Uplink control information transmission methods for carrier aggregation
A method and apparatus for transmitting uplink control information (UCI) for Long Term Evolution-Advanced (LTE-A) using carrier aggregation is disclosed. Methods for UCI transmission in the uplink control channel, uplink shared channel or uplink data channel are disclosed. The methods include transmitting channel quality indicators (CQI), precoding matrix indicators (PMI), rank indicators (RI), hybrid automatic repeat request (HARQ) acknowledgement/non-acknowledgement (ACK/NACK), channel status reports (CQI/PMI/RI), source routing (SR) and sounding reference signals (SRS). In addition, methods for providing flexible configuration in signaling UCI, efficient resource utilization, and support for high volume UCI overhead in LTE-A are disclosed.
1. A method for transmitting uplink control information with carrier aggregation, comprising:
determining at least one uplink component carrier and at least two downlink component carriers;
encoding uplink control information (UCI) associated with the at least two downlink component carriers, wherein the UCI associated with the at least two downlink component carriers is jointly coded;
mapping the jointly coded UCI associated with the at least two downlink component carriers to resource blocks that are used for reporting carrier aggregation based uplink control information; and
transmitting the mapped UCI on physical uplink control channel (PUCCH) carried by a single uplink component carrier of the at least one uplink component carrier.
2. The method as in claim 1 , wherein the at least one uplink component carrier is configured by a base station.
3. The method as in claim 1 , wherein the at least one uplink component carrier is signaled by at least one of radio resource controller signaling, higher layer signaling, or L1 signaling.
4. The method as in claim 1 , wherein the at least one uplink component carrier is selected by a wireless transmit/receive unit (WTRU).
5. The method as in claim 1 , further comprising allocating different sets of resource blocks for different sequence lengths.
6. The method as in claim 1 , wherein different data symbols are spread with same cyclic shifts and mapped on different sets of resource blocks.
7. The method as in claim 1 , wherein different data symbols are spread with different cyclic shifts and mapped on same sets of resource blocks.
8. The method as in claim 1 , wherein different data symbols are spread with different cyclic shifts and mapped on different sets of resource blocks.
9. The method as in claim 1 , wherein a power-limited wireless transmit/receive unit (WTRU) uses an adaptive transmission scheme that restricts the amount of UCI being transmitted.
10. The method as in claim 1 , wherein a power-limited wireless transmit/receive unit (WTRU) uses an adaptive transmission scheme that uses more than one subframe to transmit the UCI.
11. The method as in claim 1 , wherein the carrier aggregation based resource blocks transmitted on the PUCCH are allocated to WTRUs for reporting carrier aggregation based control information.
12. The method as in claim 11 , wherein the UCI corresponds to hybrid automatic repeat request (HARQ) feedback for the at least two downlink component carriers.
13. A wireless transmit receive/unit (WTRU) comprising a transceiver operably connected to a processor, the processor configured to:
determine at least one uplink component carrier and at least two downlink component carriers;
encode uplink control information (UCI) associated with the at least two downlink component carriers, wherein the UCI associated with the at least two downlink component carriers is jointly coded;
map the jointly coded UCI associated with the at least two downlink component carriers to resource blocks that are used for reporting carrier aggregation based uplink control information; and
the transceiver configured to transmit the mapped UCI on physical uplink control channel (PUCCH) carried by a single uplink component carrier of the at least one uplink component carrier.
14. The WTRU as in claim 13 , wherein the UCI corresponds to at least hybrid automatic repeat request (HARQ) feedback for the at least two downlink component carriers.
15. The WTRU as in claim 13 , wherein the at least one uplink component carrier is configured by a base station.
16. The WTRU as in claim 13 , wherein the at least one uplink component carrier is signaled by at least one of radio resource controller signaling, higher layer signaling, or L1 signaling.
17. The WTRU as in claim 13 , wherein the processor is configured to allocate different sets of resource blocks for different sequence lengths.
18. The WTRU as in claim 13 , wherein different data symbols are spread with same or different cyclic shifts and mapped on same or different sets of resource blocks.
19. The WTRU as in claim 13 , wherein a power-limited WTRU uses an adaptive transmission scheme that restricts the amount of UCI being transmitted.
20. The WTRU as in claim 13 , wherein a power-limited WTRU uses an adaptive transmission scheme that uses more than one subframe to transmit the UCI.
21. The WTRU as in claim 13 , wherein the carrier aggregation based resource blocks transmitted on the PUCCH are allocated to WTRUs for reporting carrier aggregation based control information.
22. The WTRU as in claim 21 , wherein the UCI corresponds to hybrid automatic repeat request (HARQ) feedback for the at least two downlink component carriers.