DCI Field Repurposing for HARQ Codebook Retransmission Signaling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in signaling overhead due to dedicated fields for indicating HARQ codebook retransmissions, particularly in one-shot HARQ feedback scenarios, which can lead to excessive signaling and increased power consumption.
Innovation Solution
Repurposing existing fields in downlink control information (DCI) to convey offset values for HARQ codebook retransmissions, such as using the modulation and coding scheme (MCS) field, rather than relying on dedicated offset indicator fields, allowing for more efficient signaling by interpreting other fields to determine the offset value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated offset indicator fields are used in DCI to indicate HARQ codebook retransmission offsets, then the reliability of HARQ retransmission signaling is improved, but the signaling overhead increases
Solution Approach 1:
The patent applies multi-functionality by enabling existing DCI fields (such as MCS, NDI, or RV fields) to serve dual purposes: their traditional functions and indicating HARQ codebook retransmission offsets. For example, the MCS field can indicate both modulation and coding scheme information and simultaneously convey the slot offset value for HARQ retransmission, thereby eliminating the need for dedicated offset indicator fields and reducing signaling overhead while maintaining signaling reliability
2Measurement precision
If dedicated offset indicator fields are used in DCI, then the precision of offset indication is improved, but the device complexity increases
Solution Approach 1:
The patent reuses existing DCI fields to convey offset information, avoiding the need for additional dedicated fields. This approach maintains offset indication precision by ensuring sufficient bit width in the repurposed fields while simplifying the overall DCI structure by eliminating redundant dedicated offset indicator fields, thereby reducing device complexity
3Productivity
If one-shot HARQ codebook retransmission is implemented, then the productivity of HARQ feedback is improved, but the use of energy increases
Solution Approach 1:
The patent extracts and eliminates redundant signaling elements (dedicated offset indicator fields) from the DCI structure. By removing these unnecessary fields and repurposing existing fields, the signaling overhead is reduced, which directly translates to lower power consumption for both transmission and reception of control information while maintaining one-shot HARQ codebook retransmission functionality
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information (DCI) including a hybrid automatic repeat request (HARQ) acknowledgement (ACK) retransmission indicator field set to indicate one-shot HARQ codebook retransmission. The UE may transmit, based at least in part on receiving the DCI, a HARQ codebook retransmission for a slot HARQ offset associated with another field of the DCI. Numerous other aspects are described.