Patent ID: 7773568

Claim:
An inter-station transmission method used in a mobile communication system comprising a mobile station and a base station operable to return, to the mobile station by means of a TDMA system, a response packet, the response packet being returned by the base station in response to a packet received from the mobile station, and the response packet being returned within a same time slot used for receiving the response packet, wherein the base station includes: a radio base station operable to demodulate an uplink packet signal received from the mobile station and extract uplink transmission data, and operable to modulate downlink transmission data to be transmitted to the mobile station and generate a downlink packet signal; a communication control station operable to receive the uplink transmission data from the radio base station, generate downlink transmission data corresponding to the uplink transmission data received from the radio base station and transmit the generated downlink transmission data to the radio base station; and an inter-station transmission path that establishes a wired connection between the radio base station and the communication control station, and wherein the inter-station transmission method includes: in the radio base station, transmitting the uplink transmission data from the radio base station to the communication control station, the uplink transmission data being transmitted in a TDMA frame format used for a radio link between the radio base station and the mobile station; transmitting the downlink transmission data, in the TDMA frame format, from the communication control station to the radio base station in accordance with a predetermined communication control station transmission clock, wherein the downlink transmission data includes a channel data packet, which is within the TDMA frame, to be transmitted inserted therein, and includes dummy data for reproducing a radio base station reception clock inserted therein in a period in which the channel data packet to be transmitted is not present; in the communication control station, processing the uplink transmission data received from the radio base station in the TDMA frame format; in the radio base station, reproducing the radio base station reception clock synchronized with the predetermined communication control station transmission clock, the radio base station reception clock being reproduced from the downlink transmission data received from the communication control station; and in the radio base station, processing the downlink transmission data using the radio base station reception clock.