JP2000299887A - Broadcast system to radio terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously apply teletext broadcasting to many unspecified radio terminal in a form of a short message without assigning communication channels to a control frequency. SOLUTION: A short message stored in a memory area 2 in a business establishment is sent to a radio base station 3 via an exchange section 1. The radio base station 3 uses a transmission timing generating section to generate a transmission timing of a transfer control channel. A reception section retrieves an idle channel to decide the timing. Then a transmission interval of the transfer control channel is decided and the short message is coded in a user service channel USCCH and is broadcast to many radio terminals 4 in the business establishment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast system for wireless terminals, and more particularly to a PHS (Personal Handy Ph.) Connected via a PBX and a wireless base station.
The present invention relates to a broadcast system for receiving a short message broadcast by using a wireless terminal such as one system as an office digital cordless telephone.

[0002]

2. Description of the Related Art Conventionally, a short message service has
After establishing a communication channel by a link channel service between the wireless base station and the wireless terminal, characters are transmitted and received on the communication channel as a predetermined fixed shift.
Here, the number of bytes of the short message is not particularly defined in the communication protocol, but refers to a message short enough to be displayed on a terminal such as a PHS.

[0003] Between a wireless base station and a wireless terminal, a link channel is shifted to a communication channel from the establishment of a link channel.
l) Channel (FACC), SAC (short a
access channel) (SACC)
The channel adds character information as a fixed shift to an INFO (information) message, which is a communication (CC) message, and transmits the character information to a specific wireless terminal. Here, FACC, SA
CC, CC, INFO, etc.
& Development Center Center f
orRadioSystem: Radio System Development Center)-STD28 is defined in the third edition.

In a cellular mobile radio network having a call setup function including a short message, a technique of listing broadcasts on a broadcast control channel specific to a transfer cell in a common channel is disclosed in, for example, Japanese Patent Laid-Open No. 8-280054. No. 6,098,045 ("Device for permitting cell selection in a terminal of a cellular mobile radio network in a standby state").

As shown in FIG. 5, according to the above publication, a transmission quality parameter relating to a cell is calculated in a parameter calculation unit 130 in order to allow a terminal of the cellular mobile radio network in a standby state to select a cell. If the parameter has a sufficient value with respect to the first threshold, call setup is permitted via the detection means 160. If the transmission quality parameter does not have a sufficient value for the first threshold value but has a sufficient value for the second threshold value, a part of the call setup function or Allow all. here,
The detecting means 210 instructs the means 80 to listen to the common channel including the paging channel by the second control signal S '.
2 and this second control signal S′2 is broadcast by means 210 on the sibling control channel of the cell selected.

[0006]

However, in message transmission using a communication channel, if the same information is to be simultaneously notified to a large number of terminals, the number of communication channels required is the same as the number of terminals to be notified. However, for example, in the PHS protocol, the number of channels that can be broadcast simultaneously by one radio base station is limited to four.

Accordingly, an object of the present invention is to simultaneously broadcast short messages to a large number of four or more wireless terminals without allocating a communication channel in one business office.

[0008]

According to the present invention, there is provided a wireless terminal, a message broadcast memory for storing a message to the wireless terminal, and an exchange in an office for transmitting the message. A broadcast system to a wireless terminal including a wireless base station for transmitting the transmitted message to the wireless terminal, wherein the message and a transfer control signal are transferred over a control channel of a cordless telephone for business use.

[0009] That is, in the present invention, in the exchange in the office, a short message is transmitted to the radio base station once. Then, the radio base station receiving the short message transmits a broadcast control channel (BCCH) signal and a user service channel (USCC) encoding the short message using the transfer control channel.
H) Transmit the signal.

[0010] Further, the radio terminal in the business establishment receives the broadcast control channel (BCCH) signal, judges whether or not there is a short message, and when it detects that the short message is sent, the user terminal of the user service channel. Wait for (USCCH) signal.

As described above, in the present invention, a short message is transmitted from a radio base station to an unrelated terminal using a transfer control channel.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a system for broadcasting to a wireless terminal according to the present invention. As shown in FIG. 1, a short message broadcast memory 2 is connected to an exchange unit 1 of a business cordless telephone system.

The information in the short message broadcast memory 2 is transmitted to a plurality of wireless base stations 3 via the switching unit 1, received by a plurality of wireless terminals 4, and displayed on the wireless terminals 4.

FIG. 2 is a block diagram of the radio base station 3. As shown in FIG. 2, the short message from the switching unit 1 in the premises is received by the switching unit interface 50 of the wireless base station 3 via an ISDN line or the like.

Then, the short message is transmitted to the transmission data generator 40 by the user service channel USC.
It is converted to the data format of CH. The converted data is
The data is transmitted to the radio unit 10 via the transmission unit 20 and transmitted to the radio section.

When transmitting to the radio unit 10, the receiving unit 6
0 searches for a free channel, and the transmission timing generator 30 generates a transmission timing based on the search result.

The transmission timing generation unit 30 uses the generated transmission timing to set a broadcast channel BCCH, a user service channel USCCH,
Service channel SCCH, paging channel P
A logic channel such as CH is transmitted. Here, the service channel SCCH and the paging channel PC
H is a signal for using a communication channel, and a broadcast channel BCCH and a user service channel USCCH are signals for performing a short message broadcast of the present invention.

FIG. 3 is a block diagram of the wireless terminal 4.
As shown in FIG. 3, after the short message is received by the receiving unit 25 via the wireless unit 15, the received data generating unit 45 outputs the user service channel USCCH.
The format is decoded, and the short message is displayed on the data display unit 46.

When receiving the broadcast channel BCCH, the radio terminal 4 confirms the presence / absence of a short message broadcast based on the broadcast information and the optional broadcast information included in the BCCH.

Further, a user instructs permission / non-permission of short message broadcast reception on the operation unit 55 to perform battery saving.

FIG. 4 is a time chart showing an example of a signal transmitted from the radio base station to the radio terminal on the transfer control channel. In FIG. 4, the wireless terminal first receives a broadcast control signal BCCH. When the user wants to receive the short message, the mobile station waits for the USCCH transmitted following the BCCH, decodes the USCCH, and displays the short message on the display of the cashless terminal.

On the other hand, if it is not desired to receive a short message, a signal on a communication channel may be received based on the reception of the SCH or PCH.

[0024]

According to the present invention described above, since a short message is broadcast using a transfer control channel, character information can be simultaneously provided to a large number of wireless terminals.

Further, according to the present invention, since character information is transmitted on the transfer control channel, there is no need to allocate a communication channel, and the communication frequency can be used effectively.

[Brief description of the drawings]

FIG. 1 is a block diagram of a broadcast system for a cashless terminal according to the present invention;

FIG. 2 is a block diagram of a base station.

FIG. 3 is a block diagram of a wireless terminal.

FIG. 4 is a time chart of an example of a short message broadcast signal on a transfer control channel;

FIG. 5 is a block diagram of a terminal of a conventional cellular mobile radio network.

[Explanation of symbols]

 Reference Signs List 1 exchange unit 2 message broadcast memory 3 radio base station 4 radio terminal 10, 15 radio unit 20 transmission unit 25, 60 reception unit 30 transmission timing generation unit 35 reception timing generation unit 40 transmission data generation unit 45 reception data generation unit 46 data display Section 50 Switching section interface 55 Operation section BC (BCCH) Broadcast control channel US (USCCH) User service channel SC (SCH) Service channel P (PCH) Paging channel

Claims (5)

[Claims] 1. A wireless terminal includes: a wireless terminal; a message broadcast memory for storing a message to the wireless terminal; an exchange in an office for transmitting the message; and a wireless base station for transmitting the message to the wireless terminal. A system for broadcasting to a wireless terminal, wherein the wireless base station transfers the message and a transfer control signal on a transfer control channel of a cordless telephone for business use. 2. The radio base station according to claim 1, further comprising: a transmission data generator for encoding the message and the transfer control signal; and a transmission timing generator for determining a timing for transmitting the encoded signal. The broadcast system for a wireless terminal according to claim 1. 3. The wireless terminal comprises: a reception data generation unit for decoding the message; and a reception timing generation unit for detecting a phase of the transfer control signal, wherein the timing generation is performed based on the encoded signal. 2. The broadcast system to a wireless terminal according to claim 1, further comprising: instructing a unit to wait for reception; and displaying an output of the reception data generation unit based on an output of the timing generation unit. 4. The broadcast system for a wireless terminal according to claim 3, wherein the wireless terminal includes an operation unit for setting whether to display the message. 5. The broadcast system for a wireless terminal according to claim 4, wherein the operation unit instructs the reception timing generation unit whether to wait for reception.