Patent ID: 7313124

Claim:
A method for transmitting packets adaptively through a downlink in a multicarrier Code Division Multiple Access (MC-CDMA) system, comprising the steps of: a) estimating a signal-to-interference-and-noise ratio (SINR) in a user terminal after channel equalization and despreading by measuring a downlink pilot channel; b) measuring an average interference factor and an average noise power which includes interference power of adjacent cells and background noise power and reports the average interference factor and the average noise power to a central station through an uplink; and c) allocating radio resources adaptively in the central station by determining transmission slots in a transmission frame, the number of spreading codes to be used in each transmission slot, symbol energy for each spreading code, and a transmission method which is a combination of various modulation and coding methods, based on the average interference factor and the average noise power, until transmission slots and packet to be allocated are not available, step c) further includes the steps of: c1) calculating the number of bits that can be allocated in each transmission method; c2) selecting a transmission method to support the highest transmission bit rate among the transmission methods; and c3) allocating radio resources by using the selected transmission method.