Method and apparatus for performing and reporting measurements by user equipment configured with multiple carriers in mobile communication systems
摘要
說明書
After that, ENB 1603 informs UE 1601 of SCells to be activated/deactivated from among the SCells configured the UE 1601, by using Activation/Deactivation MAC Control Element (CE), at the Pth sub-frame, in operation 1613. The Activation/Deactivation MAC CE refers to an MAC CE that has a fixed size of 8 bits and includes seven C fields and one R field. The R field is a reserved filed. The seven C fields are expressed by Ci (e.g., C7, C6, C5, C4, C3, C2, C1). When the identifier i of SCell is set to ‘1,’ ENB informs UE of activation for the secondary carriers. When the identifier i of SCell is set to ‘0,’ ENB informs UE of deactivation for the secondary carriers. The i refers to an identifier indicating a sub-carrier and is integers between 1 and 7. Each time a new sub-carrier is set, the ENB informs the UE of identifier i along with the subcarrier information. Although the embodiment is described in such a way that the number of C fields is seven, it should be understood that the number of C fields can increase in proportion to the increase in the number of serving cells or carriers which are supported.
UE 1601 is capable of identifying SCells to be activated or deactivated according to the received CE in operation 1615. When a specific SCell is activated, UE 1601 identifies the third time point in operation 1617. The third time point is P+o sub-frame, where o is integers greater than or equal to one (e.g., o=8). The second time point is set to the same value as the first time point. After that, the UE 1601 is capable of performing third operations to be executed before P+o sub-frame as the second time point in operation 1619. Examples of the third operation are as follows. The following operations are not related to the interactions between UE and ENB, so that UE does not need to stop the operations at a preset time point.
