Method and apparatus for radio packet data transmission

A communication terminal, comprising:

• an IF/RF unit that changes a radio frequency signal of received data into a received baseband signal and that changes a baseband signal of transmit data to a radio frequency signal for transmission within a packet;
• a receive unit detects a data signal from the received baseband signal outputted by the IF/RF unit;
• a data matching unit that receives the data signal from the receive unit and matches data communicated between the communication terminal and an outer processing device;
• an error detecting unit that checks for an error signal in the received baseband signal inputted to the receive unit and generates a corresponding error controlling signal;
• and
• a sending unit that outputs the transmit data, which is received from the data matching unit, to the IF/RF unit based on the corresponding error controlling signal.

A method of data transmission, comprising:

• communicating data within a packet frame unit from a terminal to a base station;
• transmitting a channel occupying signal from the base station to the terminal when data transmission from the terminal is perceived by the base station;
• continuing the communication of the packet data, while the channel occupying signal is active;
• identifying whether the base station receives the communicated packet data;
• and
• ending a process for communicating the packet data if the base station receives the communicated packet data.

A communication terminal, comprising:

• a variable power transmission means for communicating transmit data;
• a receiving means for communicating received data;
• and
• a signal detection means for detecting a busy signal and an idle signal within the received data, wherein
• the signal detection means controls the variable power transmission means' power output, transmission timing, and ability to complete a communication of the transmit data, in response to the detected busy and idle signals.

A communication terminal, comprising:

• a transmission means for communicating transmit data;
• a receiving means for communicating received data;
• and
• a signal detection means for detecting a quality of the received data and generating a busy signal and an idle signal in response to the detected quality of the received data, wherein
• the transmission means communicates the idle signal in the transmit data when the detected quality of the received data is below a first threshold value,
• the transmission means communicates the busy signal in the transmit data when the detected quality of the received data is equal to or above the first threshold value, and
• the transmission means communicates the idle signal in the transmit data when the detected quality of the received data is above a second threshold value and the communication of the transmit data is completed.

A communication system, comprising:

• a variable power transmission means for communicating transmit data from a first terminal to a second terminal;
• a receiving means for communicating receive data from the second terminal to the first terminal;
• and
• a signal detection means for detecting a busy signal and an idle signal within the receive data, wherein
• the signal detection means controls the variable power transmission means' power output, transmission timing, and ability to complete a communication of the transmit data in response to the busy and idle signals generated by the second terminal and detected by the first terminal.

A communication method, comprising:

• communicating transmit data from a first terminal to a second terminal;
• communicating receive data from the second terminal to the first terminal;
• detecting a busy signal and an idle signal within the receive data;
• and
• controlling a power output, a transmission timing, and an ability to complete the communication of the transmit data in response to the busy and idle signals generated by the second terminal and detected by the first terminal.