Physical Uplink Control Channel Cells in a Communication Network Using Carrier Aggregation

A communication apparatus configured to adopt carrier aggregation for communication between a user equipment and a communication network, in which a number of component carriers corresponding to a number of serving cells are aggregated, and at least two physical uplink control channel (PUCCH) groups are configured, the at least two PUCCH groups comprising a first group and a second group, wherein the first group comprises a first cell of the number of serving cells, which is a primary serving cell, that carries a first PUCCH, and first serving cells of the number of serving cells, which use the first PUCCH, and the second group comprises a second cell of the number of serving cells, which is a secondary serving cell, that carries a second PUCCH, and second serving cells of the number of serving cells, which use the second PUCCH, the apparatus comprising at least one processor and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to perform:

• executing the communication using the first group and the second group;
• and
• in case a predetermined condition occurs, continuing the communication by exchanging the first group by the second group wherein the secondary serving cell that carries the second PUCCH becomes the primary serving cell and vice versa.