HARQ Entity Cell Switching for Throughput
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Solution Overview
Problem
In wireless communication systems, the existing HARQ mechanism faces inefficiencies in data transmission and retransmission, particularly in scenarios where channel bandwidth and quality differ between initial and retransmission, leading to suboptimal data throughput and retransmission efficiency.
Innovation Solution
The proposed solution involves using different cells for initial and retransmitted data, where the correspondence between HARQ entities and cells is indicated through specific indication information, allowing for efficient switching of bandwidth parts (BWP) and retransmission in alternative cells to improve data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data retransmission is performed in the same cell after link interruption or beam mismatch, then system reliability is maintained through HARQ mechanism, but data throughput deteriorates due to poor channel conditions in the original cell
Solution Approach 1:
The patent introduces a second cell as an intermediary resource for retransmission when the first cell experiences link interruption or beam mismatch. The network device switches the correspondence between the first HARQ entity and the second cell, allowing retransmission to occur through this intermediary cell with better channel conditions, thereby resolving the contradiction between maintaining HARQ reliability and improving data throughput
Solution Approach 2:
The patent changes the cell parameter (specifically the cell correspondence of the HARQ entity) dynamically based on channel conditions. When the first cell's channel quality deteriorates, the system changes the cell parameter to switch retransmission to the second cell, thus adapting to varying channel conditions and improving throughput while maintaining reliability
2Device complexity
If the first cell recovers to normal for retransmission, then resource utilization is simplified, but data throughput deteriorates due to waiting time for cell recovery
Solution Approach 1:
The patent prepares a second cell as a standby resource in advance, establishing its correspondence with the first HARQ entity before it is needed. When link interruption or beam mismatch occurs in the first cell, the system can immediately switch to the pre-prepared second cell for retransmission without waiting for the first cell to recover, thus improving throughput while maintaining manageable resource complexity
3Productivity
If different cells are used for initial transmission and retransmission, then data throughput is improved by utilizing better channel conditions, but device complexity increases due to cell correspondence management
Solution Approach 1:
The patent makes the first HARQ entity universal by enabling it to correspond to multiple cells (both the first cell and the second cell). This multi-functionality allows the same HARQ entity to handle both initial transmission in the first cell and retransmission in the second cell, thereby improving throughput through cell switching while keeping the HARQ entity structure unchanged and managing complexity
Data Source
AI summary
A communication method and an apparatus are provided. An example method includes: receiving initially transmitted first data in a first cell based on a correspondence between the first cell and a first hybrid automatic repeat request (HARQ) entity; receiving first indication information, wherein the first indication information indicates a correspondence between a second cell and the first HARQ entity; and receiving retransmitted first data in the second cell based on the correspondence between the second cell and the first HARQ entity.