Decoding Margin Based Transmission Configuration
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Solution Overview
Problem
In LTE networks, existing methods struggle to adjust transmission properties such as Modulation and Coding Scheme (MCS) to resource-efficient levels without introducing block errors, leading to conservative MCS selection and reduced system throughput, especially in scenarios requiring ultra-reliable communication and low latency.
Innovation Solution
A method in a radio network node that configures transmission properties based on the decoding margin of successfully transmitted transport blocks, allowing for more aggressive MCS selection by adjusting robustness levels based on the decoding margin, thereby optimizing resource use without increasing block errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative MCS selection is used to avoid block errors, then transmission reliability is improved, but system throughput deteriorates
Solution Approach 1:
The patent implements dynamic MCS selection by introducing an outer loop link adaptation mechanism that continuously adjusts MCS based on actual decoding performance (ACK/NACK feedback). The system transitions from static conservative MCS to dynamic MCS that adapts to channel conditions and device-specific characteristics, allowing aggressive MCS when conditions permit while maintaining reliability through feedback-driven adjustments.
Solution Approach 2:
The patent employs feedback mechanisms where the receiving device sends ACK/NACK signals back to the transmitting device based on decoding success. This feedback loop enables the system to learn from actual transmission outcomes and adjust MCS accordingly, resolving the contradiction by using real performance data to optimize the trade-off between reliability and throughput.
2Productivity
If aggressive MCS selection is used to increase system throughput, then productivity is improved, but transmission reliability deteriorates due to increased block errors
Solution Approach 1:
The patent implements preliminary action through outer loop link adaptation that pre-adjusts MCS based on accumulated feedback from previous transmissions. Before attempting aggressive MCS, the system prepares by analyzing historical ACK/NACK patterns and device-specific CQI biases, allowing it to safely increase throughput while maintaining reliability through proactive adjustments.
Solution Approach 2:
The patent changes the MCS parameter dynamically based on feedback and device characteristics. By adjusting the MCS index (which directly controls modulation order and code rate), the system can shift between conservative and aggressive transmission modes, resolving the contradiction between throughput and reliability through controlled parameter variation.
3Reliability
If UE-specific CQI offset tuning is performed to achieve target BLER, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service through automated outer loop link adaptation that performs CQI offset tuning without manual intervention. The system automatically analyzes ACK/NACK feedback and adjusts UE-specific CQI offsets to achieve target BLER, reducing the complexity burden on individual devices while maintaining high reliability through collective system-level optimization.
Data Source
AI summary
The present disclosure relates to methods of configuring transmission properties in a radio network node. More particularly the disclosure pertains to configuring transmission properties based on a successful decoding of one or more transport blocks. The disclosure also relates to methods of configuring transmission properties in the uplink and in the downlink and to corresponding radio network node and computer program. According to some aspects, the disclosure proposes a method, performed in a radio network node that is communicating with a wireless device, of configuring transmission properties. The method comprises obtaining information indicative of a decoding margin of a successful decoding of a first transport block transmitted, using a set of transmission properties, between the radio network node and the wireless device and reconfiguring the transmission properties to be used for further transmissions between the radio network node and the wireless device, based on the obtained information indicative of a decoding margin.