HARQ Feedback for Real-Time PDSCH MCS Adaptation
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Solution Overview
Problem
MCS adaptation in communication systems is inefficient due to slow outer loop link adaptation (OLLA) in scenarios like ultra-reliable low-latency communication (URLLC), leading to inadequate tracking of channel and interference changes, which affects transmission efficiency and latency.
Innovation Solution
A communication method where a network device sends downlink control information indicating a HARQ process associated with a PDSCH, receives indication information from the terminal device about its receiving status, and adjusts modulation and coding schemes (MCS) based on this feedback to dynamically respond to real-time channel and interference changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional outer loop link adaptation (OLLA) is used for MCS adjustment, then the system can maintain basic transmission functionality, but the adaptation speed is too slow to track real-time channel and interference changes, resulting in poor communication efficiency and excessive latency
Solution Approach 1:
The patent introduces a new feedback mechanism where the terminal device reports receiving status level information about PDSCH to the network device. This feedback loop enables the network device to quickly adjust MCS based on actual receiving conditions, significantly improving adaptation speed and accuracy compared to traditional OLLA.
Solution Approach 2:
The patent makes the MCS adaptation process dynamic by allowing real-time adjustments based on current channel conditions and receiving status levels. The system transitions from static or slow-adjusting OLLA to a dynamic feedback-driven adaptation mechanism that responds immediately to channel changes.
2Measurement precision
If traditional HARQ feedback mechanism is used, then the system can achieve basic error correction, but it cannot provide sufficient granularity for precise MCS adaptation and quick response to channel changes
Solution Approach 1:
The patent segments the receiving status into different levels (e.g., first receiving status level and second receiving status level) based on performance thresholds. This segmentation provides finer granularity for MCS adaptation compared to traditional binary ACK/NACK feedback, enabling more precise control.
Solution Approach 2:
The network device determines MCS adjustment actions in advance based on the receiving status levels reported by the terminal. By preparing and pre-calculating appropriate MCS values before actual transmission, the system reduces response time when channel conditions change.
Data Source
AI summary
A communication method, a communication device, a non-transitory computer-readable storage medium, and a computer program product. The communication method includes: a network device sends downlink control information to a terminal device, where the downlink control information indicates an identifier of a hybrid automatic repeat request (HARQ) process, and the identifier of the HARQ process is associated with a physical downlink shared channel (PDSCH); the network device sends the PDSCH to the terminal device; the network device receives indication information from the terminal device, where the indication information indicates a receiving status level of the terminal device for the PDSCH; and the network device determines, based on the indication information, a receiving status of the terminal device for the PDSCH. In this manner, the network device can quickly respond to real-time channel and interference changes.