Wireless terminal device, wireless communication system, and wireless communication control method

A radio communication system comprising:

• a plurality of radio base stations that transmit respectively, by means of radio communication, service data that includes at least one of a plurality of items of information that should be acquired at different predetermined intervals, and that have mutually separated communication areas;
• and
• a radio terminal apparatus that can travel between communication areas of the plurality of radio base stations and performs radio communication with the radio base station, wherein:
• the radio base station transmits, by means of the service data, information relating to a minimum traveling time when traveling from a communication area of that radio base station to a communication area of a neighboring other the radio base station;
• and
• the radio terminal apparatus has:
• an application section that acquires by means of the radio communication, and uses, service data that includes the plurality of items of information;
• a radio communication section that performs the radio communication;
• an in-service-area determination section that determines, by means of the radio communication, which of the plurality of items of information is possible to be acquired, based on service data acquired by means of the radio communication, and acquires the minimum traveling time;
• an activation control section that, when it is possible to acquire at least one of the plurality of items of information by means of the radio communication, controls activation/stopping of the radio communication section so as to perform the radio communication at the predetermined interval corresponding to that information;
• and
• an out-of-area activation interval selection section that, when a time when it is impossible to acquire any of the plurality of items of information by means of the radio communication reaches a predetermined length of time based on the minimum traveling time, causes the activation control section to switch to control of the shortest interval among the plurality of predetermined intervals.

A radio communication control method in a radio terminal apparatus provided with a radio communication section that performs radio communication with a radio base station and an application section that acquires by means of the radio communication, and uses, service data that includes a plurality of items of information that should be acquired at different predetermined intervals, the radio communication control method comprising:

• a step of determining, by means of the radio communication, which of the plurality of items of information is possible to be acquired, based on service data acquired by means of the radio communication;
• a step of, when a time when it is impossible to acquire any of the plurality of items of information by means of the radio communication reaches a predetermined length of time, switching control of activation/stopping of the radio communication section so as to perform the radio communication at the shortest interval among the plurality of predetermined intervals;
• and
• a step of, when it is possible to acquire at least one of the plurality of items of information by means of the radio communication, switching control of activation/stopping of the radio communication section so as to perform the radio communication at the predetermined interval corresponding to that information.