Patent ID: 8160042

Claim:
A communication method applied to a mobile communication system in a code division multiple access system for continuously transmitting frames in a normal mode and intermittently transmitting compressed frames in a compressed mode, in accordance with transmission power being controlled with a transmission power control step size, said method comprising: at a base station, transmitting transmission power control information indicating increase or decrease of transmission power to a mobile station; performing interleaving on a downlink frame, one frame by one frame, in bit units in the normal mode, in the normal mode, transmitting a downlink frame continuously; in the compressed mode, compressing an interleaved downlink frame, dividing the interleaved and compressed downlink frame into only two portions, the two portions being a first portion arranged within a frame window and including a front edge of the frame window and a second portion arranged within the frame window and including a rear edge of the frame window, the frame window being the same as a frame window in the normal mode, and transmitting the divided downlink frame intermittently; at a mobile station, receiving transmission power control information from the base station; selecting one of a first transmission power control step size of a first preset decibel level for the normal mode, and a second transmission power control step size of a second preset decibel level for the compressed mode, the second transmission power control step size being greater than the first transmission power control step size; adjusting transmission power with one of the first or second transmission power control step sizes as selected in the selecting step, based on the transmission power control information received in the receiving step; performing interleaving on an uplink frame in bit units in the normal mode and in the compressed mode, the uplink frame being a unit of a transmission data stream; and in the normal mode, transmitting the interleaved uplink frame continuously in accordance with the transmission power adjusted in the adjusting step with the first transmission power control step size, and in the compressed mode, compressing the interleaved uplink frame, dividing the interleaved and compressed uplink frame into a first portion arranged within a frame window and including a front edge of the frame window and a second portion arranged within the frame window and including a rear edge of the frame window, the frame window being the same as a frame window in the normal mode, and transmitting the divided uplink frame intermittently, in accordance with the transmission power adjusted in the adjusting step with the second transmission power control step size.