Method and apparatus for cell switching

摘要

Disclosed are a method and an apparatus for transmitting data. A cell switching method can comprise the steps of: allowing a primary (P)-cell base station to enable a first secondary (S)-cell; allowing the P-cell base station to receive channel state information from a second S-cell; allowing the P-cell base station to determine the second S-cell as a switching S-cell on the basis of the channel state information; allowing the P-cell base station to disable the first S-cell and enable the second S-cell.

主权项

1. A method for performing a cell switching in a wireless communication system, the method comprising:
activating, by a base station of a primary (P)-cell, a first secondary (S)-cell; receiving, by the base station of the P-cell, channel state information from a second S-cell; determining, by the base station of the P-cell, the second S-cell as a switching S-cell based on the channel state information; and deactivating, the base station of the P-cell, the first S-cell; activating, by the base station of the P-cell, the second S-cell; and configuring, by the base station of the P-cell, a transmission of a switching random access preamble as uplink data transmitted to the first S-cell by a wireless device, wherein the switching random access preamble is configured to be transmitted by the wireless device in order to perform the cell switching of the base station of the P-cell, wherein the wireless device determines whether to perform the cell switching based on the switching random access preamble, wherein the first S-cell and the second S-cell are included in an S-cell group, wherein the S-cell group is a set of a plurality of S-cells for which an identical physical cell identifier is configured and operated based on an identical center frequency, wherein the channel state information includes information of a channel which is obtained by overhearing the uplink data that the wireless device transmits to the first S-cell by the second S-cell, wherein the P-cell, the first S-cell and the second S-cell are aggregated by a carrier aggregation, and wherein the first S-cell and the second S-cell are activated by the P-cell.