Wireless communication apparatus and interference detection method
According to one embodiment, a wireless communication apparatus is provided with first and second determination units. The first unit determines based on a first carrier sense threshold whether busy state or not and specifies a first time when busy state is determined with the first threshold, and determines based on a second carrier sense threshold smaller than the first threshold whether busy state or not and specifies a second time when busy state is determined. The second unit determines, if at least busy state is determined based on the second threshold and the second time precedes a reference time equal to or earlier than the first time, to perform processing for avoiding interference.
1. A near-field wireless communication apparatus comprising:
a first processor configured to:
detect a first busy state where a received power level becomes equal to or more than a first threshold, and
detect a second busy state where the received power level becomes equal to or more than a second threshold, the second threshold being smaller than the first threshold; and
a second processor configured to:
perform processing interference error in response to detecting the second busy state and not detecting the first busy state, and
perform processing near-field error in response to detecting the first busy state.
2. The apparatus according to claim 1 , the second processor is further configured to perform processing for transmission in response to detecting the second busy state and not detecting the first busy state.
3. The apparatus according to claim 1 , the second processor is further configured to:
determine whether or not a received power level of a second frame preceded by a first frame becomes equal to or more than the second threshold; and
perform reception processing for the second frame based on a result of the determination, when the second processor determines that interference occurs in the first frame.
4. The apparatus according to claim 1 , the second processor is further configured to:
determine whether or not a received power level of a second frame preceded by a first frame becomes equal to or more than the second threshold; and
perform reception processing for the second frame based on a result of the determination, when the second processor determines that an error occurs in the first frame.
5. The apparatus according to claim 1 , the second processor is further configured to count an elapsed time after frame transmission processing is completed.
6. The apparatus according to claim 5 , the second processor is further configured to:
determine whether the received power level becomes equal to or more than the second threshold before the elapsed time becomes a fixed period of time; and
perform reception processing when the fixed period of time elapses after the frame transmission processing is completed, in response to determining that the received power level becomes equal to or more than the second threshold before the elapsed time becomes the fixed period of time.
7. The apparatus according to claim 1 , the first processor and the second processor are the same processor.
8. The apparatus according to claim 1 , further comprising a third processor configured to perform frequency conversion of a received frame.
9. The apparatus according to claim 1 , further comprising at least one antenna.
10. The apparatus according to claim 1 , further comprising a light-emitting diode (LED) configured to notify a user of a notification.
11. A wireless communication apparatus comprising:
a buffer configured to store a frame; and
processing circuitry,
the processing circuitry being configured to:
detect a first busy state where a received power level becomes equal to or more than a first threshold,
detect a second busy state where the received power level becomes equal to or more than a second threshold, the second threshold being smaller than the first threshold,
perform processing interference error in response to detecting the second busy state and not detecting the first busy state, and
perform processing near-field error in response to detecting the first busy state.
12. The apparatus according to claim 11 , the processing circuitry is further configured to perform processing for transmission in response to detecting the second busy state and not detecting the first busy state.
13. The apparatus according to claim 11 , the processing circuitry is further configured to:
determine whether or not a received power level of a second frame preceded by a first frame becomes equal to or more than the second threshold; and
perform reception processing for the second frame based on a result of the determination, when the processing circuitry determines that interference occurs in the first frame.
14. The apparatus according to claim 11 , the processing circuitry is further configured to:
determine whether or not a received power level of a second frame preceded by a first frame becomes equal to or more than the second threshold; and
perform reception processing for the second frame based on a result of the determination, when the processing circuitry determines that an error occurs in the first frame.
15. An interference detection method for a wireless communication apparatus including a first processor and a second processor, the method comprising:
detecting, by the first processor, a first busy state where a received power level becomes equal to or more than a first threshold;
detecting, by the first processor, a second busy state where the received power level becomes equal to or more than a second threshold, the second threshold being smaller than the first threshold;
performing processing interference error in response to detecting the second busy state and not detecting the first busy state, and
performing, by the second processor, processing near-field error in response to detecting the first busy state.
16. The method according to claim 15 , further comprising:
performing, by the second processor, processing for transmission in response to detecting the second busy state and not detecting the first busy state.
17. The method according to claim 15 , further comprising:
determining, by the second processor, whether or not a received power level of a second frame preceded by a first frame becomes equal to or more than the second threshold; and
performing, by the second processor, reception processing for the second frame based on a result of the determination, when it is determined that interference occurs in the first frame.
18. The method according to claim 15 , further comprising:
determining, by the second processor, whether or not a received power level of a second frame preceded by a first frame becomes equal to or more than the second threshold; and
performing, by the second processor, reception processing for the second frame based on a result of the determination, when it is determined that an error occurs in the first frame.
19. The method according to claim 15 , further comprising:
counting, by the second processor, an elapsed time after frame transmission processing is completed.
20. The method according to claim 19 , further comprising:
determining, by the second processor, whether the received power level becomes equal to or more than the second threshold before the elapsed time becomes a fixed period of time; and
performing, by the second processor, reception processing when the fixed period of time elapses after the frame transmission processing is completed, in response to determining that the received power level becomes equal to or more than the second threshold before the elapsed time becomes the fixed period of time.