Abstract: When the total number of transmission request time slots from a base station and a subscriber station exceeds the the radio line, the ratio of the number of communication time slots against the total number of transmission request times slots from the base station and the subscriber station is calculated and the number of time slots allocated for each subscriber station is determined by a product of a total number and ratio of the transmission request time slots from the subscriber station.

Abstract: A first sector cell is set as an object for measurement (S101). Reception levels in each time slot in the number of TDMA-TDD frames is measured for the object cell (S102) and for all the cells (S103 and S105). The results of the measurement of a specific sector cell are added to the results of the measurement of a sector cell opposite the specific sector cell, and time slots in which control channels can be placed are extracted for each sector cell (S106 to S108). TDMA-TDD frames are then allocated such that the control channels of each sector cell coincide with time slots in which control channels can be placed (S109). In this way, control channels are placed in time slots such that a base station having a sector cell structure avoids interference from the same frequency.

Abstract: A first sector cell is set as the object for measurement (S101). Reception levels in each time slot in the number of TDMA-TDD frames corresponding to the number of sector cells within the base station is measured for the object cell (S102). This measurement is performed for all the cells (S103 and S105). The results of the measurement of the reception levels of a specific sector cell are added to the results of the measurement of the reception levels of a sector cell opposite the specific sector cell, and time slots in which control channels can be placed are extracted for each sector cell (S106 to S108). TDMA-TDD frames are then allocated such that the control channels of each sector cell coincide with time slots in which control channels can be placed (S109). As a result, a control channel placement method is provided in which a TDMA-TDD mode is employed and in which control channels are placed in time slots such that a base station having a sector cell structure avoids interference from the same frequency.