za and zone 21b are zone 2
Overlapping at 1Zc. The zone 21Za1 in FIG. 1 is formed by the slave station 21a1, and the zone 21Zb1 is formed by the slave station 21b1.

In this way, when the zones are overlapped and the slave stations 21a1, 21a2, 21b1, 21b2 transmit the service information at the same timing, the slave stations 21a1, 21a2, 21b1, 21b in the overlap area.
2 interferes with the service information transmitted. In order to avoid this, the master stations 20Aa, 20Ab are connected to the slave stations 21a1, 21a.
service information transmitted by a2, 21b1, 21b2,
I try to adjust the timing.

FIG. 2 is a diagram showing an example of a concrete configuration of the master stations 20Aa and 20Ab of FIG. FIG. 3 is similar to FIG.
It is a figure which shows an example of a specific structure of the slave stations 21a1, 21a2, 21b1, 21b2. Further, FIG. 4 is a diagram showing an example of a specific configuration of the mobile terminal 3A of FIG. Less than,
2 to 4, the master stations 20Aa, 20Ab, the slave stations 21a1, 21a2, 21b1, 21b2, the mobile terminal 3
The configuration of A will be sequentially described.

In FIG. 2, each master station 20Aa, 2Ab
Respectively, the inter-master station transmitting unit 200 and the inter-master station receiving unit 2
01, the synchronization control unit 202, and the transmission start time determination unit 20.
3, a service information storage unit 204, a service information division unit 205, a large importance buffer unit 206, a small importance buffer unit 207, a parent-child transmission unit 208, and a small zone transmission unit 209.

The inter-master station transmitter 200 transmits control information for controlling the synchronization of time-division multiplexed time slots between the master stations. The inter-master station receiving unit 201 receives control information for controlling synchronization of time-division multiplexed time slots between the master stations. The synchronization control unit 202 generates control information for establishing synchronization, transmits the control information to the inter-master station transmission unit 200, and uses the control information received by the inter-master station reception unit 201 from another master station to time-division-multiplex time slots. Control the synchronization of. The transmission start time determination unit 203 controls so that the communication start times do not match between the adjacent wireless base stations forming the overlapping zone based on the control information received by the inter-master station reception unit 201, and determines the transmission start time. .

The service information storage unit 204 stores service information. The service information dividing unit 205 divides the service information according to the degree of importance. When the service information is image information including, for example, a person and a background, the service information dividing unit 205 searches for the contour of the person, and sets the person cut out from the contour as the service information of high importance. This is because even if the background is not known, it is enough as information if only the person is known. Further, when the service information is, for example, text information or image information related to application documents including an application, a description, a drawing, and an abstract, the service information dividing unit 205 searches for the abstract and extracts the extracted abstract. The part is the service information of high importance. This is because it is sufficient to access the technical information if the outline of the invention is understood even if the details of the invention are not understood.

The high importance buffer section 206 stores the divided service information of high importance. The small importance buffer unit 207 stores the divided service information of low importance. The parent-child transmission unit 208 transmits the generated transmission start information and service information of high importance to the child station. The small zone transmission unit 209 starts transmission according to the transmission start information, time-division-multiplexes all the information, and performs zone 21 Za (21
The zone 20Za (20Zb) in Zb) is transmitted.

In FIG. 3, each slave station 21a1, 21a
2, 21b1 and 21b2 are the parent-child receiving unit 1 respectively.
61, a transmission start information section 162, a transmission start buffer section 163, and an overlap zone transmission section 164.

The parent-child receiver 161 receives the transmission start information and the service information of high importance from the parent station which controls the own station. The transmission start information section 162 is the parent-child receiving section 1
The transmission start information received in 61 is stored. The transmission start buffer unit 163 stores the highly important service information received by the parent-child reception unit 161. The overlap zone transmission unit 164 compares the service information of high importance stored in the service information buffer unit 163 with the transmission start information unit 1.
Transmission is started based on the transmission start information 62, and highly important information is time-division multiplexed and transmitted.

In FIG. 4, the mobile terminal 3 includes a receiving unit 17
1 and a transmission start information part 172. Receiver 171
Receives the transmitted service information according to the transmission start information of the time slot. The transmission start information section 172 stores the transmission start information of the time slot being received.

FIG. 5 shows the master stations 20Aa and 20Ab of FIG.
It is a figure which shows the time slot which the slave stations 21a1, 21a2, 21b1, 21b2 transmit. In particular, FIG.
(A) is a time slot 20T transmitted by the master station 20Aa.
5A shows the time slot 20Tb transmitted by the master station 20Ab, and FIG. 5C shows the slave stations 21a1, 21a2.
5D, the time slot 21Ta transmitted by the slave stations 21b1 and 21b2 is shown in FIG.
b are shown respectively.

In FIG. 5, the time slots 20Ta and 20Tb of the master stations 20Aa and 20Ab are time slots 20Ta for transmitting service information of high importance.
1, 20Tb1 and time slots 20Ta2, 20Tb2 for transmitting less important service information, respectively. Time slot 20Ta of the parent station 20Aa
And the time slot 20Tb of the master station 20Ab are temporally offset by the transmission time of the time slot 20Ta1. The time slot 21Ta transmitted by the slave stations 21a1 and 21a2 is the time slot 20 of the master station 20Aa.
The service information, which has the same time as Ta1 and is highly important, is transmitted. The time slot 21Tb transmitted by the slave stations 21b1 and 21b2 temporally coincides with the time slot 20Tb1 of the master station 20Ab, and transmits highly important service information.

Next, the operation of the wireless mobile communication system shown in FIG. 1 will be described. The master stations 20Aa and 20Ab are
The inter-master-station transmitting unit 200 and the inter-master-station receiving unit 201 transmit and receive control information for establishing synchronization of time slots to be transmitted. The received control information is transmitted to the synchronization control unit 202 and establishes the synchronization of the time division multiplex time slots. Further, the control information is also transmitted to the transmission start time determination unit 203, determines the position of the master station, controls so that the communication start times do not match between the adjacent master stations forming the overlapping zone, and starts transmission. Determine the time.

On the other hand, the service information stored in the service information storage unit 204 is divided by the service information division unit 205 into service information of high importance and service information of low importance according to the importance of the service information. The service information of high importance is stored in the high importance buffer unit 206.
In addition, the service information of low importance is stored in the small importance buffer section 2
07 are stored respectively.

The transmission start information generated by the transmission start time determination unit 203 and the service information stored in the large importance buffer unit 206 are transmitted by the parent-child transmission unit 208 to the slave station 2
1a1, 21a2, 21b1, 21b2.
The slave stations 21a1, 21a2, 21b1, 21b2 receive the transmission start information and the service information by the parent-child receiver 161.

The small zone transmitters 209 of the master stations 20Aa and 20Ab start transmission according to the transmission start information from the transmission start information determiner 153, and the large importance buffer 20
All the service information of high importance stored in 6 and the service information of low importance stored in the small importance buffer unit 207 are continuously time-division multiplexed, and the zone 20Z
a, 20Zb.

Child stations 21a1, 21a2, 21b1, 21
b2 is received by the parent-child reception unit 161 by the overlap zone transmission unit 164, and the service information buffer unit 1 is received.
Transmission of the service information stored in 63 is started by the transmission start information of the transmission start information section 162, and highly important information is discretely time-division multiplexed and transmitted.

When the mobile terminal 3A is in the zone 20Za, the service information is received from the master station 20a according to the transmission start information of the time slot 20Ta received by the reception unit 171, and the time slot currently received by the transmission start information unit 172 is received. The transmission start information of 20Ta is stored. Further, the receiving unit 171 of the mobile terminal 3 continuously receives the service information of high importance and the information of low importance from the master station 20Ba. When the mobile terminal 3A moves from the zone 20Za to the overlap zone 21Zc, the receiving unit 1 of the mobile terminal 3
71 is a slave station 21a1, 21a2 and a slave station 21b1,2
1b2 and service information of high importance are received respectively. In this case, the slave stations 21a1 and 21a2 and the slave station 21
Service information having high importance may be alternately received from b1 and 21b2. Also, the transmission start information section 17
Time slot 2 currently being received stored in 2
The same important information as in the zone 20Za may be continuously received by the transmission start information of 1Ta. The mobile terminal 3A moves from the overlap zone 21Zc to the zone 20.
When moving to Zb, the receiving unit 171 of the mobile terminal 3 continuously receives the service information of high importance and the information of low importance from the master station 20Bb.

As described above, according to the wireless mobile communication system of the first embodiment, the service information is divided into the information of high importance and the information of low importance according to the importance, and the wireless base station Synchronize between stations, do not match the transmission start time between adjacent radio base master stations forming the overlap area, in the overlap area, only information of high importance is transmitted by time division multiplexing, All information is transmitted except for the overlap area. Therefore, it is possible to avoid the incommunicable area due to the interference in the overlap area,
Information can be continuously received in the zone, and communication with high transmission efficiency can be performed.

FIG. 6 is a block diagram showing the overall configuration of a mobile communication system according to the second embodiment of the present invention. In addition,
Portions corresponding to those in the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 6, in the wireless mobile communication system, a master station 20B is used instead of the master stations 20Aa and 20Ab.
a, 20Bb are used and the server 1 is provided.

FIG. 7 is a diagram showing an example of a specific configuration of the server 1 shown in FIG. 7, the server 1 includes a server base station receiving unit 231, a synchronization control unit 232, a transmission start time determining unit 233, an information storage unit 234, an information dividing unit 235, and a large importance buffer unit 236. , A low importance buffer unit 237 and a server-base-station transmitting unit 238.

The inter-server / base-station receiving unit 231 is the master station 20.
Control information for controlling synchronization of time-division-multiplexed time slots with Ba and 20Bb is received. Synchronization control unit 232
Controls the synchronization of time-division multiplexed time slots based on the control information received by the inter-server-base-station receiving unit 231. The transmission start time determination unit 233 includes a server base station reception unit 23.
The transmission start time is determined by controlling so that the transmission start times do not match between the adjacent radio base station master stations forming the overlapping zone based on the control information received in 1.

The information storage section 234 stores service information. The information division unit 235 divides the service information according to the degree of importance. The high importance buffer unit 236 stores the divided service information of high importance. The small importance buffer unit 237 stores the divided service information of low importance. The inter-server / base-station transmitting unit 238 transmits the transmission start information and the service information generated by the transmission start time determining unit 233 to the radio base master stations TPB1 and 22T2.

FIG. 8 is a diagram showing an example of a concrete configuration of the master stations 20Ba and 20Bb of FIG. In FIG. 8, the master stations 20Ba and 20Bb include a synchronization control unit 241, a server-base-station transmitting unit 242, and a server-base-station receiving unit 243.
A transmission start information section 244 and a high importance buffer section 24
5, the small importance buffer section 246, and the parent-child transmission section 24
7 and a small zone transmission unit 248.

The synchronization control section 241 generates control information for establishing synchronization. The inter-server-base-station transmitting unit 242 transmits the control information to the server S22. The inter-server-base-station receiving unit 243 receives the transmission start information and the service information from the server S22. The transmission start information section 244 stores the transmission start time received by the inter-server-base-station receiving section 243.

The high importance buffer section 245 stores the service information of high importance received by the inter-server base station receiving section 243. The small importance buffer unit 246 stores the low importance service information received by the inter-server base station receiving unit 243. The parent-child transmission unit 247 uses the child stations 21a1 and 21a1.
The transmission start information and the highly important information of the received transmission service information are transmitted to 1a2, 21b1, 21b2. The small zone transmission unit 248 starts transmission according to the transmission start information, time division multiplexes all information, and transmits to the small zone 22Z11 in the zone 22Z1.

Next, the operation of the wireless mobile communication system shown in FIG. 6 will be described. The master stations 20Ba and 20Bb are
The control information for establishing synchronization of the time slots generated by the synchronization control unit 242 is transmitted to the server 1 by the server-base-station transmitting unit 241.

The server 1 receives the control information at the server base station receiving unit 231. The received control information is transmitted to the synchronization control unit 232 to establish the synchronization of the time division multiplex time slots. The control information is the transmission start time determination unit 233.
Is also transmitted to, determines the position of the radio base master station from the control information, controls so that the communication start time does not match between adjacent radio base master stations forming overlapping zones,
Determine the transmission start time.

On the other hand, the service information accumulated in the information accumulating section 234 is divided by the information dividing section 235 into information of high importance and information of low importance according to the importance of the service information. High importance buffer 23
6, the information of low importance is stored in the small importance buffer unit 237, respectively. The server base transmission unit 238 sends the transmission start information generated by the transmission start time determination unit 233 and the service information stored in the high importance buffer unit 236 and the low importance buffer unit 237 to the master station 20Ba,
Send to 20Bb.

The master stations 20Ba and 20Bb receive the transmission start information and the service information by the inter-server / base-station receiving unit 243. Then, the received transmission start information is stored in the transmission start information section 244, information of high importance is stored in the importance buffer section 245, and information of low importance is stored in the small importance buffer 2
46 respectively.

The small zone transmission unit 248 starts transmission by the transmission start information, time-division-multiplexes all information from the large importance buffer unit 237 and the small importance buffer unit 238, and the small zone 22Z11 in the zone 22Z1. Send to. In addition, only the transmission start time and the information having high importance are transmitted to the slave stations 21a1, 21a2, 21b1, by the parent-child transmission unit 247.
21b2.

As described above, according to the wireless mobile communication system of the second embodiment, the server 1 divides service information into highly important information and less important information according to the importance. At the same time, the transmission start information is generated so that the transmission start times do not match between the adjacent radio base stations forming the overlap area, and these processes are concentrated on the server. Therefore, the processing of the master stations 20Ba and 20Bb is reduced, and the load of the master stations 20Ba and 20Bb is reduced. In addition, with a simple configuration, it is possible to avoid an incommunicable area due to interference in the overlap area, continuously receive information in the zone, and perform transmission with high transmission efficiency.

FIG. 9 is a block diagram showing the overall configuration of a mobile communication system according to the third embodiment of the present invention. In addition,
Portions corresponding to those in the first embodiment shown in FIGS. 1 to 5 are designated by the same reference numerals, and the description thereof will be omitted.

In the wireless mobile communication system of FIG. 9, a mobile terminal 3B is used instead of the mobile terminal 3A.

FIG. 10 is a diagram showing an example of a specific configuration of the mobile terminal 3B of FIG. In FIG. 10, the mobile terminal 3
B includes a reception information selection unit 261, a reception unit 262, and a transmission start information unit 263.

By the way, when the mobile terminal moves to the overlap zone 21Zc, the mobile terminal receiving section determines that the mobile station 2
1a1 and 21a2 and the slave stations 21b1 and 21b2 respectively receive service information of high importance. In this case, service information having a high degree of importance is alternately received, so that both pieces of information may be difficult to understand and may be troublesome. Therefore, in the mobile terminal 3B, the reception information selection unit 2
61 and a transmission start information section 263 are provided.

The reception information selection unit 261 selects a time slot of desired service information from the received communication start information. The receiving unit 262 receives the transmitted service information according to the transmission start information of the selected time slot. The transmission start information part 263 stores the transmission start information of the time slot being received.

Next, the operation of the wireless mobile communication system shown in FIG. 9 will be described. Mobile terminal 3B is zone 25Z
If it is within 11, the reception unit 262 follows the master station 20a, 20b according to the transmission start information of the received time slot.
The service information is received from and the transmission start information section 263 stores the transmission start information of the time slot being received. When the mobile terminal 3B moves from the zone 25Z11 to the overlap zone 25Z3, the reception unit 262 determines that the mobile station 21a
1, 21a2 and the slave stations 21b1, 21b2 respectively receive transmission start information and service information. The reception information selection unit 261 selects the transmission start time of the time slot of the desired service information from the received transmission start information, and receives the received highly important information in either the zone 25Z1 or the zone 25Z2. .

As described above, according to the wireless mobile communication system of the third embodiment, the mobile terminal can select the reception information. Therefore, it is possible to avoid the incommunicable area due to the interference in the overlap area, and in the overlap area, it is possible to select and receive only the information of high importance of the information to be received, and a situation in which both information are reproduced alternately. Prevented,
Easy to understand the selected information.

The configurations of the wireless mobile communication system, the wireless base station and the wireless base station according to claim B3 of the present invention have been described with reference to FIGS. B9, 10 and 10 of the sixth embodiment of the present invention. It is possible to have the same configuration as the above.

[0063]

According to the present invention, service information is divided into service information of high importance and service information of low importance, and service information of high importance and service information of low importance are classified. Service information is sent to satellite stations that are divided into divisions and stored in time slots to form an overlap zone so that the highly important service information storage parts of the time slots distributed by each central station do not overlap in time. As a result, each satellite station forming the overlap zone can transmit highly important service information while avoiding mutual interference,
Each central station provides service information in individual time slots,
The service information can be transmitted continuously, and the service information can be efficiently transmitted.

Further, according to the present invention, the plurality of mobile communication systems are managed by the server, and the service information dividing means, the service information storing means, and the controlling means are provided in the server. The load on the central office is reduced.

Further, according to the present invention, since the mobile terminal selects one of a plurality of highly important service information storage portions of the time slots transmitted by each satellite station in the overlap zone, In the lap area, it is possible to select and receive only the highly important information to be received, prevent a situation in which both the information are reproduced alternately, and easily understand the selected information.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a mobile communication system according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a specific configuration of master stations 20Aa and 20Ab of FIG.

FIG. 3 shows slave stations 21a1, 21a2, 21b1, 2 of FIG.
It is a figure which shows an example of the specific structure of 1b2.

FIG. 4 is a diagram showing an example of a specific configuration of a mobile terminal 3A of FIG.

5 is a diagram showing the master stations 20Aa and 20Ab and the slave station 2 of FIG.
It is a figure which shows the time slot which 1a1, 21a2, 21b1, 21b2 transmits.

FIG. 6 is a block diagram showing an overall configuration of a mobile communication system according to a second embodiment of the present invention.

FIG. 7 is a diagram showing an example of a specific configuration of the server 1 of FIG.

8 is a diagram showing an example of a specific configuration of master stations 20Ba and 20Bb of FIG.

FIG. 9 is a block diagram showing an overall configuration of a mobile communication system according to a third embodiment of the present invention.

FIG. 10 is a diagram showing an example of a specific configuration of the mobile terminal 3B of FIG.

FIG. 11 is a block diagram showing an overall configuration of a conventional mobile communication system.

FIG. 12 is a radio base station 1000a, 1000b of FIG.
It is a figure which shows the time slot of the service information which is transmitted.

[Explanation of symbols]

 1 ... Server 2a, 2b ... Radio base station 3A, 3B ... Mobile terminal 20Aa, 20Ab, 20Ba, 20Bb ... Master station 21a1, 21a2, 21b1, 21b2 ... Slave station 164 ... Overlap transmission unit 203 ... Transmission start time determination unit 205 ... Service information division unit 208 ... Parent-child transmission unit 209 ... Small zone transmission unit

Claims (3)

[Claims] 1. A portable information terminal for infrared communication is included,
A mobile communication system for delivering service information to the portable information terminal, the service information dividing unit dividing the service information into highly important service information and less important service information, and a high importance information. Service information storing means for storing service information and less important service information in a time slot in a time division manner, and a time slot storing the service information from the service information storing means by infrared rays in a predetermined main service area. It has a central station for distribution and an infrared transmitter, forms a sub-service area at the periphery of the main service area of the central station, and also overlaps with other sub-service areas formed at the periphery of the main service area of another central station. A plurality of satellite stations forming a lap zone, and the time distributed by the central station Through the satellite station, the service information is synchronized with the lot important service information storage portion and does not overlap in time with the time slot highly important service information storage portion distributed by the other central station. A mobile communication system comprising: 2. A plurality of mobile communication systems are managed by a server, and the service information dividing unit, the service information storing unit, and the control unit are provided in the server. The mobile communication system according to Item 1. 3. The mobile terminal comprises reception information selection means for selecting one of a plurality of highly important service information storage portions of time slots transmitted by each satellite station in the overlap zone. Or the mobile communication system according to 2.