Flexible Semi-Static HARQ-ACK Codebook Overhead

Abstract

A method, apparatus, and a computer-readable storage medium are provided for constructing a HARQ-ACK codebook for managing the trade-off between codebook size and feedback granularity. In an example implementation, the method may include a network node determining a second time domain resource allocation table and transmitting configuration information to the UE. The method may further include the network node transmitting downlink data to the UE and receiving the one or more ACKs and/or NACKs from the UE in response to the transmitting of the downlink data, the one or more ACKs/NACKs being generated based at least on the second time resource allocation table. In another example implementation, the method may include a user equipment (UE) receiving configuration information from a network node, receiving downlink data from the network node, and transmitting one or more ACKs/NACKs to the network node.

What is claimed is: 
     
         1 . A method of communications, comprising:
 determining, by a network node, a second time domain resource allocation table, the second time domain resource allocation table being different from a first time domain resource allocation table, the first time domain resource allocation table used for indicating time domain resources allocated to a physical downlink shared channel for communications with a user equipment (UE) and the second time domain resource allocation table used for generating one or more hybrid automatic repeat request (HARQ) acknowledgements (ACKs) and/or negative ACKs (NACKs) by the UE;   transmitting, by the network node, configuration information to the UE, the configuration information indicating to the UE to use the second time domain resource allocation table for generating the one or more HARQ ACKs and/or NACKs;   transmitting, by the network node, downlink data to the UE; and   receiving, by the network node, the one or more ACKs and/or NACKs from the UE in response to the transmitting of the downlink data, the one or more ACKs/NACKs being generated based at least on the second time resource allocation table.   
     
     
         2 . The method of  claim 1 , wherein the second time domain resource allocation table is determined from at least the first time resource allocation table. 
     
     
         3 . The method of  claim 1 , further comprising:
 transmitting, by the network node, the first and second time domain resource allocation tables to the UE.   
     
     
         4 . The method of  claim 1 , further comprising:
 transmitting, by the network node, HARQ ACK/NACK bit-mapping information to the UE.   
     
     
         5 . The method of  claim 4 , wherein the bit-mapping information maps entries in the first time domain resource allocation table to entries in the second time domain resource allocation table. 
     
     
         6 . The method of  claim 1 , further comprising:
 transmitting, by the network node, HARQ ACK/NACK bit-bundling information to the UE.   
     
     
         7 . The method of  claim 6 , wherein the bit-bundling information indicates to the UE to use a bit-bundling operation when at least two entries in the first time domain resource allocation table are mapped to one entry in the second time domain resource allocation table. 
     
     
         8 . The method of  claim 7 , wherein the bit-bundling information indicates to the UE to use the bit-bundling operation based on a logical AND operation for ACK/NACKs associated with the at least two entries in the first time domain resource allocation table which have associated downlink control information (DCI) or expected semi persistent scheduling (SPS) physical downlink shared channel (PDSCH) allocations. 
     
     
         9 . The method of  claim 1 , wherein the network node is a gNB. 
     
     
         10 . A method of communications, comprising:
 receiving, by a user equipment (UE), configuration information from a network node, the configuration information indicating to the UE to use a second time domain resource allocation table for generating one or more hybrid automatic repeat request (HARQ) acknowledgements (ACKs) and/or negative ACKs (NACKs);   receiving, by the UE, downlink data from the network node; and   transmitting, by the UE, the one or more ACKs/NACKs to the network node in response to the receiving of the downlink data, the one or more ACKs/NACKs configured based at least on the second time resource allocation table.   
     
     
         11 . The method of  claim 10 , further receiving:
 a first time domain resource allocation table, wherein first time domain resource allocation table is different from the second time domain resource allocation table, the first time domain resource allocation table used for indicating time domain resources allocated to a physical downlink shared channel for transmitting the downlink data to the UE and the second time domain resource allocation table used for generating the one or more HARQ ACKs/NACKs by the UE.   
     
     
         12 . The method of  claim 10 , further comprising:
 receiving, by the UE, HARQ ACK/NACK bit-mapping information from the network node.   
     
     
         13 . The method of  claim 12 , wherein the bit-mapping information maps entries in the first time domain resource allocation table to entries in the second time domain resource allocation table. 
     
     
         14 . The method of  claim 10 , wherein entries in the first time domain resource allocation table are mapped into non-overlapping entries in the second time domain resource allocation table, wherein the mapping is determined based at least on a starting or ending allocation symbol. 
     
     
         15 . The method of  claim 10 , wherein entries in the first time domain resource allocation table are mapped into overlapping entries in the second time domain resource allocation table, wherein the mapping is determined based at least on a starting or ending allocation symbol. 
     
     
         16 . The method of  claim 10 , further comprising:
 receiving, by the UE, HARQ ACK/NACK bit-bundling information from the network node.   
     
     
         17 . The method of  claim 16 , wherein the one or more ACK/NACKs are transmitted to the network node by performing a bit-bundling operation based at least on the bit-bundling information when at least two entries in the first time domain resource allocation table are mapped to one entry in the second time domain resource allocation table. 
     
     
         18 . The method of  claim 17 , wherein the bit-bundling operation is based on a logical AND operation for ACK/NACKs associated with the at least two entries in the first time domain resource allocation table which have associated downlink control information (DCI). 
     
     
         19 . The method of  claim 17 , wherein the bit-bundling operation is based on a logical OR operation for ACK/NACKs associated with all entries of a plurality of entries in the first time resource allocation table mapped to one entry in the second resource allocation table. 
     
     
         20 . The method of  claim 10 , wherein the network node is a gNB.