Some UEs may be configured with asymmetric CA in which a number of uplink carriers that is less than the number of downlink component carriers. For example, there may be multiple downlink component carriers, but only a single uplink component carrier. FIG. 6 is a block diagram illustrating carrier aggregation 600 configured asymmetrically in a TDD implementation. The transmission stream of FIG. 6 shows two radio frames, radio frames 602, 604, of a PCC 606 and SCC 608. PCC 604 is time division duplexed across its subframes to include downlink subframes, uplink subframes, and special (S) subframes SCC 608 is time division duplexed across its subframes to include downlink subframes, inactive uplink subframes for which the UE is not configured, and S subframes. Because the uplink subframes 2-3 and 7-8 of SCC 608 are inactive, the downlink subframes, subframes 0, 4-5, and 9, of SCC 608 are non-paired, and carrier aggregation 600 is considered to be asymmetric.
