Patent ID: 6667961
Filing Date: 2003-12-23
Classification: H04B,H04J,H04W

Abstract:
A base station (BS) transmitting device for transmitting frames with multicode scheme in a transmission period of a frame period when the handoff is required, the frame period being divided into the transmission period and a non-transmission period, and the frame period requiring an increase in the data rate during the transmission period to compensate for the loss of data transmission during the non-transmission period, the device comprising:a demultiplexer for separating frame data in the frame period into first data and second data; a first spreader for spreading the first data by a first orthogonal code and generating a first spread signal; a second spreader for spreading the second data by a second orthogonal code and generating a second spread signal; a PN spreader for spreading the first and second spread signals by respective PN codes in the transmission period to generate a handoff frame signal; and a transmitter for transmitting the handoff frame signal, wherein the first orthogonal code and the second orthogonal code are mutually orthogonal with each other and are in the same hierarchical layer, and wherein a mobile station (MS) searches for an adjacent base station (BS) to which a call is handed off in the non-transmission period in the frame period.