| 摘要 |
PROBLEM TO BE SOLVED: To connect a call within the area to the public network of a peripheral area not losing a communication function by a disaster by using a specified channel for inter-base-station communication as an emergency time mode in an N channel multiplex TDMA system mobile object radio base station. SOLUTION: For the PHS of four channels for instance, the two channels are allocated for inter-slave-unit communication and the two channels are used for the inter-base-station communication. Since the adjacent base stations are required to regularly differently use time slots, division into two groups A and B is alternately performed. In the case of transmitting the data received from a slave unit Ps by the Am station of the A group to the adjacent station in the emergency time mode, they are transmitted by using a T3 or T4 slot and an R3 or R4 slot is for reception. On the other hand, in the case of similarly transmitting the data received from the slave unit Ps by the Bm station of the B group to the adjacent station in the emergency time mode, the R3 or R4 slot becomes transmission time and the T3 or T4 slot is turned to reception time. Thus, even though a call loss probability is degraded compared to normal time, the call is transmitted to a switchboard during a normal operation. |
