Patent Document ID: 8064392
Application ID: 11859287
Patent Flag: 1

Claim One:
1. A method for dynamic resource allocation of downlink in an OFDMA/TDD cellular system, the method comprising the steps of: selecting a user through a GPF algorithm; performing dynamic channel allocation through an ASA (Aggressive Sub-channel Allocation) algorithm so as to perform a FASA (Fairness insured Aggressive Sub-channel Allocation) algorithm for obtaining a multiuser diversity gain; and performing dynamic power allocation through an improved CHC (Chang, Heo and Cha) algorithm, in consideration of a data rate provided to each user and a channel state, wherein the performing of the dynamic channel allocation includes the steps of: searching for sub-channels which can guarantee the highest data rate to the selected user, among sub-channels which are not allocated to other users; calculating data rates which the sub-channels can guarantee to another user; and comparing the calculated data rates, and then allocating a sub-channel, which provides the smallest data rate to another user among the searched sub-channels, to the selected user, wherein in the calculating of the data rates, the data rates are calculated by using an equation: R m * = ∑ k = 0 k ≠ k ASA K - 1 ⁢ r k , m = ∑ k = 0 k ≠ k ASA K - 1 ⁢ q m * ⁡ ( k ) T , where q m* represents a quantity of transmitted data through a sub-channel m*, T represents a time interval and R m* represents the sum of the data rates which can be guaranteed to all users, except for the selected user, at a sub-channel m*.