Communication terminal device for avoiding inoperative state caused by excessive power consumption and communication control method therefore

1. A communication control method for a communication terminal device including a plurality of communication units corresponding to different communication schemes or communication systems to perform communication in parallel, the method comprising:

when a first communication unit performs transmission, stopping transmission/reception of another communication unit;

setting a transmission/reception stop duration of the another communication unit to be equal to or less than a predetermined number of synchronization protection stages;

determining a presence or absence of a transmission stop frame of the another communication unit;

calculating an estimated frame error rate of the another communication unit;

comparing the estimated frame error rate with a predetermined value; and

prohibiting a transmission/reception stop of the another communication unit when the estimated frame error rate exceeds the predetermined value.

2. A communication control method for a communication terminal device including a plurality of communication units corresponding to different communication schemes or communication systems to perform communication in parallel, the method comprising:

when a first communication unit performs transmission, stopping transmission/reception of another communication unit;

setting a transmission/reception stop duration of the another communication unit to be equal to or less than a predetermined number of synchronization protection stages;

determining that the another communication unit is in an intermittent transmission/reception state in a standby state;

prohibiting the transmission/reception stop when the another communication unit starts intermittent transmission/reception; and

permitting the transmission/reception stop again when the another communication unit ends the intermittent transmission/reception.

3. A communication control method for a communication terminal device including a plurality of communication units corresponding to different communication schemes or communication systems to perform communication in parallel, the method comprising:

when a first communication unit performs transmission, stopping transmission/reception of another communication unit;

setting a transmission/reception stop duration of the another communication unit to be equal to or less than a predetermined number of synchronization protection stages;

transmitting radio waves by the plurality of communication units;

performing conversion from a radio frequency signal into a baseband signal, or conversion from a baseband signal into a radio frequency signal;

performing a baseband demodulation process or a data decoding process;

performing a data encoding process for transmitting data to network;

separating control data and user data in data communication with an outside;

turning transmission/reception ON/OFF by a control signal from the outside; and

outputting a communication unit OFF prohibition signal to the outside.

4. The communication terminal device comprising a plurality of communication units corresponding to different communication schemes or communication systems and a control unit,

wherein each of the communication units includes an antenna unit, a radio unit, a baseband unit, an external interface unit, and a communication control unit, and

wherein the communication terminal device operates in the communication control method of the communication terminal device according to claim 1 .

5. The communication terminal device comprising a plurality of communication units corresponding to different communication schemes or communication systems and a control unit,

wherein each of the communication units includes an antenna unit, a radio unit, a baseband unit, an external interface unit, and a communication control unit, and

wherein the communication terminal device operates in the communication control method of the communication terminal device according to claim 2 .

6. The communication terminal device comprising a plurality of communication units corresponding to different communication schemes or communication systems and a control unit,

wherein each of the communication units includes an antenna unit, a radio unit, a baseband unit, an external interface unit, and a communication control unit, and

wherein the communication terminal device operates in the communication control method of the communication terminal device according to claim 3 .