HARQ-ACK Feedback Transmission Across Bandwidth Parts
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency for hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback transmissions due to limitations in utilizing HARQ-ACK resources across different bandwidth parts (BWPs) during time division duplexing (TDD) patterns, leading to increased latency.
Innovation Solution
The system allows user equipment (UE) to transmit HARQ-ACK feedback on a physical uplink control channel (PUCCH) resource of a BWP associated with a different TDD pattern than the downlink transmission, enabling flexible BWP configurations to reduce latency by utilizing available PUCCH resources across multiple BWPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If HARQ-ACK feedback is transmitted only on PUCCH resources of the same BWP as the downlink transmission, then resource allocation is simple and manageable, but latency increases due to unavailable uplink resources in certain TDD patterns
Solution Approach 1:
The patent enables PUCCH resources from multiple different BWPs to be used for HARQ-ACK feedback transmission. Instead of restricting feedback to the same BWP as the downlink transmission, the system allows dynamic selection of PUCCH resources from any configured BWP, making the resource allocation system multi-functional and adaptable to different TDD patterns and latency requirements
Solution Approach 2:
The patent introduces dynamic BWP switching capability for PUCCH resource selection. The UE can dynamically switch between different BWPs to find available uplink resources for HARQ-ACK feedback, transforming a static resource allocation approach into a dynamic one that adapts to real-time TDD pattern constraints and latency requirements
2Productivity
If multiple BWPs with different TDD patterns are configured, then spectral efficiency and data rate improve through flexible resource utilization, but the complexity of managing HARQ-ACK resources across BWPs increases
Solution Approach 1:
The patent segments the PUCCH resource management by BWP, allowing each BWP to be independently configured and managed with its own TDD pattern. This segmentation enables flexible resource utilization across BWPs while maintaining manageable complexity through modular BWP-specific configurations
Solution Approach 2:
The patent changes the parameter of PUCCH resource selection from fixed (same BWP only) to variable (any configured BWP). By introducing BWP-specific TDD patterns and allowing dynamic selection based on availability, the system transforms resource allocation from a static to a flexible parameter-driven approach that optimizes spectral efficiency
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 base station, a downlink transmission in a downlink resource of a first bandwidth part (BWP) associated with a first time division duplexing (TDD) pattern. The UE may transmit, to the base station based at least in part on the downlink transmission, hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback on a physical uplink control channel (PUCCH) resource of the first BWP or of a second BWP associated with a second TDD pattern. Numerous other aspects are described.