JP2002158617A - Service-information providing method, and base station and terminal used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a service information providing method, by which a base station provides service information to many terminals at the same time. SOLUTION: The base station uses a cellular phone of the TDMA system, to broadcast charge free service information and pay service information, at the same time. A terminal (a) acquires only information of a channel C1 and a terminal (b) acquires only the information of a channel C2. Furthermore, a terminal (c) is a terminal that makes no contract of acquisition of the pay service information, receives service information of a channel C6 but acquires only the charge free service information, because the terminal (c) has no decoding key of the pay service information. A terminal (d) is a terminal, that makes a contract of acquisition of the pay service information, receives the service information of the channel C6 and acquires the charge free service information and the pay service information, because the terminal (d) has a decoding key.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for providing service information from a base station to a terminal, and a base station and a terminal used for the method.

[0002]

2. Description of the Related Art Conventionally, in a general line-connection type cellular telephone, it is impossible to communicate (broadcast) from a base station to many terminals. It is necessary to transmit information sequentially, which reduces the use efficiency and limits the number of terminals accommodated per base station. Also, it is disadvantageous from the viewpoint of cost effectiveness to newly develop an infrastructure suitable for broadcasting, and it is difficult to secure extra area coverage.

[0003] The present invention has been made in view of the above problems, and has as its object to provide a method capable of simultaneously providing service information from a base station to a large number of terminals, and a base station and terminals used therein.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a base station allocates a specific channel among access channels used for wireless communication with a terminal for service information and broadcasts the allocated channel. Do
A terminal receives a broadcast signal and acquires service information of the specific channel.

According to the present invention, service information can be simultaneously provided from a base station to a large number of terminals.

[0006] In this case, the base station encrypts and broadcasts the service information of the specific channel, and only the terminal having a key for decrypting the service information encrypts the service information of the specific channel. If the service information of the channel is obtained, the service information can be provided only to a specific terminal.

[0007] The invention according to claims 3 and 4 is characterized by a base station and a terminal used in the service information providing method according to claims 1 and 2.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 1 shows the system configuration.

The service information is transmitted from a host station (not shown) to the base station 10 via the network 30, and is transmitted from the base station 10 to an unspecified number of terminals (for example, cellular telephones) 20.
Information is broadcast to. Here, the base station 10 broadcasts by allocating a specific channel among the access channels used for wireless communication with the terminal 20 for service information. The terminal 20 receives the broadcast signal and acquires service information of a specific channel. An existing system (for example, a PDC or PHS system) can be used as the infrastructure in this system. In addition, as a communication method between the base station 10 and the terminal 20, TDMA (time division multiple access), FDMA (frequency division multiple access), CDMA (code division multiple access), or the like can be used.

With such a configuration, when service information is continuously provided from the base station 10, communication from the terminal 20 to the base station 10 is not required.
Even when the number of 0s is large, overhead does not occur and more terminals 20 can be accommodated.

The base station 10 encrypts and broadcasts the service information, and transmits a key for decrypting the broadcast (a decryption key of the encrypted information or a parameter (such as a channel) for receiving the service information). Only the terminal having the service information may be able to receive the service information. Also, the service information to be provided is broadcasted separately for free and paid services, and only terminals that have previously signed a usage contract so that paid service information can be received have a key to decrypt it. You may make it acquire paid service information.

FIG. 2 is a timing chart showing an embodiment in which free service information and pay service information are simultaneously broadcast using a TDMA type cellular telephone.

[0013] C1 to C6 in the figure indicate channel numbers of time slots. Further, the base station 10 provides free service information and paid service information on the channel C6.

In FIG. 2, terminal a acquires only information on channel C1, and terminal b acquires only information on channel C2. The terminal c is a terminal that has not contracted to acquire paid service information and receives the service information of the channel C6. However, the terminal c does not have a key for decrypting the paid service information. Get service information only. The terminal d is a terminal that has a contract for obtaining paid service information, receives the service information of the channel C6, and has a key for decryption. Therefore, the terminal d obtains free service information and paid service information.

The present invention can also be configured to provide service information in a limited area by wireless communication between the base station 10 and the terminal 20.

FIG. 3 shows a configuration of an embodiment for providing service information to the terminal 20 on an expressway.

A terminal mounted on a vehicle (called a mobile terminal in this embodiment) receives a key for using a service at an interchange entrance or the like when entering a road on which a service is provided. This key is a decryption key for the encrypted information or a parameter (such as a channel) for receiving the broadcast information.

In order to provide service information, one of the existing line connection type services such as PDC and PHS on the road is provided.
One or a plurality of channels (specific channels) are reserved, and distribution is always performed from the base station 10 in a form occupying the channels.

In order for a mobile terminal having a service key to receive information, it can be realized by omitting a normal line connection procedure and monitoring a broadcast channel from the base station 10 as a reception-only channel. Usually, by allocating a channel occupied by one terminal for broadcasting, the channel can be used for providing one-to-many services. Further, the encrypted information is decrypted using the key received when entering the road. By properly using a plurality of encryption keys, a service target person can be selected.

[0020] Further, information on the boundary of the area for providing the service is given to the mobile terminal in advance or to a parameter received at the time of entering the road.
When the mobile terminal crosses the boundary of the base station 10, switching to the base station 10 existing at the movement destination is performed by using the parameters in an optimized procedure. In addition, in order for the mobile terminal to identify the boundary of the base station 10, the mobile terminal may acquire the position information (GPS information) of the own terminal.

By using the above-described method, the same information is transmitted only once (or in a long period) and the transmission efficiency can be increased, so that the number of terminals accommodated in the base station 10 can be increased. .

The present invention can also be applied to a case where service information is provided to the terminal 20 in a theme park. FIG. 4 shows the configuration of the embodiment.

There are a plurality of base stations 10 forming a small cell in the theme park. A terminal (owned as a mobile terminal in this embodiment) owned by the user receives a key and information indicating a boundary between small cells when entering the theme park. The key includes a plurality of base stations 10 forming a small cell.
(Decryption key or parameter) for using part or all of the information.

Some or all of the communication channels are allocated exclusively for information providing broadcasting, and a plurality of base stations 10 forming a small cell provide different information for each area in the theme park.

In this case, it is determined that the mobile terminal has moved to an adjacent small cell based on the information indicating the boundary of the small cell received when entering the theme park and the position information (GPS information) of the terminal itself, and Base station 10 of a small cell adjacent to
, The service information in the adjacent small cell can be obtained. The receiving base station 10 may be switched manually.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a system according to an embodiment of the present invention.

FIG. 2 is a timing chart of an embodiment in which free service information and pay service information are simultaneously broadcast using a TDMA cellular telephone.

FIG. 3 is a diagram showing a configuration of an embodiment for providing service information to mobile terminals on an expressway.

FIG. 4 is a diagram showing a configuration of an embodiment for providing service information to mobile terminals in a theme park.

[Explanation of symbols]

 10 base station, 20 terminal, 30 network.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04M 3/42 H04L 11/18 H04Q 7/04 DF term (reference) 5J104 AA16 BA03 BA06 EA04 EA16 NA02 PA02 5K024 AA71 CC11 5K067 AA13 AA22 BB04 CC04 DD20 EE04 EE10 JJ11

Claims (4)

[Claims] 1. A base station allocates a specific channel among access channels used for wireless communication with a terminal for service information and performs broadcasting, and the terminal receives a broadcast signal and provides a service of the specific channel. A service information providing method characterized by acquiring information. 2. The method according to claim 2, wherein the base station encrypts and broadcasts the service information of the specific channel, and only a terminal having a key for decrypting the broadcast acquires the service information of the specific channel. The service information providing method according to claim 1. 3. A base station used in the service information providing method according to claim 1 or 2, wherein a specific channel among access channels used for wireless communication with a terminal is allocated for service information and broadcast is performed. Bureau. 4. A terminal used in the service information providing method according to claim 1 or 2, wherein the terminal receives information transmitted from the base station and obtains service information assigned to the specific channel. Terminal configured for.