Dynamic Link Adaptation Protocol for 5G Channel Quality Reporting
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Solution Overview
Problem
Current 5G NR protocols face challenges in providing high data rates and low packet delay for demanding applications like Virtual Reality (VR), Augmented Reality (AR), and Cloud gaming, due to limitations in channel quality reporting and retransmission protocols which result in increased packet delay and reliability issues.
Innovation Solution
The implementation of an enhanced dynamic link adaptation protocol that allows for multiple channel quality indicators to be reported based on various target error rates, enabling the wireless communication device and node to adjust modulation and coding schemes dynamically, thereby optimizing data transmission for better throughput and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single channel quality indicator is used for data transmission, then the protocol complexity is low, but the data transmission reliability and adaptability to different error rate requirements deteriorate
Solution Approach 1:
The patent segments the channel quality indicator into multiple indicators, each corresponding to a different target error rate (e.g., first CQI for first error rate, second CQI for second error rate). This segmentation allows the system to select appropriate quality indicators based on specific transmission requirements, improving reliability without requiring complete protocol redesign.
Solution Approach 2:
The patent implements dynamic selection of channel quality indicators based on target error rates. The system can dynamically choose which CQI to use for link adaptation depending on the desired error rate, making the protocol adaptable to different service requirements (e.g., eMBB vs. URLLC) while maintaining reasonable complexity through structured selection rules.
2Adaptability or versatility
If multiple channel quality indicators are reported for different target error rates, then the adaptability to different service requirements improves, but the signaling overhead and device complexity increase
Solution Approach 1:
The patent performs preliminary calculation of multiple channel quality indicators corresponding to different target error rates before actual data transmission. By pre-computing these indicators and storing them, the system reduces real-time computational complexity and signaling overhead during active transmission, as the indicators are already prepared and can be directly selected based on service requirements.
Solution Approach 2:
The patent creates a universal channel quality reporting mechanism where multiple CQIs serve multiple functions: they can be used for different service types (eMBB, URLLC, mMTC), different modulation schemes, and different reliability requirements. This multi-functionality reduces the need for separate reporting mechanisms for each service type, thereby controlling signaling overhead while maintaining high adaptability.
3Reliability
If retransmission is used to achieve high data rates, then the data rate reliability improves, but the packet delay increases
Solution Approach 1:
The patent performs preliminary link adaptation by selecting appropriate modulation and coding schemes based on pre-calculated channel quality indicators before data transmission begins. This preliminary action ensures that the first transmission is optimized for the desired error rate, reducing the likelihood of retransmission and thereby minimizing packet delay while maintaining data rate reliability.
Solution Approach 2:
The patent implements dynamic link adaptation where the system can dynamically adjust modulation and coding schemes based on real-time channel conditions and service requirements. This dynamic adjustment allows the system to achieve high data rates with appropriate reliability without relying heavily on retransmissions, thus reducing packet delay while maintaining data rate reliability.
Data Source
AI summary
Techniques of performing a dynamic link adaptation protocol and specifically providing a channel quality indicator, CQI, are disclosed.