HARQ Codebook Grouping for Multi-Sub-Band Virtual Carriers
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Solution Overview
Problem
Existing wireless communication systems face challenges in providing adequate Hybrid Automatic Repeat Request (HARQ) feedback for transport blocks associated with virtual component carriers having multiple sub-bands, particularly in flexible spectrum integration scenarios, as traditional HARQ codebooks lack sufficient payload structures for mapping ACK/NACK feedback.
Innovation Solution
A codebook configuration is provided for HARQ feedback that allows UEs to transmit feedback for transport blocks associated with virtual component carriers having multiple sub-bands, enabling effective communication in flexible spectrum integration scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional HARQ codebooks are used for feedback, then the system maintains simplicity in feedback structure, but the codebook lacks sufficient payload structures for mapping ACK/NACK feedback in virtual component carrier scenarios with multiple sub-bands
Solution Approach 1:
The feedback payload is segmented into multiple codebook groups, where each group corresponds to a specific sub-band or set of sub-bands. This segmentation allows the system to handle feedback for virtual component carriers with multiple sub-bands by dividing the overall feedback structure into manageable segments, each with appropriate payload structures for ACK/NACK mapping.
Solution Approach 2:
The patent introduces a new dimension to the codebook structure by organizing codebooks in a hierarchical manner with codebook groups and individual codebooks within each group. This multi-dimensional organization enables the system to accommodate virtual component carriers with multiple sub-bands while maintaining a structured approach to feedback mapping.
2Reliability
If the HARQ codebook is designed to support virtual component carriers with multiple sub-bands, then feedback coverage is improved, but the codebook structure becomes more complex
Solution Approach 1:
The codebook is segmented into multiple codebook groups, with each group dedicated to specific sub-bands. This segmentation ensures that feedback for each sub-band can be reliably mapped to appropriate payload structures while keeping the overall system manageable through organized grouping.
Solution Approach 2:
The codebook structure is designed with universal principles that allow the same framework to handle both traditional single-carrier scenarios and advanced virtual component carrier scenarios with multiple sub-bands. The hierarchical codebook group structure provides a universal solution that adapts to different carrier configurations without requiring entirely separate feedback mechanisms.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a hybrid automatic repeat request (HARQ) configuration for transmitting HARQ feedback for one or more transport blocks associated with a virtual component carrier having multiple sub-bands. The UE may transmit the HARQ feedback for the one or more transport blocks in accordance with the HARQ configuration. Numerous other aspects are described.