Group acknowledgement/negative acknowledgement and triggering GACK/channel state information
According to the present disclosure, CSI and/or a plurality of ACKs related to a group of DL data transmissions may be buffered at the UE as a GACK until a DCI trigger is received from the eNB. Once the trigger is received, the UE may transmit the CSI and/or GACK to the eNB. In this way HARQ feedback and/or CSI may be reliably communicated while reducing payload. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus send, to a UE, data transmissions associated with a first plurality of downlink subframes. In an aspect, the apparatus increments a counter for each data transmission sent to the UE. In a further aspect, the apparatus transmits, to the UE, a first trigger for a first GACK when a counter is greater than or equal to a threshold.
1. A method of wireless communication, comprising: generating uplink control information (UCI), the UCI including at least one of a group acknowledgement/negative acknowledgement (GACK), a rank indicator (RI), or a channel state information (CSI) transmission; and sending a UCI transmission in a listen before talk (LBT) subframe, wherein the generating the UCI comprises coding and multiplexing the GACK, the RI, or the CSI separately when the UCI transmission is sent in an uplink data channel, and wherein the generating the UCI comprises coding the GACK, the RI, or the CSI jointly when the UCI transmission is sent in an uplink control channel.
2. The method of claim 1 , wherein: the uplink data channel is one of a physical uplink shared channel (PUSCH) or an enhanced PUSCH (ePUSCH), and the uplink control channel is one of a physical uplink control channel (PUCCH) or an enhanced PUCCH (ePUCCH).
3. The method of claim 1 , wherein the generating the UCI further comprises zero-padding the UCI to a predetermined size when the UCI transmission is sent in the uplink control channel.
4. The method of claim 1 , wherein when the UCI transmission includes the GACK transmission, a payload of the UCI transmission includes a number of hybrid automatic repeat request (HARQ) processes and a number of codewords.
5. The method of claim 1 , wherein when the UCI transmission includes the CSI transmission, a payload of the UCI transmission may include two or more jointly coded RI bits, channel quality indicator (CQI) bits, and precoding matrix indicator (PMI) bits.
6. The method of claim 1 , wherein the UCI comprises a scheduling request, a CQI a precoding matrix indicator (PMI), the RI, and hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) feedback.
7. The method of claim 1 , wherein when the UCI transmission is sent on the uplink control channel, a payload of the UCI transmission includes two or more jointly coded GACK bits, CSI bits, RI bits, channel quality indicator (CQI) bits, or precoding matrix indicator (PMI) bits.
8. The method of claim 1 , further comprising: receiving, in a LBT frame, a trigger for the UCI transmission; and sending the UCI transmission on the uplink control channel upon receipt of the trigger.
9. An apparatus for wireless communication, comprising: means for generating uplink control information (UCI), the UCI including at least one of a group acknowledgement/negative acknowledgement (GACK), a rank indicator (RI), or a channel state information (CSI) transmission; and means for sending a UCI transmission in a listen before talk (LBT) subframe, wherein the generating the UCI comprises coding and multiplexing the GACK, the RI, or the CSI separately when the UCI transmission is sent in an uplink data channel, and wherein the generating the UCI comprises coding the GACK, the RI, or the CSI jointly when the UCI transmission is sent in an uplink control channel.
10. The apparatus of claim 9 , wherein the uplink data channel is one of a physical uplink shared channel (PUSCH) or an enhanced PUSCH (ePUSCH), and the uplink control channel is one of a physical uplink control channel (PUCCH) or an enhanced PUCCH (ePUCCH).
11. The apparatus of claim 9 , wherein the generating the UCI further comprises zero-padding the UCI to a predetermined size when the UCI transmission is sent in the uplink control channel.
12. The apparatus of claim 9 , wherein when the UCI transmission includes the GACK transmission, a payload of the UCI transmission includes a number of hybrid automatic repeat request (HARQ) processes and a number of codewords.
13. The apparatus of claim 9 , wherein when the UCI transmission includes the CSI transmission, a payload of the UCI transmission may include two or more jointly coded RI bits, channel quality indicator (CQI) bits, and precoding matrix indicator (PMI) bits.
14. The apparatus of claim 9 , wherein the UCI comprises a scheduling request, a CQI a precoding matrix indicator (PMI), the RI, and hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) feedback.
15. The apparatus of claim 9 , wherein when the UCI transmission is sent on the uplink control channel, a payload of the UCI transmission includes two or more jointly coded GACK bits, CSI bits, RI bits, channel quality indicator (CQI) bits, or precoding matrix indicator (PMI) bits.
16. The apparatus of claim 9 , further comprising: means for receiving, in a LBT frame, a trigger for the UCI transmission; and means for sending the UCI transmission on the uplink control channel upon receipt of the trigger.
17. An apparatus for wireless communication, comprising: a memory; and at least one processor coupled to the memory and configured to: generating uplink control information (UCI), the UCI including at least one of a group acknowledgement/negative acknowledgement (GACK), a rank indicator (RI), or a channel state information (CSI) transmission; and sending a UCI transmission in a listen before talk (LBT) subframe, wherein the generating the UCI comprises coding and multiplexing the GACK, the RI, or the CSI separately when the UCI transmission is sent in an uplink data channel, and wherein the generating the UCI comprises coding the GACK, the RI, or the CSI jointly when the UCI transmission is sent in an uplink control channel.
18. The apparatus of claim 17 , wherein the uplink data channel is one of a physical uplink shared channel (PUSCH) or an enhanced PUSCH (ePUSCH), and the uplink control channel is one of a physical uplink control channel (PUCCH) or an enhanced PUCCH (ePUCCH).
19. The apparatus of claim 17 , wherein the generating the UCI further comprises zero-padding the UCI to a predetermined size when the UCI transmission is sent in the uplink control channel.
20. The apparatus of claim 17 , wherein when the UCI transmission includes the GACK transmission, a payload of the UCI transmission includes a number of hybrid automatic repeat request (HARQ) processes and a number of codewords.
21. The apparatus of claim 17 , wherein when the UCI transmission includes the CSI transmission, a payload of the UCI transmission may include two or more jointly coded RI bits, channel quality indicator (CQI) bits, and precoding matrix indicator (PMI) bits.
22. The apparatus of claim 17 , wherein the UCI comprises a scheduling request, a channel quality indicator (CQI) a precoding matrix indicator (PMI), the RI, and hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) feedback.
23. The apparatus of claim 17 , wherein when the UCI transmission is sent on the uplink control channel, a payload of the UCI transmission includes two or more jointly coded GACK bits, CSI bits, RI bits, channel quality indicator (CQI) bits, or precoding matrix indicator (PMI) bits.
24. The apparatus of claim 17 , wherein the at least one processor is further configured to: receive, in a LBT frame, a trigger for the UCI transmission; and send the UCI transmission on the uplink control channel upon receipt of the trigger.
25. A non-transitory computer-readable medium storing computer executable code, comprising code to: generate uplink control information (UCI), the UCI including a group acknowledgement/negative acknowledgement (GACK), a rank indicator (RI), or a channel state information (CSI) transmission; and send a UCI transmission in a listen before talk (LBT) subframe, wherein the generating the UCI comprises coding and multiplexing the GACK, RI, and CSI separately when the UCI transmission is sent in an uplink data channel, and wherein the generating the UCI comprises coding the GACK, RI, and CSI jointly when the UCI transmission is sent in an uplink control channel.
26. The non-transitory computer-readable medium of claim 25 , wherein: the uplink data channel is one of a physical uplink shared channel (PUSCH) or an enhanced PUSCH (ePUSCH), and the uplink control channel is one of a physical uplink control channel (PUCCH) or an enhanced PUCCH (ePUCCH).
27. The non-transitory computer-readable medium of claim 25 , wherein the generating the UCI further comprises zero-padding the UCI to a predetermined size when the UCI transmission is sent in the uplink control channel.
28. The non-transitory computer-readable medium of claim 25 , wherein when the UCI transmission includes the GACK transmission, a payload of the UCI transmission includes a number of hybrid automatic repeat request (HARQ) processes and a number of codewords.
29. The non-transitory computer-readable medium of claim 25 , wherein when the UCI transmission includes the CSI transmission, a payload of the UCI transmission may include two or more jointly coded RI bits, channel quality indicator (CQI) bits, and precoding matrix indicator (PMI) bits.
30. The non-transitory computer-readable medium of claim 25 , wherein the UCI comprises a scheduling request, a channel quality indicator (CQI) a precoding matrix indicator (PMI), the RI, and hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) feedback.