Information broadcasting system having reception error minimizing facility
First Claim
1. An information broadcasting system, comprising:
- a center office for providing information selectively read out from an information source storing various types of information;
a plurality of terminal equipment units for simultaneously receiving the same said information provided from the center office through a network in a point-to-multipoint configuration,first means, which is provided in the center office, for repeatedly transmitting to the terminal equipment units, information with an added error check code, without interposition of a protocol for confirming if said information had been provided normally to the terminal equipment units via respective calls set up in said network for each of said terminal equipment units; and
second means, provided in each of the terminal equipment units, for receiving said information from said center office via the corresponding said call set up in said network and ending reception of said information after confirming, using said error check code, that the information has been normally received at the terminal equipment units without the interposition of a protocol for confirming if said information provided from the center office was received normally and promptly disconnecting the corresponding call with said center.
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Accused Products
Abstract
Information selectively read out from an information source storing various types of information is repeatedly sent from a center office to a number of terminal equipment units with an error check code added on. The terminal equipment units use the error check code to detect if there is an error in the received information. If the information is received without error, the reception operation is ended for each terminal equipment unit. In this case, there is no interposition of a protocol for confirming if the transmission and reception of the information had been performed normally, so the load on the center office is lightened and it is possible for each of the terminal equipment units to receive the information without error.
40 Citations
21 Claims
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1. An information broadcasting system, comprising:
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a center office for providing information selectively read out from an information source storing various types of information; a plurality of terminal equipment units for simultaneously receiving the same said information provided from the center office through a network in a point-to-multipoint configuration, first means, which is provided in the center office, for repeatedly transmitting to the terminal equipment units, information with an added error check code, without interposition of a protocol for confirming if said information had been provided normally to the terminal equipment units via respective calls set up in said network for each of said terminal equipment units; and second means, provided in each of the terminal equipment units, for receiving said information from said center office via the corresponding said call set up in said network and ending reception of said information after confirming, using said error check code, that the information has been normally received at the terminal equipment units without the interposition of a protocol for confirming if said information provided from the center office was received normally and promptly disconnecting the corresponding call with said center.
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2. An information broadcasting system, comprising:
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a center office for providing information selectively read out from an information source storing various types of information; a plurality of terminal equipment units for simultaneously receiving the same said information provided from the center office through a network in a point-to-multipoint configuration, first means, which is provided in the center office, for repeatedly transmitting to the terminal equipment units, information with an added error check code, without interposition of a protocol for confirming if said information had been provided normally to the terminal equipment units via respective calls set up in said network for each of said terminal equipment units; and second means, provided in each of the terminal equipment units, for receiving said information from said center office via the corresponding said call set up in said network and ending reception of said information after confirming, using said error check code, that the information has been normally received at the terminal equipment units without the interposition of a protocol for confirming if said information provided from the center office was received normally, said first means successively reads said information with the added error check code, repeatedly transmits said information read a predetermined number of times, and stops transmitting said information when said information has been transmitted the predetermined number of times and promptly disconnecting the corresponding call with said center office said second means detects whether the information received includes an error, discards said information when said error is detected and receives next transmitted information. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. An information broadcasting system, comprising:
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a center office for providing information selectively read out from an information source storing various types of information; a plurality of terminal equipment units for simultaneously receiving the same said information provided from the center office through a network in a point-to-multipoint configuration, first means, which is provided in the center office, for repeatedly transmitting to the terminal equipment units, information with an added error check code, without interposition of a protocol for confirming if said information had been provided normally to the terminal equipment units via respective calls set up in said network for each of said terminal equipment units; and second means, provided in each of the terminal equipment units, for receiving said information from said center office via the network and ending reception of said information after confirming, using said error check code, that the information has been normally received at the terminal equipment units without the interposition of a protocol for confirming if said information provided from the center office was received normally, said second means comprising; an error detecting unit which uses said added error check code to detect if said information has been normally received, and a call control unit which controls a setup of a call to be connected with the center office and which issues a call disconnect request to the call control unit when the error detecting unit indicates that said information has been normally received, so that the call connected with the center office is disconnected. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An information broadcasting system, comprising:
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read-out-means for providing information selectively read out from an information source storing various types of information at a central office; repeatedly transmitting means for repeatedly transmitting a predetermined number of times, to terminal equipment units; error check code adding means for transmitting said information including an added error check code via respective calls set up in a network for each destination terminal equipment unit allowing retransmission to stop as soon as normal reception of all packets is confirmed.
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18. An information broadcasting system, comprising:
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read-out-means for providing information selectively read out from an information source storing various types of information at a central office; repeatedly transmitting means for repeatedly transmitting, a predetermined number of times, to terminal equipment units; error check code adding means for transmitting said information including an added error check code via respective calls set up in a network for each destination terminal equipment unit until all of said terminal equipment units have received said information without a reception error. - View Dependent Claims (19, 20)
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21. An information broadcasting system comprising:
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a network including nodes; a center office for providing information; and a plurality of terminal equipment units, said nodes coupled between the center office and the plurality of terminal equipment units, and said nodes including lower nodes located at a terminal equipment unit side and higher nodes located at a center office side, said plurality of terminal equipment units receiving information repeatedly transmitted from said center office and transferring call disconnect signals based on a call disconnect request issued when the information has been normally received, each of said call disconnect signals corresponding to a terminal equipment unit of said plurality of terminal equipment units, said nodes receiving said call disconnect signals successively from the lower nodes and sending said call disconnect signals to the higher nodes when the terminal, said corresponding call disconnect signal received successively from a corresponding lower node and sending said corresponding call disconnect signal to a corresponding higher node when a corresponding terminal equipment unit coupled to the corresponding lower node outputs said corresponding call disconnect signal.
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Specification