Radio base apparatus, transmission power control method, and transmission power control program
AssigneeSanyo Electric Co., Ltd.
InventorSeigo Nakao
Life of this patent
Estimating the term…
Abstract
In a mobile communication system having a plurality of terminals including a diversity terminal, an adaptive array base station controls a down-link transmitting power waveform for a terminal establishing access such that transmitting power is decreased at a timing when a reception level of a chip antenna is measured and that transmitting power is increased at a timing when a reception level of a whip antenna as a transmission antenna is measured. In the diversity terminal, therefore, the whip antenna is more likely to be selected as a receiving antenna, thereby improving down-link reception performance.
Claims21
A radio base apparatus capable of communicating with a diversity terminal apparatus performing selective diversity reception,
- said diversity terminal apparatus having at least first and second antennas, always using said second antenna to transmit an up-link signal to said radio base apparatus, and measuring reception levels at said first antenna at a prescribed first timing and at said second antenna at a prescribed second timing of a down-link signal from said radio base apparatus to use an antenna with a higher reception level to receive a down-link signal from said radio base apparatus,
- said radio base apparatus comprising:
- signal processing means for receiving and transmitting a signal from/to each of said plurality of terminal apparatuses through adaptive array processing;
- and
- transmitting power control means for controlling transmitting power for a terminal apparatus of said plurality of terminal apparatuses which communicates with said radio base apparatus such that transmitting power at said second timing of the down-link signal is larger than transmitting power at said first timing of the down-link signal.
A transmitting power control method of a radio base apparatus capable of communicating with a diversity terminal apparatus performing selective diversity reception,
- said diversity terminal apparatus having at least first and second antennas, always using said second antenna to transmit an up-link signal to said radio base apparatus, and measuring reception levels at said first antenna at a prescribed first timing and at said second antenna at a prescribed second timing of a down-link signal from said radio base apparatus to use an antenna with a higher reception level to receive a down-link signal from said radio base apparatus,
- said transmitting power control method comprising the steps of:
- receiving and transmitting a signal from/to each of said plurality of terminal apparatuses through adaptive array processing;
- and
- controlling transmitting power for a terminal apparatus of said plurality of terminal apparatuses which communicates with said radio base apparatus such that transmitting power at said second timing of the down-link signal is larger than transmitting power at said first timing of the down-link signal.
A transmitting power control program of a radio base apparatus capable of communicating with a diversity terminal apparatus performing selective diversity reception,
- said diversity terminal apparatus having at least first and second antennas, always using said second antenna to transmit an up-link signal to said radio base apparatus, and measuring reception levels at said first antenna at a prescribed first timing and at said second antenna at a prescribed second timing of a down-link signal from said radio base apparatus to use an antenna with a higher reception level to receive a down-link signal from said radio base apparatus, wherein
- said transmitting power control program causes a computer to execute the steps of:
- receiving and transmitting a signal from/to each of said plurality of terminal apparatuses through adaptive array processing;
- and
- controlling transmitting power for a terminal apparatus of said plurality of terminal apparatuses which communicates with said radio base apparatus such that transmitting power at said second timing of the down-link signal is larger than transmitting power at said first timing of the down-link signal.
Dependencies are inferred from the claim text.