HARQ Feedback Generation for Multi-TTI Scheduling Collisions
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Solution Overview
Problem
Current methods for scheduling multiple data transmissions using a single downlink control channel in 5G communication systems face challenges in generating hybrid automatic repeat request (HARQ) feedbacks, especially when data transmissions collide with configured uplink symbols, and in efficiently indicating time domain resources and grouping data transmissions.
Innovation Solution
The proposed solution involves generating HARQ feedbacks that include negative acknowledgments (NACKs) for collided data transmissions, grouping data transmissions based on configured groups, and using single values in DCI to indicate slot gaps and time domain resources, thereby reducing overhead and misalignment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If multiple data transmissions are scheduled by a single DCI to reduce control signaling overhead, then control signaling overhead is reduced, but HARQ feedback generation becomes complex especially when transmissions collide with uplink symbols
Solution Approach 1:
The patent segments HARQ feedback generation into two distinct codebooks: a first codebook for multiple data transmissions scheduled by a single DCI, and a second codebook for a single data transmission scheduled by another DCI. This segmentation allows each codebook to be optimized independently, reducing the overall complexity of handling multi-TTI scheduling feedback while maintaining reduced control signaling overhead.
Solution Approach 2:
The patent introduces an intermediary mechanism to handle collisions between scheduled transmissions and configured uplink symbols. When a collision is detected, the system automatically generates a NACK for the collided transmission in the first codebook, eliminating the need for complex collision resolution logic and simplifying the HARQ feedback generation process.
2Manufacturing precision
If detailed parameters are indicated for each data transmission in DCI to ensure precise resource allocation, then resource allocation precision is improved, but DCI overhead increases
Solution Approach 1:
The patent applies a universal time domain resource assignment mechanism where a single set of parameters in the DCI can indicate time domain resources for multiple data transmissions scheduled by that DCI. This multi-functional approach allows the same parameters to serve multiple transmissions, reducing DCI overhead while maintaining precise resource allocation through the unified parameter structure.
3Productivity
If data transmissions are grouped into multiple groups for HARQ feedback, then feedback organization efficiency is improved, but the complexity of grouping management increases
Solution Approach 1:
The patent segments data transmissions into multiple groups and assigns each group to a specific codebook (first codebook or second codebook). This segmentation simplifies grouping management by providing clear rules for assignment based on the DCI structure, while improving feedback organization efficiency through structured grouping that aligns with the codebook architecture.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication. A terminal device receives, from a network device, a plurality of first data transmissions scheduled by first DCI and a second data transmission scheduled by second DCI; and transmits, to the network device, a first HARQ feedback for the plurality of first data transmissions and a second HARQ feedback for the second data transmission, the first HARQ feedback comprising a NACK for a first data transmission in the plurality of first data transmissions that is collided with a configured uplink symbol. In this way, a rule is defined for generation of the HARQ feedback for the multiple data transmissions upon the above collision.