| 摘要 |
PROBLEM TO BE SOLVED: To provide a polling mode communication system 10 for a vehicle with a good communication efficiency irrespective of a pause of a partial mobile station 30. SOLUTION: A plurality of n radio waves for a response signal is used. The mobile station 30 is grouped into n pieces and each mobile station 30 responds with the radio waves for the response signal of a group of its own. A radio wave for a polling signal may be used both as the one radio wave for the response signal. In order to cope with an imbalance of an assignment number of each group by a surplus and deficit of each mobile station 30, a polling command from a base station 20 to the mobile station 30 contains both a type of commands and a list of the mobile station 30 of a sending destination (a vehicle 35 mounting the mobile station 30). In the case of n=2, on a sending destination list, the odd-numbered mobile stations 30 belong to a group 1. The even-numbered mobile stations 30 belong to a group 2. A response order of each mobile station 30 in each group becomes an order of each mobile station 30 when the mobile station 30 of the same group is counted from a head of the sending destination list. COPYRIGHT: (C)2008,JPO&INPIT
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