METHOD AND APPARATUS FOR OBTAINING UPLINK TIMING ALIGNMENT ON A SECONDARY CELL

摘要

A method for uplink timing alignment in a wireless transmit/receive unit. The method includes receiving control signaling from an evolved Node B, receiving a message for Random Access Channel on a secondary cell, and completing the RACH upon receipt of the message, wherein the message includes a medium access control (MAC) control element with at least an 11-bit time advance command.