| 摘要 |
[PROBLEMS]To avoid failing to make radio communication by the effect of a noise or the like due to a shielding material or an electromagnetic wave in a radio LAN system.[MEANS FOR SOLVING PROBLEMS]A radio LAN system comprises a relay device capable of communication with an external system, a base unit (100) capable of communication with the relay device, and a plurality of slave units capable of radio communication with the base unit. The slave units, when some of the slave units cannot receive the synchronization signal from the base unit, include a first group made up of an alternative slave unit (112) having a function of transmitting the information signal received from the base unit to the some of the slave units and a second group made up of non-alternative slave units (122, 124) not having a transmission function to the some of the slave units. |
