Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1999-03-16
2001-07-03
Trost, William G. (Department: 2746)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S434000, C455S458000, C370S336000, C370S349000
Reexamination Certificate
active
06256509
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a broadcast information delivering system, and more specifically to a broadcast information delivering system in which broadcast information is transmitted from a base station of a wireless communication system, and information reserved by a user is automatically collected at the wireless terminals.
(2) Description of the Related Art
In a computer network using a communication circuit, a user sets up an individual bidirectional circuit between a user terminal and a destination apparatus, whereby the user is able to obtain necessary information from a desired information site. For example, if the bidirectional circuit is set up between the user terminal apparatus and an Internet connection apparatus, desired information can be taken out from an arbitrary WEB and displayed on the terminal apparatus.
However, in order to access a desired information provider system in the conventional communication network, each terminal user is required to perform a complicated communication procedure for setting up a communication circuit between the terminal apparatus and the information provider system, and the user takes a considerably long time to obtain desired information. The transmission of information from the information provider system to the terminal apparatus is carried out through a dedicated communication channel established at each user terminal, and accordingly the communication charge to acquire desired information becomes high.
These problems mentioned above become apparent specially in case that a terminal apparatus of a wireless communication system such as a mobile phone or PHS (Personal Handyphone System) accesses the information provider system through a wireless channel.
Here, as an information notification system that broadcasts to an unspecified number of car radios reporting information such as traffic information to present the congestion of a road, for example, the Japanese Unexamined Patent Publication No. Hei 10-22951 has disclosed a system construction, in which a transmitter repeatedly broadcasts by applying the frequency conversion to the reporting information of plural groups each including an ID header for indicating the IDs of the kind of information, information data divided into a plurality of information elements, and EOF, and a receiver stores all the received information groups in a memory, reads out from the memory an information group of a specified ID selected by a user on the operation panel, applies the reverse frequency conversion to the information, and outputs the original information to the speaker, whereby the user is able to obtain the reporting information without relation to the broadcasting hours.
SUMMARY OF THE INVENTION
An object of the invention is to provide a broadcast information delivering system and a wireless communication system that can provide information requested by a user inexpensively with a simple procedure.
Another object of the invention is to provide a broadcast information delivering system and a wireless communication system that can effectively deliver information requested by a user at a mobile station operated by a battery with the least exhaustion of the battery.
Another object of the invention is to provide a broadcast information delivering system and a wireless communication system that a terminal user can refer to desired information at a timing convenient to the user.
Another object of the invention is to provide a broadcast information delivering system and a wireless communication system that is well adapted for charge for charged information.
Another object of the invention is to provide a wireless base station that can effectively deliver information to a plurality of user terminals, and a wireless terminal apparatus that can effectively receive information desired by a user.
In order to accomplish the foregoing objects, the broadcast information delivering system of this invention employs a wireless base station that communicates system control information through at least one control channel and user information through a traffic channel allocated to each of the wireless terminals, with a plurality of wireless terminals.
The wireless base station employed in this invention is characterized by comprising: a control channel transmitter circuit for transmitting to the control channel the system control information, and broadcast control information that defines a transmission condition concerning a broadcast frame; and a broadcast channel transmitter circuit for transmitting the broadcast frame containing broadcast information to be received by unspecified wireless terminals to a specific channel defined by the broadcast control information, in accordance with the transmission condition.
In case of the cellular system using the CDMA (Code Division Multiple Access) technique, for example, a radio channel can be specified by a spreading code used in a spread spectrum of transmission information. A transmission signal having been applied code spreading by a transmitter based on a certain spreading code can be received only when a receiver applies the despreading to the received signal by using the same spreading code. Accordingly, if the wireless base station is able to beforehand inform each of the terminals of channel information such as the spreading code used in a broadcast channel and the transmission rate, all the terminals will be able to receive the transmission information of the broadcast channel.
According to this invention, by transmitting the broadcast control information to the control channel, each of the terminals is informed of the channel information concerning the broadcast channel, so that all the terminals located within a base station cell can receive the broadcast information.
Further, according to this invention, transmission of the broadcast information from the wireless base stations can be realized by utilizing the infrastructure of the existing wireless communication system such as the cellular system, it becomes possible to deliver to the wireless terminals local broadcast information unique to each area, depending upon the covering area of the respective wireless base stations.
According to the present invention, the wireless base station can transmit the broadcast frame having the same contents periodically for a plurality of times, and each of the wireless terminals can receive again at the subsequent broadcast frame the same broadcast information that has been failed in normal receiving at the previous broadcast frame due to transmission errors, resulting in allowing highly reliable information delivery.
Another aspect of the invention resides in that the broadcast control information includes information for indicating a transmission time of the broadcast frame in addition to information for specifying the broadcast channel or a spreading code, and each broadcast frame is comprised of a plurality of sub-frames which contain different broadcast information to each other and a frame header which includes guidance information of the contents of said broadcast information contained in the respective sub-frames. Each of the sub-frames is comprised of, for example, a plurality of information packets each including a sub-frame header and a block of broadcast information.
Each of the wireless terminals for use in the broadcast information delivering system of the present invention is characterized by comprising a control channel receiver circuit for receiving the control information from the control channel, a broadcast channel receiver circuit for receiving the frame header of a broadcast frame from the broadcast channel on the basis of the broadcast control information received by the control channel receiver circuit and selectively receives broadcast information contained in a specific sub-frame of the broadcast frame in accordance with guidance information indicated by the broadcast frame header, a storage for storing the broadcast information received by the broadcast channel receiver circu
Amada Eiichi
Mizutani Seiki
Tanaka Satoshi
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Tran Congvan
Trost William G.
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