Method and apparatus for reporting feedback information for multi-carrier operation
Method and apparatus for reporting feedback information for multi-carrier operation are disclosed. A wireless transmit/receive unit (WTRU) is configured with multiple carriers. A base station may allocate an uplink (UL) control channel associated with a single UL carrier, for the WTRU. The base station may transmit, to the WTRU, a plurality of data signals via at least two downlink (DL) carriers using orthogonal frequency division multiple access (OFDMA) and multiple input multiple output (MIMO), and may receive from the WTRU hybrid automatic repeat request (HARQ) acknowledgment/negative-acknowledgement (ACK/NACK) information, for the plurality of data signals transmitted via the at least two DL carriers, on the UL control channel. The HARQ ACK/NACK information may include at least two HARQ ACK/NACKs ANDed together. In addition, the base station may transmit, to the WTRU, information including a set of the DL carriers, each having an associated three bit indicator, for DL data transmission.
1. A method for use in a base station, the method comprising:
allocating, by the base station, uplink (UL) control channel resources associated with one UL carrier, for a wireless transmit/receive unit (WTRU);
transmitting, by the base station to the WTRU, an indicator, within downlink (DL) physical control signaling, of the allocated UL control channel resources associated with the one UL carrier;
transmitting, by the base station to the WTRU, a plurality of data signals using at least two DL carriers using orthogonal frequency division multiple access (OFDMA); and
receiving, by the base station from the WTRU, hybrid automatic repeat request (HARQ) acknowledgment/negative-acknowledgement (ACK/NACK) information, for the plurality of data signals transmitted via the at least two DL carriers, using the allocated UL control channel resources, associated with the one UL carrier, indicated by the indicator.
2. The method of claim 1 , further comprising transmitting, by the base station to the WTRU, information including a set of the DL carriers for DL data transmission, wherein each of the DL carriers of the set has an associated three bit indicator.
3. The method of claim 2 , further comprising receiving, by the base station, feedback information from the WTRU on the allocated UL control channel resources associated with the one UL carrier, wherein the feedback information is derived using the three bit indicators for the DL carriers.
4. The method of claim 1 , wherein the base station is an LTE-Advanced base station.
5. The method of claim 1 , wherein the base station is an 802.16m base station.
6. The method of claim 1 , further comprising:
receiving, by the base station, on the allocated UL control channel resources associated with the one UL carrier, from the WTRU, a NACK for one of the plurality of data signals transmitted via the at least two DL carriers; and
retransmitting, by the base station to the WTRU, the data signal via at least one DL carrier of the at least two DL carriers.
7. The method of claim 1 , wherein the HARQ ACK/NACK information includes at least two HARQ ACK/NACKs logically ANDed together for each of the at least two DL carriers.
8. A base station comprising:
a processor configured to allocate uplink (UL) control channel resources associated with one UL carrier, for a wireless transmit/receive unit (WTRU);
a transceiver operatively coupled to the processor, the transceiver and the processor configured to transmit, to the WTRU, an indicator, within downlink (DL) physical control signaling, of the allocated UL control channel resources associated with the one UL carrier;
the transceiver and the processor configured to transmit, to the WTRU, a plurality of data signals using at least DL carriers using orthogonal frequency division multiple access (OFDMA); and
the transceiver configured to receive, from the WTRU, hybrid automatic repeat request (HARQ) acknowledgment/negative-acknowledgement (ACK/NACK) information, for the plurality of data signals transmitted via the at least two DL carriers, using the allocated UL control channel resources, associated with the one UL carrier, indicated by the indicator.
9. The base station of claim 8 , wherein the processor and the transceiver are further configured to transmit, to the WTRU, information including a set of the DL carriers for downlink data transmission, wherein each of the DL carriers of the set has an associated three bit indicator.
10. The base station of claim 9 , wherein the transceiver is further configured to receive feedback information from the WTRU on the allocated UL control channel resources associated with the one UL carrier, wherein the feedback information is derived using the three bit indicators for the DL carriers.
11. The base station of claim 8 , wherein the base station is an LTE-Advanced base station.
12. The base station of claim 8 , wherein the base station is an 802.16m base station.
13. The base station of claim 8 , wherein:
the transceiver is further configured to receive, on the allocated UL control channel resources associated with the one UL carrier, from the WTRU, a NACK for one of the plurality of data signals transmitted via the at least two DL carriers; and
the processor and the transceiver are further configured to retransmit, to the WTRU, the data signal via at least one DL carrier of the at least two DL carriers.
14. The base station of claim 8 , wherein the HARQ ACK/NACK information includes at least two HARQ ACK/NACKs logically ANDed together for each of the at least two DL carriers.
15. A wireless transmit/receive unit (WTRU) comprising:
a transceiver configured to receive an indicator, within downlink (DL) physical control signaling, of allocated uplink (UL) control channel resources associated with one UL carrier;
the transceiver configured to receive a plurality of data signals using at least two DL carriers using orthogonal frequency division multiple access (OFDMA); and
a processor operatively coupled to the transceiver, the processor and the transceiver configured to transmit hybrid automatic repeat request (HARQ) acknowledgment/negative-acknowledgement (ACK/NACK) information, for the plurality of data signals received via the at least two DL carriers, using the allocated UL control channel resources associated with the one UL carrier, based on the indicator.
16. The WTRU of claim 15 , wherein the processor and the transceiver are further configured to receive information including a set of the DL carriers for downlink data transmission, wherein each of the DL carriers of the set has an associated three bit indicator.
17. The WTRU of claim 16 , wherein the processor and the transceiver are further configured to transmit feedback information on the allocated UL control channel resources associated with the one UL carrier, wherein the feedback information is derived using the three bit indicators for the DL carriers.
18. The WTRU of claim 15 , wherein the WTRU is an LTE-Advanced WTRU.
19. The WTRU of claim 15 , wherein the WTRU is an 802.16m WTRU.
20. The WTRU of claim 15 , wherein:
the processor and the transceiver are further configured to transmit on the allocated UL control channel resources associated with the one UL carrier, a NACK for one of the plurality of data signals received via the at least two DL carriers; and
the receiver is further configured to re-receive the data signal via at least one DL carrier of the at least two DL carriers.
21. The WTRU of claim 15 , wherein the HARQ ACK/NACK information includes at least two HARQ ACK/NACKs logically ANDed together for each of the at least two DL carriers.