Transmitter device having means for automatically transmitting data remaining therein upon its re-activation

• US 20030104847A1
• Filed: 09/30/2002
• Published: 06/05/2003
• Est. Priority Date: 11/30/2001
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Harada, Takashi, Maruyama, Terutaka, Sasaki, Akihiro
• Granted Patent: US 6,959,181 B2
• Time in Patent Office: Days
• US Class Current: 455/572
• CPC Class Codes: H04L 1/1874 Buffer management

Abstract

Data formulated according to a user'"'"'s request signal is transmitted from a transmitter device to a receiver device under a wireless or a wired system. The transmitter device includes a transmission controller that formulates the data to be transmitted and memorizes the request signal as a backup signal. If the data transmission is not completed due to a power source trouble such as a voltage drop, the data to be transmitted is automatically formulated again based on the backup signal and sent out to the receiver. If the data transmission is successful, the backup signal is eliminated from a memory. Thus, the data requested by the user is transmitted without fail even if the transmitter becomes temporarily inoperative.

Claims

1. A transmitter device comprising:

a power source for activating the transmitter device;

input means for inputting a request signal;

first control means formulating data to be transmitted based on the request signal, the first control means including a memory device which is able to memorize the request signal therein as a backup request signal even when a power source becomes unable to activate the transmitter device, the first control means eliminating the backup signal from the memory device upon completion of transmission of the data;

second control means for formulating the data to be transmitted based on the backup request signal upon reactivation of the transmitter device if the backup request signal is still memorized in the memory device; and

means for transmitting the data formulated in the first control means and in the second control means.

2. The transmitter device as in claim 1, wherein:

the first control means memorizes only a newest request signal as the backup request signal in the memory device if a plurality of request signals are sequentially inputted.

3. The transmitter device as in claim 2, wherein:

the second control means detects whether a new request signal is being inputted from the input means upon reactivation of the transmitter device; and

the second control means formulates the data to be transmitted based on the new request signal if the new request signal is being inputted, and formulates the data to be transmitted based on the backup request signal if the new request signal is not being inputted and if the backup request signal is memorized in the memory device.

4. The transmitter device as in claim 3, wherein:

under a situation where the second control means formulates the data to be transmitted based on the backup request signal, the second control means memorizes the number of times the data have been formulated based on the same backup request signal without completing transmission of such data, and decides not to repeat formulation of such data if the number of times exceeds a predetermined number of times and eliminates such backup request signal from the memory device.

5. The transmitter device as in claim 3, wherein:

under a situation where the second control means formulates the data to be transmitted based on the backup request signal, the second control means memorizes a period of time lapsed from a previous formulation of the data to be transmitted based on the same backup request signal without completing transmission of such data, and decides not to formulate such data if the period of time exceeds a predetermined period of time and eliminates such backup request signal from the memory device.

6. A method of transmitting data from a transmitter to a receiver, the method comprising steps of:

inputting a request signal to the transmitter;

formulating data to be transmitted based on the request signal;

memorizing the request signal as a backup request signal;

transmitting the formulated data to the receiver;

eliminating the backup request signal if transmission of the data is completed;

formulating data to be transmitted, upon reactivation of the transmitter, based on the backup request signal if the backup request signal is still memorized; and

transmitting the data formulated based on the backup request signal to the receiver.