HARQ-ACK Feedback Management for Multi-Cell TDD Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face limitations in communication flexibility and efficiency, particularly in managing uplink-downlink configurations and feedback information across multiple cells with different settings, which hinders the effective use of advanced features like carrier aggregation and HARQ-ACK reporting.
Innovation Solution
The systems and methods described involve determining and managing uplink-downlink configurations and feedback factors for multiple cells, including the use of Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) information on the Physical Uplink Shared Channel (PUSCH), with specific schemes for selecting feedback factors like WDAIUL, to enable efficient communication across cells with different configurations, especially in the context of Time-Division Duplexing (TDD) and carrier aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single communication structure is used for wireless communication devices, then the system structure is simple, but communication flexibility and efficiency are limited
Solution Approach 1:
The patent segments the communication structure by introducing separate downlink and uplink configuration parameters that can be independently determined for each cell. This allows different communication configurations to be applied to different cells while maintaining a unified overall framework, thereby improving communication flexibility without excessive complexity.
Solution Approach 2:
The patent implements dynamic configuration by allowing the network device to determine downlink and uplink parameters dynamically for each cell based on actual communication needs. The configurations can be adjusted per cell and per time period, enabling the system to adapt to changing communication requirements while maintaining structured management.
2Productivity
If multiple cells with different configurations are used, then communication efficiency improves, but managing feedback information becomes complex
Solution Approach 1:
The patent applies local quality by determining downlink and uplink parameters independently for each cell based on its specific configuration and communication status. Each cell can have customized feedback timing and resource allocation, allowing efficient local optimization without requiring complex global coordination for feedback management.
Solution Approach 2:
The patent utilizes parameter changes by introducing cell-specific downlink configuration parameters and uplink configuration parameters that can be independently adjusted. These parameter changes enable the system to optimize feedback information management for each cell according to its characteristics, improving overall communication efficiency while maintaining manageable complexity through structured parameter control.
3Productivity
If carrier aggregation with different TDD configurations is implemented, then network performance improves, but HARQ-ACK reporting becomes complicated
Solution Approach 1:
The patent applies preliminary action by having the network device determine and configure downlink and uplink parameters for each cell in advance based on their respective TDD configurations. The HARQ-ACK feedback timing and resource allocation are pre-established through these configuration parameters, simplifying the actual feedback reporting process even when multiple cells with different TDD configurations are aggregated.
Solution Approach 2:
The patent implements universality by creating a unified parameter determination mechanism that works across multiple cells with different TDD configurations. The same framework for determining downlink configuration parameters and uplink configuration parameters can be applied universally to any cell in the carrier aggregation, enabling consistent HARQ-ACK reporting management despite configuration differences.
Data Source
AI summary
A method for sending feedback information by a User Equipment (UE) is described. The method includes determining uplink-downlink (UL-DL) configurations for multiple cells. At least two of the multiple cells have different uplink-downlink (UL-DL) configurations. The method also includes determining first feedback factors for the multiple cells based on a second feedback factor. The method further includes sending Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK) information on a Physical Uplink Shared Channel (PUSCH) based on the first feedback factors for the multiple cells.