Patent ID: 6781966
Filing Date: 2004-08-24
Classification: H04W

Abstract:
A forward direction power control method using a backward direction power control sub-channel for a mobile communication system, comprising the steps of:a channel information and channel transmission and receiving step for transmitting and receiving a channel information for performing an inner loop and a channel corresponding to the channel information for a forward direction power control between a mobile station and a base station; a channel-based receiving power measuring step for measuring a channel-based current receiving power when a mobile station receives a channel in the channel information and channel transmission and receiving step; an outer loop operation step for determining a channel-based reference receiving power that the mobile station receives as the mobile station performs an outer loop at a period of 20 ms after the channel-based receiving power measuring step; an inner loop operation step for performing an inner loop at a period of 1.25 ms by the mobile station after the outer loop operation step and comparing the current channel-based receiving power measured in the channel-based receiving power measuring step and the channel-based reference receiving power determined in the outer loop operation and determining an information for requesting a power up or down of the base station transmission signal and allocating the determined information to a power control bit (PCB) of the backward direction power control sub-channel; a backward direction power control sub-channel transmission and receiving and power control step for transmitting and receiving a backward direction power control sub-channel including the PCB having an information allocated in the inner loop operation between the mobile station and the base station and controlling the power of the base station transmission signal in accordance with the information allocated to the PCB of the backward direction power control sub-channel; an outer loop report message transmission state determination step in which the mobile station is determined to transmit the outer loop report message to the base station after the backward direction power control sub-channel transmission and receiving and power control step; an outer loop report message transmission and power control step for transmitting and receiving an outer loop report message between the mobile station and the base station in the case that the result determined in the outer loop report message transmission state determination step corresponds to the outer loop report message transmission permission and performing the power control of the base station transmission signal with respect to the base station transmission signal; and an outer loop report message non-transmission step for performing the channel information and channel transmission and receiving step in a state that the mobile station does not transmit the outer loop report message to the base station in the case that the result determined in the outer loop report message transmission state determination step does not correspond to the outer loop report message transmission permission and performing the next steps.