Wireless communication apparatus, recording medium, and wireless communication method

1. A wireless communication apparatus comprising a processor that executes a process comprising:

performing a download process selected from between a first download process that downloads data through a wireless communication by dividing the data into sections while using a plurality of threads and a second download process that downloads the data while using a single thread;

measuring communication quality of the wireless communication;

judging, when the selected download process is the first download process and when a deterioration in the communication quality is measured during the first download process, whether or not it is possible to complete the download in all of the plurality of threads before a timeout of the download; and

switching the first download process into the second download process, when it is determined to be impossible to complete the download in all of the plurality of threads before the timeout, wherein

the measuring includes measuring a value indicating communication line quality of the wireless communication, the value indicating the communication line quality of the wireless communication being a Received Signal Strength Indication (RSSI) value or a Signal-to-Noise Ratio (SNR) value, and includes measuring a value indicating a throughput of the wireless communication, and

the judging includes

performing a first judgement that judges whether or not the measured value indicating the communication line quality during the first download process is equal to or larger than a first predetermined value,

performing a second judgement that judges the measured value indicating the throughput is equal to or smaller than a second predetermined value, and

when the measured value indicating the communication line quality during the first download process is equal to or larger than the first predetermined value while the measured value indicating the throughput is equal to or smaller than the second predetermined value as a result of the first judgement and the second judgement, judging whether or not it is possible to complete the download in all of the plurality of threads before the timeout of the download.

2. The wireless communication apparatus according to claim 1 , wherein, when the deterioration in the communication quality is measured during the first download process, the judging includes judging on a basis of a remaining time period before the timeout, whether or not it is possible to complete the download in all of the plurality of threads within the remaining time period.

3. A non-transitory computer-readable recording medium having stored therein a wireless communication computer program that causes a computer to execute a process comprising:

performing a download process selected from between a first download process that downloads data through a wireless communication by dividing the data into sections while using a plurality of threads and a second download process that downloads the data while using a single thread;

measuring communication quality of the wireless communication;

judging, when the selected download process is the first download process and when a deterioration in the communication quality is measured during the first download process, whether or not it is possible to complete the download in all of the plurality of threads before a timeout of the download; and

switching the first download process into the second download process, when it is determined to be impossible to complete the download in all of the plurality of threads before the timeout, wherein

the measuring includes measuring a value indicating communication line quality of the wireless communication, the value indicating the communication line quality of the wireless communication being a Received Signal Strength Indication (RSSI) value or a Signal-to-Noise Ratio (SNR) value, and includes measuring a value indicating a throughput of the wireless communication, and

the judging includes

performing a first judgement that judges whether or not the measured value indicating the communication line quality during the first download process is equal to or larger than a first predetermined value,

performing a second judgement that judges the measured value indicating the throughput is equal to or smaller than a second predetermined value, and

when the measured value indicating the communication line quality during the first download process is equal to or larger than the first predetermined value while the measured value indicating the throughput is equal to or smaller than the second predetermined value as a result of the first judgement and the second judgement, judging whether or not it is possible to complete the download in all of the plurality of threads before the timeout of the download.

4. The non-transitory computer-readable recording medium according to claim 3 , wherein, when the deterioration in the communication quality is measured during the first download process, the judging includes judging on a basis of a remaining time period before the timeout, whether or not it is possible to complete the download in all of the plurality of threads within the remaining time period.

5. A wireless communication method comprising:

performing a download process selected from between a first download process that downloads data through a wireless communication by dividing the data into sections while using a plurality of threads and a second download process that downloads the data while using a single thread, using a processor;

measuring communication quality of the wireless communication, using the processor;

judging, when the selected download process is the first download process and when a deterioration in the communication quality is measured during the first download process, whether or not it is possible to complete the download in all of the plurality of threads before a timeout of the download, using the processor; and

switching the first download process into the second download process, when it is determined to be impossible to complete the download in all of the plurality of threads before the timeout, using the processor, wherein

the measuring includes measuring a value indicating communication line quality of the wireless communication, the value indicating the communication line quality of the wireless communication being a Received Signal Strength Indication (RSSI) value or a Signal-to-Noise Ratio (SNR) value, and includes measuring a value indicating a throughput of the wireless communication, and

the judging includes

performing a first judgement that judges whether or not the measured value indicating the communication line quality during the first download process is equal to or larger than a first predetermined value,

performing a second judgement that judges the measured value indicating the throughput is equal to or smaller than a second predetermined value, and

when the measured value indicating the communication line quality during the first download process is equal to or larger than the first predetermined value while the measured value indicating the throughput is equal to or smaller than the second predetermined value as a result of the first judgement and the second judgement, judging whether or not it is possible to complete the download in all of the plurality of threads before the timeout of the download.

6. The wireless communication method according to claim 5 , wherein, when the deterioration in the communication quality is measured during the first download process, the judging includes judging on a basis of a remaining time period before the timeout, whether or not it is possible to complete the download in all of the plurality of threads within the remaining time period.