The second set of carriers have different frequencies from the first set of carriers.

The desired number of carriers on which to transmit data is compared with the number of carriers in the subset of active carriers.

A set of component carriers is identified.

Data is selectively transmitted over one or more carriers of a set of carriers.

A set of carriers available for use in carrier aggregation is first determined.

Switching of UL and/or DL carriers may be from one component carrier or a subset of carriers to another component carrier, another subset of carriers, or all carriers in the same direction.

The congestion identifier is associated with a set of bearers.

The sub-set of bearers is less than or equal to a total number of bearers associated with the wireless terminal.

The apparatus furthermore comprises a carrier subset selector (331) for selecting a subset of carriers in the frequency band to be measured by the subscriber unit.

In some cases, a number of component carriers in the subset of the set of component carriers is equal to 1.

Additionally, the method includes transmitting the first group of encoded bits on a first set of carriers and transmitting the second group of encoded bits on a second set of carriers.

Communication reestablishment is intitiated using the second set of radio bearers (RB1).

The subset of carriers is selected dependent on the measuring performance characteristic.

The subset of active carriers is dynamically adjusted based on the comparison and subsequent data is transmitted over the wireless communication network using the adjusted subset of active carriers.

A wireless terminal communicates with a base station via a plurality of carriers and receives configuration data generated by the base station identifying a subset of carriers included in the plurality of carriers.