Mobile telephone or WLL subscriber terminal with accounting function and method for controlling the same

A mobile telephone with an accounting function, operating in conjunction with cell sites and mobile telephone switching offices (MTSOs), comprising:

• a receiver for receiving a call success message from a mobile telephone switching office;
• a controller for calculating a real time call charge at a predetermined time interval beginning at a time when the call success message is received, and adding a call charge for a current call to a call charge for a previous call upon completion of the current call so as to calculate a real time total call charge for a specified user;
• a display unit for displaying the real time total call charge according to call charge data from the controller;
• and
• a memory for storing the call charge data output from the controller a clear button, when pressed, initializing both the call charge and the personal call charge;
• and initializing only the current call charge when the clear button is not pressed.

A method for calculating a real time call charge of a mobile telephone operating in conjunction with cell sites and mobile telephone switching offices (MTSOs) for transmitting a call success message to an originating party upon receipt of an acknowledge signal from a call receiving party, comprising the steps of:

• a) checking whether the call success message is received from the mobile telephone switching office;
• b) starting a call duration counter upon receipt of the call success message;
• c) checking whether it is time to update the call charge;
• d) calculating a charge for the current call up to the present time when it is time to update the call charge, and displaying the calculated real time call charge;
• e) checking whether the call is completed;
• f) repeating steps d)-e) when the call is not completed;
• and
• g) storing the calculated call charge up to the present time in a memory when the call is completed
• h) initializing both the current call charge and the personal call charge when the clear button is pressed;
• and
• I) initializing only the current call charge when the clear button is not pressed.

A method for calculating a real time call charge of a mobile telephone operating in conjunction with cell sites and mobile telephone switching offices (MTSOs) for transmitting a call success message to a call originating party upon receipt of an acknowledge signal from a call receiving party, comprising the steps of:

• a) checking whether the call success message is received from the mobile telephone switching office, after a telephone number for the call receiving party has been dialed;
• b) starting a call duration counter upon receipt of the call success message, and checking whether it is time to update the call charge;
• c) if it is time to update the call charge, calculating a charge for the current call up to the present, adding the calculated call charge to a last call charge to calculate a personal call charge, and displaying the calculated real time call charge;
• d) checking whether the call is completed, and storing the call charge calculated up to the present in memory when the call is completed;
• e) repeating step c) if the call is not complete;
• f) checking whether a clear button is pressed;
• g) initializing both the current call charge and the personal call charge when the clear button is pressed;
• and
• h) initializing only the current call charge when the clear button is not pressed.

A wireless local loop (WLL) subscriber terminal with an accounting function, operating in conjunction with cell sites and WLL subscriber terminal switching offices for transmitting a call success message to a call originating party upon receipt of an acknowledge signal as to a specific call from a call receiving party, comprising:

• a receiver for receiving a call success message from the WLL subscriber terminal switching offices;
• a display unit for visually displaying a real time call charge according to call charge data;
• a memory for storing said real time call charge;
• user interface means for inputting charge rate data;
• and
• a controller for calculating the real time call charge at a predetermined time interval beginning at a time when the call success message is received, storing input charge rate data in the memory and calculating the real time call charge based on the input charge rate data and providing the real time call charge data to the display unit a clear button, when pressed, initializing both the call charge and the personal call charge;
• and initializing only the current call charge when the clear button is not pressed.

A method for calculating a real time call charge of a WLL subscriber terminal operating in conjunction with cell sites and WLL subscriber terminal switching offices (MTSOs) for transmitting a call success message to a call originating party upon receipt of an acknowledge signal from a call receiving party, comprising the steps of:

• a) checking whether the call success message is received from the WLL subscriber terminal switching office, after a telephone number for the call receiving party has been dialed by the WLL subscriber terminal;
• b) starting a call duration counter upon receipt of the call success message, and checking whether it is time to update the call charge;
• c) if it is time to update the real time call charge, calculating a charge for the current call up to the present, and adding the calculated real time call charge to a call charge accumulated up to the present to display the call charge;
• d) checking whether the call is completed after displaying the real time call charge, and storing the real time call charge calculated up to the present in a memory when the call is completed;
• e) repeating step c) if the call is not complete;
• f) checking whether a clear button is pressed after storing the calculated real time call charge;
• g) initializing both the current call charge and a personal call charge when the clear button is pressed;
• and
• h) initializing only the current call charge when the clear button is not pressed.