SECONDARY CELL SYNCHRONIZATION

摘要

In an LTE-based wireless communication system, a mechanism is provided for allowing the information regarding the time/frequency synchronization of a second cell (22) to be transmitted to a terminal (10) from a first cell (20 or 21). This accurate time/frequency information sharing in this way is possible when the two cells are located close to each other. The purpose of such synchronization information sharing is that the second cell (22) can switch off its transmission of the normal signals for cell identification such as PSS/SSS/CRS if active, or discovery reference signal DRS when it is in the off mode. The terminal (10) will be able to obtain the synchronization information from the first cell (20 or 21). The terminal (10) may be instructed that it should derive the synchronization from that of the first cell, or to allow the first cell to convey directly the synchronization information to the terminal. The proposed invention allows terminals to synchronize with cells in off-mode, even when they are not transmitting signals such as the DRS.