Fast control channel feedback for multiple downlink carrier operations
A method and apparatus for fast control channel feedback for multiple downlink carrier operations are disclosed. A wireless transmit/receive unit (WTRU) receives signals over a plurality of downlink carriers, generates feedback for each of the plurality of downlink carriers based on the received signals, and transmits via a plurality of antennas, the feedback for at least one of the plurality of downlink carriers over a first physical channel and feedback for another of the plurality of downlink carriers over a second physical channel.
1. A wireless transmit/receive unit (WTRU) configured for communication via a primary serving cell, a first secondary serving cell, and a second secondary serving cell, the WTRU comprising:
a receiver configured to receive information on the primary serving cell, a first HS-DSCH signal on the first secondary serving cell, and a second HS-DSCH signal on the second secondary serving cell;
circuitry configured to generate a first HARQ-ACK feedback relating to the first HS-DSCH signal and a second HARQ-ACK feedback relating to the second HS-DSCH signal; and
a transmitter configured to transmit the first HARQ-ACK feedback and the second HARQ-ACK feedback over a single uplink carrier, wherein the first HARQ-ACK feedback and the second HARQ-ACK feedback are combined into a HS-DPCCH and transmitted with a spreading factor of 128.
2. The WTRU of claim 1 , wherein the circuitry is further configured to generate a first CQI relating to the first HS-DSCH signal and a second CQI relating to the second HS-DSCH signal.
3. The WTRU of claim 2 , wherein the transmitter is further configured to transmit the first CQI and the second CQI over the single uplink carrier.
4. The WTRU of claim 3 , wherein the first CQI and the second CQI are combined into the HS-DPCCH.
5. The WTRU of claim 1 , wherein the combining comprises time-multiplexing the first HARQ-ACK feedback and the second HARQ-ACK feedback.
6. The WTRU of claim 1 , wherein the combining comprises concatenating the first HARQ-ACK feedback and the second HARQ-ACK feedback.
7. The WTRU of claim 1 , wherein the circuitry is configured to generate a state reduction, wherein the state reduction maps actual hybrid automatic repeat request-acknowledgement states to reported hybrid automatic repeat request-acknowledgement states of a smaller set.
8. The WTRU of claim 1 , wherein the receiver is configured to receive a third HS-DSCH signal on a third secondary serving cell and a fourth HS-DSCH signal on the primary serving cell; and
wherein the first HARQ-ACK feedback relates to the first HS-DSCH signal and the fourth HS-DSCH signal, and the second HARQ-ACK feedback relates to the second HS-DSCH signal and the third HS-DSCH signal.
9. A method for communicating via a primary serving cell, a first secondary serving cell, and a second secondary serving cell implemented in a wireless transmit/receive unit (WTRU), the method comprising:
receiving information on the primary serving cell, a first HS-DSCH signal on the first secondary serving cell, and a second HS-DSCH signal on the second secondary serving cell;
generating a first HARQ-ACK feedback relating to the first HS-DSCH signal and a second HARQ-ACK feedback relating to the second HS-DSCH signal; and
transmitting the first HARQ-ACK feedback and the second HARQ-ACK feedback over a single uplink carrier, wherein the first HARQ-ACK feedback and the second HARQ-ACK feedback are combined into a HS-DPCCH and transmitted with a spreading factor of 128.
10. The method of claim 9 , further comprising generating a first CQI relating to the first HS-DSCH signal and a second CQI relating to the second HS-DSCH signal.
11. The method of claim 10 , further comprising transmitting the first CQI and the second CQI over the single uplink carrier.
12. The method of claim 11 , wherein the first CQI and the second CQI are combined into the HS-DPCCH.
13. The method of claim 9 , wherein the combining comprises concatenating the first HARQ-ACK feedback and the second HARQ-ACK feedback.
14. The method of claim 9 , further comprising generating a state reduction, wherein the state reduction maps actual hybrid automatic repeat request-acknowledgement states to reported hybrid automatic repeat request-acknowledgement states of a smaller set.
15. The method of claim 9 , further comprising:
receiving a third HS-DSCH signal on a third secondary serving cell and a fourth HS-DSCH signal on the primary serving cell; and
wherein the first HARQ-ACK feedback relates to the first HS-DSCH signal and the fourth HS-DSCH signal, and the second HARQ-ACK feedback relates to the second HS-DSCH signal and the third HS-DSCH signal.
16. The method of claim 9 , wherein the combining comprises time-multiplexing the first HARQ-ACK feedback and the second HARQ-ACK feedback.