Patent ID: 7616596

Claim:
An uplink scheduling method of a Base Transceiver Station (BTS) in a wireless mobile communication system in which a mobile station reports a headroom value to the BTS, the method comprising the steps of: normalizing the headroom value indicating an amount of currently used transmission power and additionally usable transmission power according to a pre-set reference transmission format; determining a mean data rate of the mobile station; and determining a priority of the mobile station considering the normalized headroom value and the mean data rate, wherein the pre-set reference transmission format includes at least one of a modulation method, a coding rate, and a number of slots allocated, and wherein the priority of the mobile station is determined using Priority UL = ⁢ Data_Rate ⁢ ( SINR ) E ⁡ ( data ⁢ ⁢ rate ) α · U min , nrtPS · U max · W = ⁢ Data_Rate ⁢ ( QPSK_ ⁢ 1 ⁢ / ⁢ 2 ) · N slot ( Headroom , QPSK_ ⁢ 1 ⁢ / ⁢ 2 ) · ⁢ { SINR req ⁡ ( QPSK_ ⁢ 1 ⁢ / ⁢ 2 ) SINR req ⁡ ( MCS previous ) · MPR ⁡ ( QPSK_ ⁢ 1 ⁢ / ⁢ 2 ) MPR ⁡ ( MCS previous ) } E ⁡ ( data ⁢ ⁢ rate ) α · ⁢ U min , nrtPS · U max · W , where E(data rate) denotes a mean data rate of the mobile station, SINR denotes a signal to interference and noise ratio, Data Rate(SINR) denotes a current SINR by the E(data rate), MCS previous denotes the MCS previously allocated to the mobile station, Data Rate(QPSK ½) denotes the data rate for the reference MCS level, N slot (Headroom, QPSK ½) denotes the number of allocated slots for the normalized headroom value according to the reference MCS level, SINR req ⁡ ( QPSK_ ⁢ 1 ⁢ / ⁢ 2 ) SINR req ⁡ ( MCS previous ) denotes the first difference, MPR denotes Modulation order Product code Rate, MPR ⁡ ( QPSK_ ⁢ 1 ⁢ / ⁢ 2 ) MPR ⁡ ( MCS previous ) denotes the second difference, α denotes a fairness exponent value for fair scheduling, U min,nrtPS denotes a factor for reflecting a minimum reserved traffic rate, U max denotes a value for reflecting a maximum sustained traffic rate, and W denotes a weight factor for reflecting a traffic priority according to connection.