Multiplexed HARQ Feedback Transmission in Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting multiplexed HARQ feedbacks in carrier aggregation systems, particularly in managing HARQ processes across multiple cells and configuring PUCCH resources to optimize data transmission and power consumption.
Innovation Solution
The method involves grouping cells into PUCCH groups, configuring PUCCH resources, and generating multiplexed HARQ feedbacks to be transmitted on specific cells, with cells without PUCCH resources associated with cells that have PUCCH resources, allowing for efficient ACK/NACK feedback management and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cells are configured with PUCCH resources for HARQ feedback transmission, then HARQ feedback reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides multiple cells into distinct PUCCH groups, where each group is associated with a specific PUCCH resource. This segmentation allows HARQ feedback for different cell groups to be transmitted separately, improving reliability by ensuring that feedback for critical cells can be sent through dedicated resources while reducing overall system complexity through organized resource allocation.
Solution Approach 2:
The patent establishes PUCCH resource configurations and cell group associations in advance through higher-layer signaling before data transmission begins. This preliminary configuration enables the system to handle HARQ feedback efficiently during operation without requiring complex real-time decision-making, thereby reducing operational complexity while maintaining reliability.
2Device complexity
If all HARQ feedbacks are transmitted on a single cell, then device complexity is reduced, but transmission reliability and efficiency deteriorate
Solution Approach 1:
Instead of transmitting all HARQ feedbacks on a single cell, the patent segments feedback transmission across multiple cells organized in PUCCH groups. Each group's feedback is transmitted on its associated cell, which distributes the transmission load and improves reliability by avoiding single-point failures while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent assigns different PUCCH resources to different cell groups based on their specific requirements. This allows critical cells to have dedicated reliable transmission paths while less critical cells share resources, optimizing reliability for each local context without requiring uniform high-complexity configurations across all cells.
3Productivity
If PUCCH resources are allocated to all cells, then HARQ feedback efficiency is improved, but power consumption increases
Solution Approach 1:
The patent enables a single PUCCH resource to serve multiple cells within a PUCCH group, allowing the same uplink resource to carry multiplexed HARQ feedback for several cells. This multi-functionality improves feedback efficiency by consolidating transmissions while reducing power consumption by avoiding the need for separate dedicated resources for each cell.
Solution Approach 2:
The patent combines HARQ feedback from multiple cells into a single multiplexed transmission on the associated PUCCH resource. By merging feedback messages that would otherwise require separate transmissions, the system achieves efficient feedback delivery while significantly reducing the number of active transmission channels and associated power consumption.
Data Source
AI summary
A method for a wireless device operating in a wireless communication system includes receiving configuration information for configuring a non-Physical Uplink Control Channel (PUCCH) cell; and transmitting a Hybrid Automatic Repeat request (HARQ) feedback of the non-PUCCH cell on a special cell (SpCell) or a PUCCH cell other than SpCell, according to indication information. Further, when the indication information is not received with the configuration information, the HARQ feedback is transmitted on the SpCell, and when the indication information is received with the configuration information, the HARQ feedback is transmitted on the PUCCH cell.