Carrier aggregation in wireless communications systems

摘要

Provided is a data transmission system using a carrier aggregation. The data transmission system may assign a radio resource based on a correspondence relationship between a downlink and an uplink, and may transmit data using the assigned radio resource.

主权项

1. A method for wireless communication method by a user equipment (UE), comprising:
multiplying a plurality of data symbols with a first scrambling sequence and a first orthogonal sequence; mapping the data symbols multiplied by the first scrambling sequence and the first orthogonal sequence to a first slot; multiplying a plurality of data symbols with a second scrambling sequence and a second orthogonal sequence; mapping the data symbols multiplied by the second scrambling sequence and the second orthogonal sequence to a second slot; and transmitting the first slot and the second slot to a base station, wherein the first slot includes five DFT-S-OFDM symbols to transmit the data symbols and the second slot includes four DFT-S-OFDM symbols to transmit the data symbols, wherein the first orthogonal sequence is selected from orthogonal sequences listed in Table 1 and the second orthogonal sequence is selected from orthogonal sequences listed in Table 2, and wherein the sequence index of the first orthogonal sequence is the same as the sequence index of the second orthogonal sequence.TABLE 1Sequence IndexDFT sequence0[1 1 1 1 1]1[1 ej2π/5 ej4π/5 ej6π/5 ej8π/5]2[1 ej4π/5 ej8π/5 ej12π/5 ej16π/5]3[1 ej6π/5 ej12π/5 ej18π/5 ej24π/5]TABLE 2Sequence IndexWalsh Sequence0[1 1 1 1]1[1 −1 1 −1]2[1 1 −1 −1]3[1 −1 −1 1].