Portable terminal to control communication based on residual battery capacity

A portable terminal comprising:

• a battery;
• a communication device supplied with drive power from said battery, to perform a communication operation;
• residual battery capacity detection means for detecting, during said communication operation by said communication device, a current residual battery capacity of said battery as available power;
• function suppressing means for suppressing or reducing functions of a group of parts irrelevant to said communication operation for a power-down state when a judging means inhibits start of said communication operation, for calculating a first forecasting power amount necessary for communication from a current consumption in said power-down state, for comparing the current residual battery capacity after power-down detected by said residual battery capacity detecting means and said first forecasting power amount, for causing said communication device to start said communication operation when the current residual battery capacity is above said first forecasting power amount, and for setting redial information and then storing said communication control information and said communication data in a non-volatile memory to alarm shortage of the current residual battery capacity;
• and
• communication resuming means for calculating a second forecasting power amount necessary for communication from the amount of communication data stored in the memory when said redial information is recognized upon a power-on, for comparing the current residual amount of battery capacity detected by said residual battery capacity detecting means and said second forecasting power amount, and for resuming and normally ending a communication operation by reading out the communication control information and the remaining communication data stored in said non-volatile memory when the current residual battery capacity is above said second forecasting power amount.

A method of controlling a communication of a portable terminal based on residual battery capacity, comprising:

• receiving a communication request including communication control information and communication data;
• detecting a residual battery capacity as a power amount as currently available power by a battery;
• calculating a first forecasting power amount necessary for communication from an amount of said communication data of said communication request;
• comparing said present residual battery capacity and said first forecasting power amount and starting a communication operation when said residual battery capacity exceeds said first forecasting power amount;
• inhibiting a start of the communication operation in said comparing step when said residual battery capacity is equal to or less than said first forecasting power amount;
• stopping or deteriorating a function of a portion which is not concerned with the communication operation when the start of the communication operation inhibited, thereby performing a power-down state;
• calculating a second forecasting power amount necessary for the communication from a current consumption in said power-down state;
• comparing the present residual battery capacity and said second forecasting power amount and starting the communication operation when said residual battery capacity exceeds said second forecasting power amount;
• storing, after setting redial information, said communication control information and said communication data into a non-volatile memory and alarming a lack of residual battery capacity when said residual battery capacity is equal to or less than said second forecasting power amount;
• calculating a third forecasting power amount necessary for the communication from the amount of said communication data stored in said non-volatile memory when recognizing redial information upon power-on through replacement of the battery with a charged battery during power-off after said alarming;
• comparing said present residual battery capacity and said third forecasting power amount;
• and
• when said residual battery capacity exceeds said third forecasting power amount, reading out said communication control information and remaining communication data stored in said non-volatile memory, starting the communication operation, and normally finishing said communication operation.

A method of controlling a communication of a portable terminal based on a residual battery capacity during a communication, comprising:

• detecting a present residual battery capacity as a power amount as currently available power by a battery during the communication of communication data based on communication control information given by a communication request;
• calculating a first forecasting power amount necessary for the communication from an amount of residual data to be communicated during the communication;
• comparing said present residual battery capacity and said first forecasting power amount and continuing a communication operation when said residual battery capacity exceeds said first forecasting power amount;
• interrupting the communication operation when said present residual battery capacity is equal to or less than said first forecasting power amount;
• stopping or deteriorating a function of a portion which is not concerned with the communication operation when the communication operation is interrupted, thereby performing a power-down state;
• calculating a second forecasting power amount necessary for the communication from a current consumption in said power-down state;
• comparing the present residual battery capacity and said second forecasting power amount and restarting the communication operation when said residual battery capacity exceeds said second forecasting power amount;
• storing said communication control information and said communication data in a non-volatile memory and alarming a lack of residual battery capacity when said present residual battery capacity is equal to or less than said second forecasting power amount;
• storing, after setting redial information, said communication control information and said remaining communication data stored in said non-volatile memory, and alarming a lack of present residual battery capacity when said present residual battery capacity is equal to or less than said second forecasting power amount;
• calculating a third forecasting power amount necessary for the communication data stored in said non-volatile memory when recognizing said redial information upon power-on through replacement of the battery with a charged battery during power-off after said alarming;
• comparing said present battery capacity and said third forecasting power amount;
• and
• when said present residual battery capacity exceeds said third forecasting power amount, reading out said communication control information and the remaining communication data stored in said non-volatile memory, starting the communication operation, and normally finishing said communication operation.