Patent ID: 7012904

Claim:
A method for controlling a transmission capacity for allocating efficiently the transmission capacity on a wired line in every call in a data communication wherein said data communication relates to a mobile communication system in which data is transmitted in a wireless link and said wired line in accordance with a packet system, comprising the steps of: measuring a practical transmission speed of said data on said wireless link in said every call; said practical transmission speed being measured in a radio base station in radio communication with a mobile unit via said wireless link, determining said transmission capacity that is required for transmitting said data at said practical transmission speed through said wired line at the minimum level in said every call as a target transmission capacity; transmitting a transmission capacity demanding signal from said radio base station to a relay station and from said relay station to a mobile switching station; in said mobile switching station, in response to said capacity demanding signal, decreasing a permissible transmission capacity of said wired line in the case where said permissible transmission capacity that is usable for transmission of said data through said wired line and determined in said every call is larger than said target transmission capacity; and in said mobile switching station, in response to said capacity demanding signal, increasing the permissible transmission capacity of said wired line in the case where said permissible transmission capacity is smaller than said target transmission capacity; whereby a transmission speed of said data in said wired line is controlled so as to be equal to or less than said permissible transmission capacity.