Apparatus and method for controlling transmission power in communication systems using orthogonal frequency division multiple access scheme

An apparatus for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a frequency band into a plurality of sub-carrier bands and multiplexing the sub-carrier signals of the sub-carrier bands based on multiple frequency reuse factors, the apparatus comprising:

• a transmission power allocator for determining a target Signal to Interference and Noise Ratio (SINR) of sub-carrier signals employing a first frequency reuse factor selected from the multiple frequency reuse factors, determining a weight of the sub-carrier signals employing the first frequency reuse factor and a weight of other sub-carrier signals employing frequency reuse factors other than the first frequency reuse factor corresponding to the target SINR, and applying the determined weights to the sub-carrier signals employing the first frequency reuse factor and the sub-carrier signals employing frequency reuse factors other than the first frequency reuse factor, thereby controlling the transmission power.

An apparatus for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a frequency band into a plurality of sub-carrier bands and multiplexing the sub-carrier signals of the sub-carrier bands based on frequency reuse factors of 1 and K, the apparatus comprising:

• a transmission power allocator for determining a target Signal to Interference and Noise Ratio (SINR) of sub-carrier signals employing frequency reuse factor of K, determining weights of the sub-carrier signals employing the frequency reuse factors of 1 and K corresponding to the target SINR, and applying the determined weights to the sub-carrier signals employing the frequency reuse factors of 1 and K, thereby controlling the transmission power.

An apparatus for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a whole frequency band into a plurality of sub-carrier bands and multiplexing the sub-carrier signals of the sub-carrier bands based on frequency reuse factors of 1 and K, the apparatus comprising:

• a transmission power allocator for determining an improvement value of a Signal to Interference and Noise Ratio (SINR) of sub-carrier signals employing the frequency reuse factor of K to increase the SINR of the sub-carrier signals employing the frequency reuse factor of K obtained in a previous time duration, determining weights of the sub-carrier signals employing the frequency reuse factors of 1 and K corresponding to the improvement value of the SINR, and applying the determined weights to the sub-carrier signals employing the frequency reuse factors of 1 and K, thereby controlling the transmission power.

An apparatus for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a frequency band into a plurality of sub-carrier bands, dividing the sub-carrier signals of the sub-carrier bands into data sub-carrier signals for transferring data signals and reference signal sub-carrier signals for transferring predetermined reference signals and multiplexing the sub-carrier signals of the sub-carrier bands based on frequency reuse factors of 1 and K, the apparatus comprising:

• a transmission power allocator for determining a target Signal to Interference and Noise Ratio (SINR) of the data sub-carrier signals employing the frequency reuse factor of K, determining weights of the data sub-carrier signals and pilot sub-carrier signals employing the frequency reuse factors of 1 and K corresponding to the target SINR, and applying the determined weights to the data sub-carrier signals and pilot sub-carrier signals employing the frequency reuse factors of 1 and K, respectively, thereby controlling the transmission power.

A method for controlling transmission power in a cellular communication system, the method comprising the steps of:

• dividing sub-carriers of the cellular communication system into at least two groups;
• and
• applying mutually different frequency reuse factors to the groups and allocating mutually different transmission power to the groups employing mutually different frequency reuse factors.

An apparatus for controlling transmission power in a cellular communication system, the apparatus comprising:

• a transmission power allocator for applying mutually different frequency reuse factors to sub-carriers of the cellular communication system, which are divided into at least two groups, in such a manner that each of two groups employs mutually different frequency reuse factors.

A method for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a frequency band into a plurality of sub-carrier bands and multiplexing the sub-carrier signals of the sub-carrier bands based on at least two frequency reuse factors, the method comprising the steps of:

• determining the transmission power to be applied to the sub-carrier signals employing mutually different frequency reuse factors;
• and
• applying the determined transmission power to the sub-carrier signals employing mutually different frequency reuse factors and transmitting the sub-carrier signals.

An apparatus for controlling transmission power to be allocated to sub-carrier signals in a cellular communication system capable of dividing a frequency band into a plurality of sub-carrier bands and multiplexing the sub-carrier signals of the sub-carrier bands based on at least two frequency reuse factors, the apparatus comprising:

• a controller for determining the transmission power to be applied to the sub-carrier signals employing mutually different frequency reuse factors;
• and
• a transmission power allocator for applying the determined transmission power to the sub-carrier signals employing mutually different frequency reuse factors to transmit the sub-carrier signals.