Mobile communication terminal and data transmission method

A mobile communication terminal, wherein a battery is used as a power source, comprising:

• a detector for detecting the voltage of the battery acting as a power source;
• decision means for deciding a difference relationship between a voltage level detected by the detector and a prescribed value;
• a transmission reservation controller for ceasing the transmission operation, when the decision means decides that the detected voltage level is less than the prescribed value, during radio transmission of transmission data, storing the transmission data as transmission-reserved data into a storage, and then changing the mobile communication terminal to a wait state;
• and
• a re-transmission controller for radio-transmitting again the transmission-reserved data to be stored in the storage when the decision means decides that the detected voltage level exceeds the prescribed value after a change to the wait state.

A data transmission method suitable for a mobile communication terminal which uses a battery as a power source, comprising the steps of:

• detecting the voltage of the battery acting as a power source;
• deciding a difference relationship between a voltage level detected in the detecting step and a prescribed value;
• storing transmission data as transmission-reserved data into a storage, without starting the transmission operation, when it is decided in the deciding step that the detected voltage level is less than the prescribed value, in response to a data transmission request, and then maintaining its wait state;
• and
• radio-transmitting the transmission-reserved data to be stored in the storage when it is decided in the deciding step that the detected voltage level exceeds the prescribed value after maintenance of the wait state.

A data transmission method suitable for a mobile communication terminal which uses a battery acting as a power source, comprising the steps of:

• detecting the voltage of the battery acting as a power source;
• deciding a difference relationship between a voltage level detected by the detector and a prescribed value;
• ceasing the transmission operation when it is decided in the detecting step that the detected voltage level is less than the prescribed value, during radio transmission of transmission data, storing the transmission data as transmission-reserved data into a storage, and thus changing the mobile communication terminal to a wait state;
• and
• radio-transmitting again the transmission-reserved data to be stored in the storage when it is decided in the deciding step that the detected voltage level exceeds the prescribed value after a change to the wait state.