Prohibition of Sounding Reference Signal Transmission on Newly Activated Secondary Cells

A wireless transceiver of a radio access terminal for use in a wireless communication system that supports uplink carrier aggregation, the wireless transceiver comprising:

• a radio circuit adapted to receive signals on at least one downlink carrier from a base station, and to transmit signals on a plurality of uplink carriers to the base station, the uplink carriers including an uplink-primary component carrier (PCC) and an uplink secondary component carrier (SCC);
• and
• a processing circuit operatively connected to the radio circuit and adapted to:
• transmit sounding reference signals (SRS) on the uplink PCC, using the radio circuit;
• receive an activation command corresponding to the uplink SCC, via the radio circuit;
• determine, in response to receiving the activation command, whether the wireless transceiver has valid timing information for the uplink SCC, wherein valid timing information for the uplink SCC indicates that the uplink SCC is uplink synchronized to the base station;
• and,
• in response to said determining, enable transmission of the SRS on the uplink SCC when the SRS is configured, if the uplink SCC is synchronized, and otherwise prohibit transmission of the SRS on the uplink SCC until the uplink SCC is uplink synchronized.