Wireless local loop system using CDMA method

A wireless local loop (WLL) system using a code division multiple access (CDMA) method, comprising:

• a data buffer that temporarily stores therein a data signal from a public switched packet data network (PSPDN);
• a CDMA modulator that respectively modulates a voice signal from a public switched telephone network (PSTN) and a data signal from the data buffer to a code signal for a data purpose channel and a voice purpose channel, which are separately assigned;
• a radio frequency (RF) transmitter that up-converts the modulated code signal, amplifies the up-converted signal to a predetermined transmission power, and transmits the amplified signal through a transmission antenna into free space;
• and
• a microprocessor that controls the transmission power of the RF transmitter in accordance with a state of the data buffer, wherein the microprocessor interrupts the power transmission of the RF transmitter when there is no data for transmission in the data transmission buffer.

A data transmission/reception method in a wireless local loop (WLL) system using a code division multiple access (CDMA) method, comprising:

• assigning separately a plurality of transmission channels as a data purpose channel for data communication subscribers and voice purpose channels for general telephone subscribers;
• performing a voice communication through the assigned voice purpose channels by a circuit switching method during a transmission/reception of a voice signal;
• performing a data communication in common through the assigned data purposed channel by a packet switching method during the transmission/reception of a data signal;
• storing the data to be transmitted temporarily in a data transmission buffer;
• checking whether there exists a transmission data by monitoring the data transmission buffer;
• controlling a transmission power to “0” when there is no data for transmission;
• and
• controlling the transmission power to a preset appropriate transmission power level when there is data for transmission.

A method comprising:

• monitoring status of a buffer;
• and
• controlling transmission power of an antenna according to the status of the buffer, wherein:
• said monitoring the status of the buffer comprises determining if data is stored in the buffer, and
• if it is determined that data is not stored in the buffer, then controlling the transmission power of the antenna to be substantially zero.

An apparatus configured to:

• monitor status of a buffer;
• control transmission power of an antenna according to the status of the buffer, wherein:
• said monitoring of the status of the buffer comprises determining if data is stored in the buffer, and
• if it is determined that data is not stored in the buffer, then controlling the transmission power of the antenna to be substantially zero.