Portable terminal to control communication based on residual battery capacity

• US 5,845,142 A
• Filed: 08/29/1997
• Issued: 12/01/1998
• Est. Priority Date: 08/21/1992
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hayasaka, Hisashi
• Primary Examiner(s): Ray, Gopal C.
• Application Number:
  US08/921,337
• Time in Patent Office: 459 Days
• Field of Search: 395/750.08, 395/750.06, 395/750.03, 364/707, 364/492
• US Class Current: 713/340
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

In data communication with power furnished from a built-in battery, the residual battery capacity is detected as power that can be currently supplied by the battery. In addition, power necessary for communication is forecast from the quantity of data for communication. The currently residual battery capacity and the necessary power for communication are compared. If the former is in excess of the latter, the communication operation is allowed, while otherwise it is inhibited. When the communication operation is inhibited, functions of parts irrelevant to communication operation are suppressed or reduced. When function suppression is done, the necessary power for communication is re-forecast for comparison from current consumed by other parts than those functions suppressed or reduced.

Claims

1. 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 a current residual battery capacity of said battery as available power;

judging means for calculating a first forecasting power amount necessary for the communication operation, upon receipt of a communication request including communication control information and communication data, from an amount of said communication data, for comparing the thus calculated first forecasting power amount and said current residual battery capacity detected by said residual battery capacity detection means, for starting said communication operation if said current residual battery capacity is above said first forecasting power amount, and for inhibiting start of said communication operation of said communication device if said current residual battery capacity is equal to or less than said first forecasting power amount;

function suppressing means for suppressing or reducing functions of a group of parts irrelevant to said communication operation for a power-down state when said judging means inhibits start of a group of said communication operation, for calculating a second 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 second forecasting power amount, for causing said communication device to start communication operation when the current of residual battery capacity is above said second 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 third forecasting power amount necessary for communication from the amount of communication data stored in the memory when said redial information is recognized upon said power-on, for comparing the current residual amount of battery capacity detected by said residual battery capacity detecting means and said third 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 residual battery capacity is above said third forecasting power amount.

2. The portable terminal according to claim 1, wherein said function suppressing means suppresses or reduces the function of a floppy disk device, a display, and an option slot connector as said group of parts irrelevant to said communication operation.

3. The portable terminal according to claim 1, wherein said function suppressing means includes function suppression display means for displaying said suppressed or reduced functions of said groups of parts.

4. The portable terminal according to claim 1, further comprising alarm means for alarming the inhibition of the operation of said communication device by said judging means.

5. The portable terminal according to claim 1, wherein said residual battery capacity detection means detects the residual battery capacity by subtracting the power consumed by the terminal determined for every predetermined interval of time from the initial residual battery capacity immediately after charging of said battery.

6. The portable terminal according to claim 1, further comprising forecasting means to determine a necessary communication time by dividing the quantity of data for communication by the communication rate and forecasts the necessary power for communication by multiplying said necessary communication time by the power consumed during communication.

7. The portable terminal according to claim 6, further comprising a main CPU and a sub CPU, said main CPU executing functions of said communication device, said sub CPU executing functions of said residual battery capacity detection means, said forecasting means and said judging means.

8. 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.

9. The portable terminal according to claim 8, wherein said function suppressing means includes function suppression display means for displaying said suppressed or reduced functions of said group of parts.

10. The portable terminal according to claim 8, further comprising alarm means for alarming a communication failure when the communication operation of said communication device is interrupted by said judging means.

11. The portable terminal according to claim 8, further comprising forecasting means to determine a necessary communication time by dividing the quantity of data for communication by the communication rate and forecasts the necessary power for communication by multiplying said necessary communication time by the power consumed during communication.

12. The portable terminal according to claim 11, further comprising a main CPU and a sub CPU, said main CPU executing functions of said communication device, said sub CPU executing functions of said residual battery capacity detection means, said forecasting means and said judging means.

13. 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.

14. 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.