User Terminal HARQ Management for Multi-Point Transmission
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Solution Overview
Problem
In future radio communication systems, the configuration and design of the Hybrid Automatic Repeat Request (HARQ) entity and process in user terminals are not adequately addressed when multiple transmission points are used, leading to potential quality degradation of communication.
Innovation Solution
A user terminal is equipped with a receiving section to monitor downlink control information and a control section to detect the HARQ process number, managed by independent HARQ entities for each cell, allowing appropriate configuration and operation of HARQ processes even with multiple transmission points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ process is not performed appropriately when controlling scheduling of PDSCHs from multiple transmission points, then communication quality degradation occurs, but implementing proper HARQ management increases device complexity
Solution Approach 1:
The patent segments the HARQ management by introducing independent HARQ entities for each cell. Each HARQ entity independently manages HARQ processes for PDSCHs received from multiple transmission points within that cell. This segmentation allows proper HARQ control for multi-point transmission while maintaining organized, cell-based management structure, thereby ensuring communication quality without excessive system-wide complexity.
2Reliability
If independent HARQ entities are configured for each cell to manage HARQ processes from multiple transmission points, then communication quality is maintained, but the configuration and design complexity increases
Solution Approach 1:
The system divides HARQ management into cell-specific independent HARQ entities, where each entity handles HARQ processes for its cell's PDSCH transmissions from multiple transmission points. This segmentation maintains communication quality through proper per-cell HARQ control while localizing complexity to manageable cell-level units rather than system-wide complexity.
Solution Approach 2:
Each independent HARQ entity is designed to universally handle HARQ processes for multiple transmission points within its cell. The HARQ entity manages multiple HARQ processes that can accommodate PDSCHs from different transmission points, providing a multi-functional solution that maintains communication quality across diverse transmission scenarios without requiring separate specialized entities for each transmission point.
Data Source
AI summary
In order to appropriately configure a Hybrid Automatic Repeat Request (HARQ) process even when communication is performed using a plurality of transmission points, one aspect of a user terminal of the present disclosure includes: a receiving section that receives one or more pieces of downlink control information used for scheduling of downlink shared channels, which are transmitted from a plurality of transmission points, by monitoring a downlink control channel; and a control section that detects a HARQ process number, which is indicated by a HARQ process number field included in the downlink control information and which is managed by one or more independent HARQ entities for each cell.