Patent ID: 7020491
Filing Date: 2006-03-28
Classification: H04W

Abstract:
1. A mobile communication system in which user data from a core network is received by a base station control device, the received user data is transmitted from said base station control device to a plurality of radio base stations and the user data is sent out by radio from these plurality of radio base stations to transmit said user data to a mobile terminal from the relevant radio base station, wherein said base station control device is structured to, at the time of communication start, transmit test data to each said radio base station, receives, from each radio base station, a response signal related to the transmitted test data, based on time of said transmission and time of reception of each response from each said radio base station, calculate the amount of transmission delay corresponding to a data transmission time between its own device and each radio base station in question and based on each calculated amount of transmission delay, with one radio base station whose said amount of transmission delay is the largest as a reference, calculate a transmission data buffering time to be applied to each radio base station to be substantially zero or extremely short for the one radio base station in question and to be a finite value conforming to a relative relationship with said amount of transmission delay of said one radio base station for each of the other radio base stations, at the time of transmitting down data supplied from said core network, transmit the data to each corresponding radio base station with each said calculated buffering time applied, and at the time of receiving up data from each said radio base station, based on a change of a difference in time of data reception from each radio base station, adjust a buffering time to be applied, and each said radio base station is structured to, at the time of communication start, upon receiving the test data from said base station control device, transmit the response signal to the base station control device in question with substantially no delay.