System and method for disabling hybrid automatic repeat request in internet of things-non-terrestrial network
Described are implementations for HARQ-disabling in IoT-NTN deployment AND disabling HARQ-ACK feedback. Signaling mechanisms include configurations for HARQ process ID(s), NPDCCH monitoring, a New Data Indicator (NDI) bit in Downlink Control Information (DCI), and a HARQ-ACK feedback transmission in the uplink.
1 . A method comprising:
configuring a base station to disable a Hybrid Automatic Repeat Request (HARQ) operation;
configuring the base station to send a Narrow-Band Physical Downlink Control Channel (NPDCCH) transmission immediately after a predetermined User Equipment (UE) processing delay;
configuring a UE to disable a HARQ-Acknowledgement (HARQ-ACK) feedback transmission; and
configuring the UE to flush a decoding buffer after a reception of each Narrow-Band Physical Downlink Shared Channel (NPDSCH) from the base station.
2 . The method of claim 1 , comprising:
configuring the UE to omit the HARQ-ACK feedback transmission in a Narrow-Band Physical Uplink Shared Channel (NPUSCH) format.
3 . The method of claim 1 , comprising
configuring the base station to reduce the predetermined UE processing delay to a reduced delay k 1 .
4 . The method of claim 3 , wherein the predetermined UE processing delay is 12 milliseconds, and the reduced delay k 1 is less than 12 milliseconds (0 ms-11 ms).
5 . The method of claim 1 , further comprising:
configuring the base station to send a New Data Indicator (NDI) bit configured to signal the UE to selectively enable or disable the HARQ-ACK feedback transmission;
configuring the UE to selectively enable or disable the HARQ-ACK feedback transmission based on the NDI bit signal.
6 . The method of claim 5 , further comprising:
the UE ignoring a value communicated by the NDI bit and treating all transmissions from the base station as a new transmission.
7 . The method of claim 5 , further comprising;
configuring the UE to enable and transmit the HARQ-ACK when the NDI equals 1; and
configuring the UE to disable and not transmit the HARQ-ACK when the NDI equals 0.
8 . The method of claim 1 , further comprising;
configuring the base station to perform a downlink (DL) budgeting operation based on the HARQ-ACK feedback transmission from the UE.
9 . An apparatus configured to be implemented in a Narrowband Information of Things, comprising:
a base station configured to disable a Hybrid Automatic Repeat Request (HARQ) operation and to send a Narrow-Band Physical Downlink Control Channel (NPDCCH) transmission immediately after a predetermined User Equipment (UE) processing delay, wherein a UE is configured to disable a HARQ-Acknowledgement (HARQ-ACK) feedback transmission;
the base station being configured to send a New Data Indicator (NDI) bit configured to signal the UE to selectively enable or disable the HARQ-ACK feedback transmission; and
the base station being configured to perform a downlink (DL) budgeting operation based on the HARQ-ACK feedback transmission from the UE.
10 . The apparatus of claim 9 , comprising:
the base station being configured reduce the predetermined UE processing delay to a reduced delay k 1 .
11 . The apparatus of claim 10 , wherein the predetermined UE processing delay i configured to be 12 milliseconds, and the reduced delay k 1 is configured to be less than 12 milliseconds.
12 . A User Equipment (UE) configured to be implemented in a Narrowband Information of Things, comprising:
the UE being configured to:
disable a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) feedback transmission in response to a base station configured to disable a HARQ operation and send a Narrow-Band Physical Downlink Control Channel (NPDCCH) transmission immediately after a predetermined UE processing delay; and
flush a decoding buffer after the reception of each Narrow-Band Physical Downlink Shared Channel (NPDSCH) from the base station.
13 . The apparatus of claim 12 , further comprising:
the UE being configured to omit the HARQ-ACK feedback transmission in a Narrow-Band Physical Uplink Shared Channel (NPUSCH) format.
14 . The apparatus of claim 12 , the UE being configured to:
receive a New Data Indicator (NDI) bit configured to enable or disable the HARQ-ACK feedback transmission from the base station; and
selectively enable or disable the HARQ-ACK feedback transmission based on the NDI bit.
15 . The apparatus of claim 14 , wherein the UE is configured to ignore a value communicated by the NDI bit and treat all transmissions from the base station as a new transmission.
16 . The apparatus of claim 14 , further comprising:
the UE being configured to enable and transmit the HARQ-ACK when the NDI equals 1; and
the UE being configured to disable and not transmit the HARQ-ACK when the NDI equals 0.