Uplink transmission based on a hybrid retransmission request (HARQ) process and a new data indicator (NDI)
A wireless device generates a first transport block (TB) in response to receiving a first downlink control information (DCI). The first DCI indicates: a hybrid retransmission request (HARQ) identifier; and a new data identifier (NDI). In response to not detecting a second DCI during a validation duration: the first DCI is invalidated; and transmission of the first TB is dropped. In response to receiving a third DCI indicating a same value of the HARQ identifier, uplink signals are transmitted. The uplink signals comprise, based on the NDI, one of: an adaptive-retransmission of the first TB; or a new transmission of a second TB.
1. A method comprising:
generating, by a wireless device, first transport block (TB), in response to receiving a first downlink control information (DCI), the first DCI indicating:
a hybrid retransmission request (HARQ) identifier; and
a new data identifier (NDI);
in response to not detecting a second DCI during a validation duration:
invalidating the first DCI; and
dropping transmission of the first TB; and
in response to receiving a third DCI indicating a same value of the HARQ identifier, transmit uplink signals comprising, based on the NDI, one of:
an adaptive-retransmission of the first TB; or
a new transmission of a second TB.
2. The method of claim 1 , wherein the first DCI comprises:
a first trigger field indicating that an uplink grant of the first DCI is triggered in response to the second DCI, the second DCI comprising a second trigger; and
a validation field indicating the validation duration for receiving the second DCI validating the first DCI.
3. The method of claim 2 , further comprising monitoring for the second DCI during at least a portion of the validation duration.
4. The method of claim 3 , wherein the monitoring for the second DCI is performed on a common search space of a control channel.
5. The method of claim 4 , further comprising receiving, by the wireless device, at least one message comprising configuration parameters of a plurality of cells comprising a licensed assisted access cell.
6. The method of claim 5 , wherein the second DCI corresponds to a pre-defined radio network temporary identifier (RNTI).
7. The method of claim 6 , wherein the second DCI comprises:
a subframe format field indicating a subframe format; and
a subframe field indicating a subframe offset.
8. The method of claim 7 , wherein the first DCI further comprises a resource block assignment field indicating a resource block assignment for uplink transmission on a cell.
9. The method of claim 8 , wherein the third DCI comprises:
a second NDI field; and
a second resource block assignment field indicating a second resource block assignment.
10. The method of claim 2 , further comprising monitoring for the second DCI on a common search space of a control channel.
11. A method comprising:
generating, by a medium access control (MAC) entity of a wireless device, a first transport block (TB) in response receiving a first downlink control information (DCI); and
in response to not detecting a second DCI during a validation duration:
invalidating the first DCI;
dropping transmission of the first TB; and
considering, by the MAC entity, that the transmission of the first TB to have been performed anyway.
12. The method of claim 11 , wherein the first DCI comprises:
a hybrid retransmission request (HARQ) identifier; and
a new data identifier (NDI) field.
13. The method of claim 12 , wherein the first DCI further comprises:
a first trigger field indicating that an uplink grant of the first DCI is triggered in response to the second DCI, the second DCI comprising a second trigger; and
a validation field indicating the validation duration for receiving the second DCI validating the first DCI.
14. The method of claim 13 , further comprising monitoring for the second DCI during at least a portion of the validation duration.
15. The method of claim 14 , wherein the monitoring for the second DCI is performed on a common search space of a control channel.
16. The method of claim 15 , wherein the second DCI corresponds to a pre-defined radio network temporary identifier (RNTI).
17. The method of claim 16 , wherein the second DCI comprises:
a subframe format field indicating a subframe format; and
a subframe field indicating a subframe offset.
18. The method of claim 17 , wherein the first DCI further comprises a resource block assignment field indicating a resource block assignment for uplink transmission on a cell.
19. The method of claim 18 , further comprising, based on the MAC entity considering that the transmission of the one or more first TBs to have been performed:
storing the HARQ identifier and the NDI; and
storing the one or more first TBs in a HARQ buffer.
20. A system comprising:
a base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors of the base station, cause the base station to transmit:
a first downlink control information (DCI); and
a third DCI; and
a wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors of the wireless device, cause the wireless device to:
generate a first transport block (TB) in response to receiving the first DCI, the first DCI indicating:
a hybrid retransmission request (HARQ) identifier; and
a new data identifier (NDI);
in response to not detecting a second DCI during a validation duration:
invalidating the first DCI; and
dropping transmission of the first TB; and
in response to receiving the third DCI indicating a same value of the HARQ identifier, transmit uplink signals comprising, based on the NDI, one of:
an adaptive-retransmission of the first TB; or
a new transmission of a second TB.