Patent ID: 7634278
Filing Date: 2009-12-15
Classification: H04W

Abstract:
1. A base station in a wireless communication system comprising the base station to communicate with a terminal by wireless, by time division multiplexing in a downward direction to the terminal, and by code division multiplexing in an upward direction from the terminal, and a node to perform best effort communication and QoS communication with the terminal through the base station, wherein the base station comprises: a requested bandwidth storage part in which a first down requested bandwidth requested by one or plurality of first terminals during QoS communication, a second down requested bandwidth requested by a second terminal trying to perform QoS communication, and an up requested bandwidth are stored for each terminal; a data rate reception management part that receives a data amount which the first and the second terminals can receive in each time slot from the terminals, which depends on changing the data amount stored in each time slot according to wireless environment, calculates a first and a second data rates which the first and the second terminals can receive by obtaining a time average value of the data amount for each terminal, and stores the data rates for each terminal; an S/N management part to store a value of S/N of a pilot channel for each terminal; an ROT management part to store a value of ROT (Rise Over Thermal) for each up channel; a threshold value storage part to store a previously determined threshold value indicating an allowable upper limit of the ROT; and a control part to control the base station, and wherein the control part obtains a down wireless resource available rate, based on a first down requested bandwidth B the control part obtains a down wireless resource usage rate of the second terminal necessary to ensure the second requested bandwidth B, by dividing the second down requested bandwidth B which is stored in the requested bandwidth storage part and is requested by the second terminal by the second data rate R which the second terminal can receive and which is stored in the data rate reception management part, the control part obtains an up wireless resource available rate, based on a value T of ROT of an up channel stored in the ROT management part and a threshold value T the control part obtains an up wireless resource usage rate of the second terminal, which is necessary to ensure the up requested bandwidth stored in the requested bandwidth storage part and is requested by the second terminal, by a following expression: where, A is a ratio of total transmission power to transmission power of a pilot channel when the second terminal transmits data in the up requested bandwidth, and uniquely determined according to the up requested bandwidth, P is an S/N value of the pilot channel of the second terminal stored in the S/N management part, T is ROT of an up channel stored in the ROT management part, and T 1 is a previously determined threshold value indicating an allowable upper limit of ROT, which is stored in the threshold value storage part, and the control part transmits, with respect to the second terminal in which the down wireless resource available rate is equal to or more than the wireless resource usage rate, and in which the up wireless resource available rate is equal to or more than the up wireless resource usage rate, a connection establishment request for QoS, for performing QoS communication between the second terminal and the node, to the node.