Example embodiments presented herein are directed towards a user equipment, and corresponding methods therein, for handling a cell change from a first cell to a second cell in a wireless communications network. Some example embodiments may also be directed towards the user equipment altering a duration of a measurement time over which at least one measurement is performed, and altering a measurement bandwidth of the at least one measurement. The alterations may be performed based on associated bandwidths of the first and second cells. Other example embodiments may be directed towards a network node, and corresponding method therein, for sending, to the user equipment, a notification of a cell change and information associated with the cell change. Example embodiments may further comprise the network node receiving measurement data of at least one measurement performed over an altered measurement bandwidth and an altered duration of measurement time, where the alterations are based on the information associated with the cell change.

A method for providing a cooperative communication service by a macro Base Station (BS) in a mobile communication system is provided. The method includes generating at least one small cell BS group by grouping small cell BSs if there are small cell BSs of which a number is equal to or larger than a threshold small cell BS number within a service coverage of the macro BS, establishing a cooperative interface with a representative small cell BS among small cell BSs included in the at least one small cell BS group, and providing a cooperative communication service with the at least one small cell BS group using the cooperative interface.

Radio link Failure (RLF) reporting operation in a wireless communication system using multiple cells is disclosed. According to this operation, when a first cell and a second cell are simultaneously connected to a UE and the first cell and the second cell are of different base stations (a first base station and a second base station respectively), if the RLF with the UE on the first cell is detected by the first base station, the first base station may transmits an indication of the RLF with the UE on the first cell to the second base station.

Radio link Failure (RLF) reporting operation in a wireless communication system using multiple cells is disclosed. According to this operation, when a first cell and a second cell are simultaneously connected to a UE and the first cell and the second cell are of different base stations (a first base station and a second base station respectively), if the RLF with the UE on the first cell is detected by the first base station, the first base station may transmits an indication of the RLF with the UE on the first cell to the second base station.

A wireless device receives configuration parameters of a secondary physical uplink control channel (PUCCH) group. The secondary PUCCH group comprises: a PUCCH secondary cell; and a secondary cell. The wireless device receives, during a first time interval, a command activating the secondary cell. The wireless device starts transmission of channel state information for the secondary cell from a second time interval that is a positive number plus a pre-determined number of time intervals after the first time interval. In response to activation of the PUCCH secondary cell being completed in or after the pre-determined number of time intervals after the first time interval, the positive number is based on when activation of the PUCCH secondary cell is completed.

A wireless device receives configuration parameters of a secondary physical uplink control channel (PUCCH) group. The secondary PUCCH group comprises: a PUCCH secondary cell; and a secondary cell. The wireless device receives, during a first time interval, a command activating the secondary cell. The wireless device starts transmission of channel state information for the secondary cell from a second time interval that is a positive number plus a pre-determined number of time intervals after the first time interval. In response to activation of the PUCCH secondary cell being completed in or after the pre-determined number of time intervals after the first time interval, the positive number is based on when activation of the PUCCH secondary cell is completed.

Embodiments of the present invention provide a communication method, which includes: requesting, by a first base station, a second base station to add a cell of the second base station as a serving cell of first user equipment; when finding that a first identifier of the first user equipment is the same as an identifier of second user equipment served by the second base station, indicating, by the second base station to the first base station, that the first identifier is the same as the second identifier; and adjusting, by the first base station, the first identifier to a third identifier, and sending the third identifier to the second base station.

Embodiments of the present invention provide a communication method, which includes: requesting, by a first base station, a second base station to add a cell of the second base station as a serving cell of first user equipment; when finding that a first identifier of the first user equipment is the same as an identifier of second user equipment served by the second base station, indicating, by the second base station to the first base station, that the first identifier is the same as the second identifier; and adjusting, by the first base station, the first identifier to a third identifier, and sending the third identifier to the second base station.

Method and apparatus, performed autonomously in a user equipment (UE), for autonomous handover to a target cell of a radio access network (RAN). The method comprises determining, by the UE, an identity of the target cell; receiving, by the UE, a precise time reference broadcast by the target cell, the precise time reference indicating an elapsed time from a predetermined epoch; deriving, by the UE, an uplink timing adjustment based at least in part on the precise time reference, the uplink timing adjustment establishing uplink communication synchronization with the target cell; and transmitting, by the UE, an uplink signal to the target cell in accordance with the derived uplink timing adjustment.

Method and apparatus, performed autonomously in a user equipment (UE), for autonomous handover to a target cell of a radio access network (RAN). The method comprises determining, by the UE, an identity of the target cell; receiving, by the UE, a precise time reference broadcast by the target cell, the precise time reference indicating an elapsed time from a predetermined epoch; deriving, by the UE, an uplink timing adjustment based at least in part on the precise time reference, the uplink timing adjustment establishing uplink communication synchronization with the target cell; and transmitting, by the UE, an uplink signal to the target cell in accordance with the derived uplink timing adjustment.