| 摘要 |
<p>Radio signal transmitting/receiving units 20-1 to 20-n manage all operation data used in a plurality of sectors. Among such operation data, desired operation data is selected for data transmission and reception for a sector corresponding to the selected operation data. Among the radio signal transmitting/receiving units 20-1 to 20-n, a spare radio signal transmitting/receiving unit which is not normally used, recognizes the operation state of the other radio signal transmitting/receiving units via a state data common line 62. In the event of trouble occurrence in any other radio signal transmitting/receiving unit, the spare radio signal transmitting/receiving unit executes data transmission and reception for the sector in which the in-trouble unit has been executing the data transmission and reception, by using the operation data corresponding to that sector. <IMAGE></p> |
