means of an activation deactivation mac ce without utilization of another activation deactivation mac ce thereafter whenever the enb 403 allocates downlink or uplink resources to the scell through the physical downlink control channel pdcch the user equipment 401 restarts the first timer at step 411 whenever an activation deactivation mac ce indicating reactivation of the scell is received from the enb 403 the user equipment 401 restarts the first timer at step 413 for example the first timer is a timer lasting for a time corresponding to m frames the first timer may be set by means of a radio resource control rrc layer message when downlink or uplink resources are not allocated to the scell and an activation deactivation mac ce indicating reactivation of the scell is not received before expiration of the first timer the user equipment 401 starts a second timer for the scell without immediate deactivation of the scell at step 415 the second timer is used to allow a time for the user equipment 401 to discontinue transmission of sounding reference signals srs for the scell and transmission of a channel quality indicator cqi a precoding matrix index pmi a rank indicator ri a precoder type indication pti so as not to disrupt normal operations of the enb 403 by deactivating the scell at the time of expiration of the second timer the cqi pmi ri pti is described in more detail below cqi corresponds to a recommended transport format satisfying a bit error rate of 10 percent pmi corresponds to an index for closed.