Patent ID: 7760683

Claim:
A call admission control device in a communication system for transmitting a packet to a plurality of mobile stations, the call admission control device comprising: an existing terminal radio channel quality acquisition unit that acquires: a value indicating a downlink radio channel quality, which is Channel Quality Indicator (CQI) indicating radio quality information, of each of a plurality of mobile stations which have already started communication; a transmission power allocatable to a downlink shared channel; and a number of codes allocatable to the plurality of mobile stations which have already started communication, and then notifies an amount of data transmittable by said each of the plurality of mobile stations which have already started communication in 1 TTI (Time Transmission Interval); an existing terminal target transmission data rate setting unit that sets an existing terminal target transmission data rate of said each of the plurality of mobile stations which have already started communication; and an existing terminal allocation frequency calculation unit that calculates a packet allocation frequency for satisfying the existing terminal target transmission data rate relating to said each of the plurality of mobile stations which have already started communication based on the amount of data transmittable in 1TTI by said each of the plurality of mobile stations which have already started communication and the existing terminal target transmission data rate; wherein an admission of a call from a new mobile station which desires to start communication is controlled such that said each of the plurality of mobile stations which have already started communication can satisfy the existing terminal target transmission data rate.