METHOD AND APPARATUS FOR CROSS RETRANSMISSION BETWEEN GUL AND SUL
Provided herein are method and apparatus for cross retransmission between Grant-less Uplink transmission (GUL) and Scheduled Uplink transmission (SUL). An embodiment provides an apparatus for a user equipment (UE) comprising baseband circuitry including one or more processors to: encode an uplink (UL) transmission data for transmission to an evolved Node B (eNB) on an un-licensed spectrum; determine a mode of re-transmission for the UL transmission as a scheduled mode in which the re-transmission is based on a re-transmission grant derived from downlink control information (DCI) received from the eNB or a grant-less mode in which the re-transmission is performed without the re-transmission grant from the eNB; and encode the re-transmission of the UL transmission based on the determined mode. Also provided is hybrid automatic repeat request (HARQ) feedback for GUL and SUL. At least some embodiments allow for maximum channel occupancy time (MCOT) sharing.
1 .- 25 . (canceled)
26 . An apparatus for a user equipment (UE), comprising:
baseband circuitry including one or more processors to:
encode an uplink (UL) transmission data for transmission to an evolved Node B (eNB) on an unlicensed spectrum;
determine a mode of re-transmission for the UL transmission as one of: a scheduled mode in which the re-transmission is based on a re-transmission grant derived from downlink control information (DCI) received from the eNB, and a grant-less mode in which the re-transmission is performed without the re-transmission grant from the eNB; and
encode the re-transmission of the UL transmission based on the determined mode.
27 . The apparatus of claim 26 , wherein the baseband circuitry is further configured to:
decode a hybrid automatic repeat request (HARQ) feedback received from the eNB; and
determine the mode of re-transmission in response to the HARQ feedback indicating a negative acknowledgement (NACK) at the eNB of the UL transmission.
28 . The apparatus of claim 27 , wherein the baseband circuitry is to further:
determine the mode of re-transmission as the scheduled mode if a HARQ process number associated with the UL transmission falls outside of a predefined group.
29 . The apparatus of claim 28 , wherein baseband circuitry is to further:
decode dedicated or broadcast radio resource control (RRC) signaling to configure the group.
30 . The apparatus of claim 27 , wherein the HARQ feedback comprises a HARQ bitmap indicating acknowledgement (ACK) and NACK at the eNB for a plurality of UL transmissions associated with corresponding HARQ process numbers.
31 . The apparatus of claim 30 , wherein the baseband circuitry is to further:
encode another UL transmission data in response to the HARQ feedback indicating an ACK at the eNB of the UL transmission.
32 . The apparatus of claim 26 , wherein the baseband circuitry is to further:
start a timer upon finishing the UL transmission; and
determine the mode of re-transmission as the scheduled mode if the re-transmission grant is derived before expiration of the timer, and as the grant-less mode when the timer expires without the re-transmission grant.
33 . The apparatus of claim 32 , wherein the baseband circuitry is to further determine the mode of re-transmission as the grant-less mode when the timer expires without receiving a hybrid automatic repeat request (HARQ) feedback from the eNB.
34 . The apparatus of claim 27 , wherein the baseband circuitry is to further:
start a timer upon receiving the HARQ feedback; and
determine the mode of re-transmission as the scheduled mode if the re-transmission grant is derived before expiration of the timer, and as the grant-less mode when the timer expires without the re-transmission grant.
35 . The apparatus of claim 34 , wherein the timer is shared by a plurality of HARQ processes on the UE.
36 . The apparatus of claim 34 , wherein the timer is associated with a single HARQ process associated with the UL transmission.
37 . The apparatus of claim 26 , wherein the DCI is configured to assign to the UE a whole system bandwidth or one of a plurality of orthogonal resources.
38 . The apparatus of claim 26 , wherein the baseband circuitry is to further:
determine the mode of re-transmission as the scheduled mode if the eNB acquires a channel earlier than the UE, and as the grant-less mode if the UE acquires the channel earlier than the eNB.
39 . The apparatus of claim 26 , wherein the baseband circuitry is to further:
perform a clear channel assessment (CCA) before transmitting the UL transmission and before the re-transmission.
40 . The apparatus of claim 26 , wherein the baseband circuitry is to further:
encode the UL transmission data for transmission on physical uplink shared channel (PUSCH).
41 . The apparatus of claim 26 , wherein the baseband circuitry is to further:
encode the UL transmission data for transmission as a grant-less uplink (GUL) transmission.
42 . An apparatus for a user equipment (UE), comprising:
baseband circuitry including one or more processors to:
encode an uplink (UL) transmission to an evolved Node B (eNB) on an unlicensed spectrum;
start a timer upon finishing the UL transmission; and
when the timer expires without receiving a hybrid automatic repeat request (HARD) feedback from the eNB for the UL transmission, perform one of:
transmitting, as a new transmission, a packet same as the UL transmission, and
performing a re-transmission for the UL transmission.
43 . The apparatus of claim 42 , wherein the baseband circuitry is to further:
reset a HARQ process number associated with the UL transmission.
44 . The apparatus of claim 43 , wherein the baseband circuitry is to further:
make a predetermined number of attempts of the new transmission or the re-transmission before resetting the HARQ process number.
45 . An apparatus of an evolved Node B (eNB), comprising:
baseband circuitry, including one or more processors, to:
decode uplink (UL) transmission data received from user equipment (UE) on an unlicensed spectrum; and
encode a hybrid automatic repeat request (HARQ) feedback for the UE, wherein the HARQ feedback comprises a HARQ bitmap indicating acknowledgement (ACK) and negative acknowledgement (NACK) at the eNB for the UL transmissions associated with corresponding HARQ process numbers.
46 . The apparatus of claim 45 , wherein the baseband circuitry is to further:
encode downlink control information (DCI) for transmission to the UE to schedule a re-transmission of one or more of the UL transmission indicated as NACK in the HARQ bitmap.
47 . The apparatus of claim 45 , wherein the baseband circuitry is to further:
encode configuration data for the UE to configure the UE with a group of HARQ process numbers through dedicated or broadcast radio resource control (RRC) signaling, wherein if a UL transmission indicated as NACK is associated with a HARQ process number falling within the group, a re-transmission of the UL transmission can be performed without a re-transmission grant from the eNB.
48 . The apparatus of claim 45 , wherein the baseband circuitry is to further:
encode the HARQ feedback for transmission to the UE during a maximum channel occupancy time (MCOT) of a second UE different from the UE.
49 . The apparatus of claim 46 , wherein the DCI is to be transmitted to the UE during a maximum channel occupancy time (MCOT) of a second UE different from the UE.
50 . The apparatus of claim 46 , wherein the DCI is configured to assign to the UE a whole system bandwidth or one of a plurality of orthogonal resources.