Dropped HARQ Codebook Recovery with DCI Codebook Identifiers
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) codebooks, particularly in scenarios where HARQ codebooks are dropped or canceled, leading to inefficiencies in data transmission and reception.
Innovation Solution
The implementation of a mechanism for a user equipment (UE) to receive and transmit dropped HARQ codebooks based on codebook identifiers (IDs) indicated in downlink control information (DCI), enabling more effective management and handling of canceled HARQ processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If HARQ codebooks are dropped or canceled in wireless communication systems, then resource allocation flexibility is improved, but data transmission reliability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the network node requests dropped HARQ codebooks from the UE through DCI messages. The UE responds by transmitting the requested codebooks, creating a closed-loop feedback system that ensures reliability while preserving the flexibility to drop codebooks when appropriate.
Solution Approach 2:
The network node proactively requests dropped HARQ codebooks before they are needed for retransmission. By anticipating the need for codebooks and requesting them in advance through DCI, the system ensures codebook availability while maintaining resource allocation flexibility.
2Reliability
If dropped HARQ codebooks are requested and transmitted, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the HARQ codebook management into distinct phases: normal operation where codebooks may be dropped, and recovery operation where specific codebooks are requested through DCI. This segmentation allows the system to minimize signaling overhead during normal operation while ensuring reliability when needed.
Solution Approach 2:
The system dynamically changes the state of HARQ codebooks from dropped to active based on network conditions and reliability requirements. By changing parameters such as codebook availability status and transmission timing, the system balances reliability improvements with signaling overhead management.
3Measurement precision
If codebook identifiers are included in DCI, then codebook management precision is improved, but DCI message complexity increases
Solution Approach 1:
The patent extracts only the essential codebook identifier information from the full HARQ codebook data and includes it in the DCI messages. This extraction approach provides sufficient precision for codebook management while minimizing the increase in DCI message complexity.
Solution Approach 2:
The system includes partial codebook information (identifiers) in DCI rather than complete codebook data. This partial action provides the necessary precision for codebook management while avoiding excessive DCI complexity that would result from including full codebook contents.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, downlink control information (DCI) that includes a request for a dropped hybrid automatic repeat request (HARQ) codebook, wherein the DCI indicates a codebook identifier (ID) associated with the dropped HARQ codebook. The UE may transmit, to the network node, the dropped HARQ codebook based at least in part on the codebook ID associated with the dropped HARQ codebook, as indicated in the DCI. Numerous other aspects are described.