Semiconductor device, wireless terminal device, and wireless communication system

A wireless terminal device configured to connect to a connection destination wireless station selected from among a plurality of wireless stations to perform wireless communication, comprising:

• a wireless processing unit configured to transmit or receive a radio signal to or from the plurality of wireless stations;
• and
• a signal processing unit configured to perform a signal process as the radio signal is transmitted or received,
• wherein the signal processing unit comprises a wireless station selection unit configured to select the connection destination wireless station, and
• the wireless station selection unit comprises:
• a power calculation processing unit configured to calculate power values of respective receiving signals from the plurality of wireless stations,
• a storage unit configured to store, in a table, a subset of the power values that are equal to or greater than a defined threshold, wherein the storage unit is further configured to record the subset of the power values in association with a corresponding subset of the plurality of wireless stations,
• a table update processing unit configured to update the table at a defined timing interval, and
• a power variation range detection processing unit configured to detect respective variation ranges of the subset of the power values with reference to the table and to set a wireless station, of the subset of the plurality of wireless stations, corresponding to a variation range, of the variation ranges, that is within a defined range as a priority candidate for the connection destination wireless station.

A wireless communication system, comprising:

• a plurality of wireless stations;
• and
• a wireless terminal device configured to connect to a connection destination wireless station selected from among the plurality of wireless stations to perform wireless communication,
• wherein the wireless terminal device comprises:
• a wireless processing unit configured to at least one of transmit or receive a radio signal to or from the plurality of wireless stations, and
• a signal processing unit configured to perform a signal process based on the radio signal,
• wherein the signal processing unit comprises a wireless station selection unit configured to select the connection destination wireless station, and
• the wireless station selection unit comprises:
• a power calculation processing unit configured to calculate power values of respective receiving signals from the plurality of wireless stations,
• a storage unit configured to record, in a table, a subset of the power values that are equal to or greater than a threshold in association with a corresponding subset of the plurality of wireless stations,
• a table update processing unit configured to update the table at a defined timing interval, and
• a power variation range detection processing unit configured to determine respective variation ranges of the subset of the power values with reference to the table and to set a wireless station, of the subset of the plurality of wireless stations, corresponding to a variation range, of the variation ranges, that is within a defined range as a priority candidate.