Radio base apparatus, transmission power control method, and transmission power control program
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.
1. 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.
2. The radio base apparatus according to claim 1 , wherein
said transmitting power control means controls transmitting power such that transmitting power at said first timing is decreased and transmitting power at said second timing is increased, of a down-link signal to a terminal communicating with said radio base apparatus.
3. The radio base apparatus according to claim 1 , wherein
said transmitting power control means controls transmitting power such that transmitting power at said first timing of a down-link signal to a terminal communicating with said radio base apparatus is decreased.
4. The radio base apparatus according to claim 1 , wherein
said transmitting power control means controls transmitting power such that transmitting power at said second timing of a down-link signal to a terminal communicating with said radio base apparatus is increased.
5. The radio base apparatus according to claim 1 , wherein
said transmitting power control means controls transmitting power such that when said first timing of a down-link signal to a first terminal communicating with said radio base apparatus overlaps said second timing of a down-link signal to a second terminal communicating with said radio base apparatus, transmitting power at said second timing of the down-link signal to said first terminal is increased and transmitting power at said first timing of the down-link signal to said second terminal is decreased.
6. The radio base apparatus according to claim 1 , wherein
said transmitting power control means controls transmitting power such that transmitting power of a down-link signal to a second terminal communicating with said radio base apparatus is decreased at said first timing of a down-link signal to a first terminal communicating with said radio base apparatus.
7. The radio base apparatus according to claim 1 , wherein
said transmitting power control means controls transmitting power such that transmitting power of a down-link signal to a second terminal communicating with said radio base apparatus is increased at said second timing of a down-link signal to a first terminal communicating with said radio base apparatus.
8. 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.
9. The transmitting power control method according to claim 8 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power at said first timing is decreased and transmitting power at said second timing is increased, of a down-link signal to a terminal communicating with said radio base apparatus.
10. The transmitting power control method according to claim 8 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power at said first timing of a down-link signal to a terminal communicating with said radio base apparatus is decreased.
11. The transmitting power control method according to claim 8 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power at said second timing of a down-link signal to a terminal communicating with said radio base apparatus is increased.
12. The transmitting power control method according to claim 8 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that when said first timing of a down-link signal to a first terminal communicating with said radio base apparatus overlaps said second timing of a down-link signal to a second terminal communicating with said radio base apparatus, transmitting power at said second timing of the down-link signal to said first terminal is increased and transmitting power at said first timing of the down-link signal to said second terminal is decreased.
13. The transmitting power control method according to claim 8 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power of a down-link signal to a second terminal communicating with said radio base apparatus is decreased at said first timing of a down-link signal to a first terminal communicating with said radio base apparatus.
14. The transmitting power control method according to claim 8 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power of a down-link signal to a second terminal communicating with said radio base apparatus is increased at said second timing of a down-link signal to a first terminal communicating with said radio base apparatus.
15. 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.
16. The transmitting power control program according to claim 15 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power at said first timing is decreased and transmitting power at said second timing is increased, of a down-link signal to a terminal communicating with said radio base apparatus.
17. The transmitting power control program according to claim 15 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power at said first timing of a down-link signal to a terminal communicating with said radio base apparatus is decreased.
18. The transmitting power control program according to claim 15 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power at said second timing of a down-link signal to a terminal communicating with said radio base apparatus is increased.
19. The transmitting power control program according to claim 15 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that when said first timing of a down-link signal to a first terminal communicating with said radio base apparatus overlaps said second timing of a down-link signal to a second terminal communicating with said radio base apparatus, transmitting power at said second timing of the down-link signal to said first terminal is increased and transmitting power at said first timing of the down-link signal to said second terminal is decreased.
20. The transmitting power control program according to claim 15 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power of a down-link signal to a second terminal communicating with said radio base apparatus is decreased at said first timing of a down-link signal to a first terminal communicating with said radio base apparatus.
21. The transmitting power control program according to claim 15 , wherein
said step of controlling transmitting power includes a step of controlling transmitting power such that transmitting power of a down-link signal to a second terminal communicating with said radio base apparatus is increased at said second timing of a down-link signal to a first terminal communicating with said radio base apparatus.