MOBILE COMMUNICATION SYSTEM USING RECEIVING APPARATUS AND POWER SUPPLY CONTROL METHOD
A receiving apparatus includes an error detecting circuit configured to detect an error of a reception signal; an error correcting circuit configured to correct the detected error of the reception signal; a power measuring circuit configured to measure a power value of the reception signal; and a power supply control section configured to control a power supply to the error correcting circuit based on the power value. The receiving apparatus further includes a receiving circuit configured to receive a radio signal; a rake finger section configured to execute a despreading process on the signal received by the receiving circuit, and a rake combining section configured to carry out a rake combination of the plurality of signals subjected to the despreading process to generate the reception signal.
1 . A receiving apparatus comprising:
an error detecting circuit configured to detect an error of a reception signal;
an error correcting circuit configured to correct the detected error of said reception signal;
a power measuring circuit configured to measure a power value of said reception signal; and
a power supply control section configured to control a power supply to said error correcting circuit based on said power value.
2 . The receiving apparatus according to claim 1 , further comprising:
a receiving circuit configured to receive a radio signal, and
a rake finger section configured to execute a despreading process on the signal received by said receiving circuit,
wherein said reception signal is obtained based on said despreading process.
3 . The receiving apparatus according to claim 2 , wherein said rake finger section comprises a plurality of finger circuits configured to execute said despreading process on a plurality of signals as the radio signal received by said receiving circuit.
4 . The receiving apparatus according to claim 3 , wherein said power supply control section stops a power supply to at least one of said plurality of finger circuits based on said power value.
5 . The receiving apparatus according to claim 3 , wherein said power supply control section stops a power supply to all of said plurality of finger circuits other than one finger circuit related with a maximum power value and said error correcting circuit.
6 . The receiving apparatus according to claim 3 , further comprising;
a rake combining section configured to carry out a rake combination of said plurality of signals subjected to the despreading process to generate said reception signal.
7 . The receiving apparatus according to claim 6 , wherein said power supply control unit stops the power supply to said error correcting circuit and said rake combining section in based on said power value.
8 . The receiving apparatus according to claim 1 , further comprising:
a reception power determining section configured to compare said power value and a power condition as a predetermined threshold value; and
an error rate determining section configured to compare an error rate of said reception signal and an error condition as a predetermined threshold value,
wherein said power supply control unit stops the power supply to said error correcting circuit when said power value is larger than said power condition and said error rate is smaller than said error condition.
9 . The receiving apparatus according to claim 8 , wherein said power supply control unit restarts the power supply to said error correcting circuit when said power value is smaller than said power condition.
10 . The receiving apparatus according to claim 8 , wherein said power supply control unit restarts the power supply to said error correcting circuit, when said error percentage is larger than said error condition.
11 . The receiving apparatus according to claim 1 , wherein said power supply control unit restarts the power supply to said error correcting circuit when a predetermined time elapsed after the stop of the power supply.
12 . The receiving apparatus according to claim 6 , wherein said power supply control unit restarts the power supply to said error correcting circuit when a predetermined time elapsed after the stop of the power supply.
13 . A mobile communication system comprising:
a mobile terminal comprising a receiving apparatus;
wherein said receiving apparatus comprises:
an error detecting circuit configured to detect an error of a reception signal;
an error correcting circuit configured to correct the detected error of said reception signal;
a power measuring circuit configured to measure a power value of said reception signal; and
a power supply control section configured to control a power supply to said error correcting circuit based on said power value, and
a base station apparatus configured to carry out a radio communication with said mobile terminal by a CDMA (Code Division Multiple Access) method.
14 . A reception control method comprising:
detecting an error of a reception signal,
correcting the detected error of said reception signal by an error correcting circuit;
measuring a power value of said reception signal; and
controlling a power supply to said error correcting circuit based on said power value.
15 . The reception control method according to claim 14 , further comprising:
receiving a radio signal; and
performing a despreading process on the received signal by a rake finger section,
wherein said reception signal is produced through the despreading process.
16 . The reception control method according to claim 15 , wherein said rake finger section comprises a plurality of finger circuits,
said performing a despreading process comprises:
performing a despreading process on each of a plurality of signals of the received signal by a corresponding one of said plurality of finger circuits, and
said reception signal is produced based on said plurality of signals which have been subjected to the despreading process.
17 . The reception control method according to claim 16 , wherein said controlling comprises:
stopping the power supply to at least one of said plurality of finger circuits in addition to said error correcting circuit based on said power value.
18 . The reception control method according to claim 16 , wherein said controlling comprises:
stopping the power supply to said plurality of finger circuits other than one finger circuit related to a maximum power value, in addition to said error correcting circuit based on said power value.
19 . The reception control method according to claim 16 , further comprising:
generating said reception signal by rake combining said plurality of signals subjected to said despreading process by a rake combining section.
20 . The reception control method according to claim 19 , wherein said controlling comprises:
stopping the power supply to said rake combining section in addition to said error correcting circuit based on said power value.
21 . The reception control method according to claim 14 , further comprising:
setting a power condition as a preset threshold value; and
setting an error condition as a preset threshold value,
wherein said controlling comprises:
comparing said power value and said power condition;
comparing an error rate of said reception signal and said error condition; and
stopping the power supply to said error correcting circuit when said power value is larger than said power condition and said error rate is smaller than said error condition.
22 . The reception control method according to claim 20 , further comprising:
restarting the power supply to said error correcting circuit when said power value is smaller than said power condition.
23 . The reception control method according to claim 21 , further comprising:
restarting the power supply to said error correcting circuit when said error rate is larger than said error condition.
24 . The reception control method according to claim 14 , further comprising:
restarting the power supply to said error correcting circuit when a predetermined time elapsed after the stop of the power supply.
25 . The reception control method according to claim 19 , further comprising:
restarting the power supply to said rake combining section when a predetermined time elapsed after the stop of the power supply.