Method and apparatus for sending uplink control information for multi-radio access technology operation

Abstract

A method and apparatus for sending uplink control information by a multi-mode wireless transmit/receive unit (WTRU) capable of operating on multiple component carriers of a plurality of radio access technologies (RATs) for multi-RAT operation are disclosed. The WTRU may generate uplink control information (UCI) pertaining to a first RAT and a second RAT, wherein the UCI may include a first plurality of hybrid automatic repeat request acknowledgements (HARQ-ACKs) pertaining to a plurality of downlink (DL) transmissions of the first RAT and a second plurality of HARQ-ACKs pertaining to a plurality of DL transmissions of the second RAT. The WTRU may multiplex at least part of the generated UCI pertaining to the first RAT and at least part of the generated UCI pertaining to the second RAT onto a physical channel on a component carrier of the second RAT.

What is claimed is: 
     
         1 . A method for sending uplink control information by a multi-mode wireless transmit/receive unit (WTRU) capable of operating on multiple component carriers of a plurality of radio access technologies (RATs) for multi-RAT operation, the method comprising:
 generating, by the WTRU, uplink control information (UCI) pertaining to a first RAT and a second RAT, wherein the UCI includes a first plurality of hybrid automatic repeat request acknowledgements (HARQ-ACKs) pertaining to a plurality of downlink (DL) transmissions of the first RAT and a second plurality of HARQ-ACKs pertaining to a plurality of DL transmissions of the second RAT;   multiplexing, by the WTRU, at least part of the UCI pertaining to the first RAT and at least part of the UCI pertaining to the second RAT onto a physical layer channel on a component carrier of the second RAT; and   sending, by the WTRU, the physical layer channel via the second RAT to a base station.   
     
     
         2 . The method of  claim 1 , wherein a particular UCI is prioritized over another in accordance with a priority rule. 
     
     
         3 . The method of  claim 1 , wherein the second RAT is one of Long Term Evolution (LTE) or LTE-Advanced (LTE-A), and the physical layer channel is at least one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). 
     
     
         4 . The method of  claim 1 , wherein the first RAT operates on a first frequency and the second RAT operates on a second frequency. 
     
     
         5 . The method of  claim 4 , wherein the second frequency is a lower frequency than the first frequency. 
     
     
         6 . The method of  claim 1 , wherein the first UCI further includes at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indication (RI), a pre-coding control indication (PCI), a scheduling request (SR), an Enhanced Dedicated Channel (E-DCH) transport format combination indicator (E-TFCI), a happy bit, and a retransmission sequence number (RSN); and
 wherein the second UCI further includes at least one of a CQI, a PMI, an RI, a PCI, an SR, an E-TFCI, a happy bit, and an RSN.   
     
     
         7 . The method of  claim 1 , further comprising:
 determining a type of UCI to be transmitted for each serving cell of the first RAT and each serving cell of the second RAT.   
     
     
         8 . A method for sending uplink control information by a multi-mode wireless transmit/receive unit (WTRU) capable of operating on multiple component carriers of a plurality of radio access technologies (RATs), the method comprising:
 determining, by the WRTU, a type of uplink control information (UCI) to be transmitted for each serving cell of a first RAT and a second RAT, wherein the UCI includes a first plurality of hybrid automatic repeat request acknowledgements (HARQ-ACKs) pertaining to a plurality of downlink (DL) transmissions in the serving cell of the first RAT and a second plurality of HARQ-ACKs pertaining to a plurality of DL transmissions in the serving cell of the second RAT;   generating, by the WTRU, UCI bits for each serving cell of the first RAT at a physical layer and each serving cell of the second RAT at the physical layer;   ordering, by the WTRU, the generated UCI bits in accordance with a predetermined ordering rule;   encoding, by the WTRU, the ordered UCI bits;   multiplexing, by the WTRU, the encoded UCI bits pertaining to the first RAT on a physical layer channel and the second RAT on the physical layer channel on at least one component carrier of at least one of the first RAT or the second RAT; and   transmitting, by the WTRU, the physical layer channel via the second RAT to a base station.   
     
     
         9 . The method of  claim 5 , wherein a particular UCI is prioritized over another in accordance with a priority rule. 
     
     
         10 . The method of  claim 5 , wherein the second RAT is one of Long Term Evolution (LTE) or LTE-Advanced (LTE-A), and the physical layer channel is at least one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). 
     
     
         11 . The method of  claim 5 , wherein the first RAT operates on a first frequency and the second RAT operates on a second frequency. 
     
     
         12 . The method of  claim 11 , wherein the second frequency is a lower frequency than the first frequency. 
     
     
         13 . The method of  claim 5 , wherein the first UCI further includes at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indication (RI), a pre-coding control indication (PCI), a scheduling request (SR), an Enhanced Dedicated Channel (E-DCH) transport format combination indicator (E-TFCI), a happy bit, and a retransmission sequence number (RSN); and
 wherein the second UCI further includes at least one of a CQI, a PMI, an RI, a PCI, an SR, an E-TFCI, a happy bit, and an RSN.   
     
     
         14 . A multi-mode wireless transmit/receive unit (WTRU) capable of operating on multiple component carriers of a plurality of radio access technologies (RATs) for multi-RAT operation, the WTRU comprising:
 a processor configured to generate uplink control information (UCI) pertaining to a first RAT at a physical layer and a second RAT at the physical layer, wherein the UCI includes a first plurality of hybrid automatic repeat request acknowledgements (HARQ-ACKs) pertaining to a plurality of downlink (DL) transmissions of the first RAT and a second plurality of HARQ-ACKs pertaining to a plurality of DL transmissions of the second RAT; multiplex at least part of the UCI pertaining to the first RAT and at least part of the UCI pertaining to the second RAT onto a physical layer channel on a component carrier of the second RAT, and send the physical layer channel via the second RAT to a base station.   
     
     
         15 . The WTRU of  claim 14 , wherein a particular UCI is prioritized over another in accordance with a priority rule. 
     
     
         16 . The WTRU of  claim 4 , wherein the second RAT is one of Long Term Evolution (LTE) or LTE-Advanced, and the physical layer channel is at least one of a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH). 
     
     
         17 . The WTRU of  claim 14 , wherein the first RAT operates on a first frequency and the second RAT operates on a second frequency. 
     
     
         18 . The WTRU of  claim 14 , wherein the processor is configured to determine a type of UCI to be transmitted for each serving cell of the first RAT and the second RAT. 
     
     
         19 . The WTRU of  claim 17 , wherein the second frequency is a lower frequency than the first frequency. 
     
     
         20 . The WTRU of  claim 14 , wherein the first UCI further includes at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indication (RI), a pre-coding control indication (PCI), a scheduling request (SR), an Enhanced Dedicated Channel (E-DCH) transport format combination indicator (E-TFCI), a happy bit, and a retransmission sequence number (RSN); and
 wherein the second UCI further includes at least one of a CQI, a PMI, an RI, a PCI, an SR, an E-TFCI, a happy bit, and an RSN.