Patent ID: 7912478

Claim:
A base station in a wireless communication system comprising: a base station having a first and a second channel and communicating with a terminal by wireless and by time division multiplexing, and a node to perform best effort communication and QoS communication with the terminal, wherein the base station obtains a first wireless resource usage rate in the first channel, based on a first requested bandwidth B i requested by one or plurality of first terminals i during QoS communication through the first channel and a first data rate R i which the first terminal i can receive and which depends on changing a data amount stored in each time slot according to wireless environment, by a following expression: ∑ i ⁢ B i R i wherein the base station obtains a second wireless resource usage rate of a second terminal, which is necessary to ensure a requested bandwidth B, by dividing the second requested bandwidth B requested by an arbitrary second terminal during QoS communication through the first channel by a second data rate R which the second terminal can receive, wherein the base station obtains a predicted value of a wireless resource usage rate in the first channel after the second terminal hands off to the second channel by subtracting the second wireless resource usage rate of the second terminal from the first wireless resource usage rate in the first channel, wherein the base station obtains a third wireless resource usage rate in the second channel, based on a third requested bandwidth B k requested by one or plurality of third terminals k during QoS communication through the second channel and a third data rate R k which the third terminal k can receive, which depends on changing a data amount stored in each time slot according to wireless environment, by a following expression: ∑ k ⁢ B k R k wherein the base station obtains a fourth wireless resource usage rate of the second terminal after the second terminal hands off to the second channel, by dividing the second requested bandwidth B requested by the second terminal by an average R AVE of the data rate which each terminal communicating through the second channel can receive, wherein the base station obtains a predicted value of a wireless resource usage rate in the second channel after the second terminal hands off to the second channel by adding the fourth wireless resource usage rate in the second terminal to the third wireless resource usage rate in the second channel, and wherein the base station hands off the second terminal from the first channel to the second channel in a case where both the obtained predicted value of the wireless resource usage rate in the first channel and the predicted value of the wireless resource usage rate in the second channel respectively become equal to or less than previously determined threshold values.