HARQ Codebook Reception for Multicarrier Systems
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) acknowledgments, particularly in dynamic and diverse radio environments, which affects data transmission reliability and network performance.
Innovation Solution
The implementation of a hybrid automatic repeat request (HARQ) codebook determination mechanism within the multicarrier communication system, utilizing advanced modulation and transmission techniques such as OFDM/CDMA and QAM, to optimize HARQ processes across multiple carriers and improve data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ acknowledgment management is implemented in current multicarrier communication systems, then data transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the HARQ acknowledgment process into distinct codebook types (Type-1 for semi-static, Type-2 for dynamic) with specific determination methods for each. This segmentation allows the system to choose appropriate complexity levels based on channel conditions and service requirements, managing overall system complexity while maintaining reliability.
Solution Approach 2:
The patent implements dynamic HARQ codebook determination where the UE adapts between semi-static and dynamic codebook approaches based on radio conditions. The dynamic codebook type allows real-time adjustment of acknowledgment feedback based on channel quality, enabling reliability optimization without permanently increasing system complexity.
2Reliability
If advanced modulation techniques such as OFDM/CDMA and QAM are utilized, then data transmission reliability is enhanced, but computational requirements increase
Solution Approach 1:
The patent changes modulation parameters dynamically by selecting different HARQ codebook types and sizes based on channel conditions. The UE adjusts the codebook size and structure parameters according to radio quality, allowing advanced modulation techniques to be applied selectively when needed, thereby enhancing reliability while managing computational requirements through parameter adaptation.
3Productivity
If HARQ codebook determination is dynamically adapted to radio conditions, then network performance is improved, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-determining HARQ codebook types and structures based on semi-static configurations and channel conditions. The UE prepares the appropriate codebook format in advance before actual HARQ feedback transmission, reducing last-minute processing overhead while maintaining dynamic adaptation benefits for network performance.
Data Source
AI summary
A base station transmits one or more messages comprising one or more configuration parameters indicating: a first subcarrier spacing for a first bandwidth part (BWP) of a scheduling cell, and a second subcarrier spacing for a second BWP of a scheduled cell different from the scheduling cell. The first subcarrier spacing is lower than the second subcarrier spacing. The base station transmits, in a control channel monitoring occasion in a time slot of the scheduling cell and via the scheduling cell, a plurality of downlink control information (DCIs) scheduling transport blocks (TBs) for the scheduled cell, wherein a number of the plurality of DCIs is based on the first subcarrier spacing and the second subcarrier spacing. The base station receives an acknowledgment codebook comprising acknowledgment information bits of the TBs. The acknowledgement information bits are ordered, in the acknowledgment codebook, based on starting times associated with the TBs.