Cellular Downlink Channel Adaptation for Non-Stationary Interference
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Solution Overview
Problem
Conventional 4G and 5G communication systems struggle to maintain consistent block error rate (BLER) in the presence of non-stationary interference, such as bursty Bluetooth transmissions, leading to inconsistent modulation and coding scheme (MCS) selection and reduced throughput.
Innovation Solution
Adapt the target BLER dynamically based on the variance of the signal-to-interference and noise ratio (SINR) offset to mitigate non-stationary interference, using a state machine to transition between different target BLER values based on pre-determined thresholds, thereby enhancing spectral efficiency and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional link adaptation methods are used, then the system operates with fixed target BLER, but the block error rate becomes inconsistent in the presence of non-stationary interference
Solution Approach 1:
The patent implements dynamic target BLER adaptation by continuously monitoring SINR offset variance and adjusting the target BLER accordingly. The system transitions between different target BLER values (e.g., 10% or 20%) based on whether the SINR offset variance exceeds a threshold, enabling the link adaptation to dynamically respond to changing interference conditions rather than using a fixed target BLER
Solution Approach 2:
The system employs feedback mechanisms by measuring the SINR offset between predicted and actual SINR values, calculating the variance of these offsets, and using this variance information to adjust the target BLER. This closed-loop feedback enables the system to detect non-stationary interference conditions and adapt the target BLER to maintain consistent actual BLER performance
2Productivity
If the target BLER is fixed, then the system is simple to operate, but the throughput decreases in the presence of non-stationary interference
Solution Approach 1:
The system dynamically adjusts the target BLER based on measured SINR offset variance, allowing the link adaptation to optimize throughput under varying interference conditions. When non-stationary interference is detected (high variance), the system increases the target BLER to maintain acceptable performance, thereby improving throughput compared to a fixed low target BLER approach
Solution Approach 2:
The patent changes the target BLER parameter from a fixed value to a dynamically adjustable parameter based on SINR offset variance measurements. This parameter change enables the system to adapt to non-stationary interference conditions, improving throughput by selecting appropriate target BLER values (e.g., switching between 10% and 20%) rather than being constrained to a single fixed value
3Reliability
If the system adapts to non-stationary interference, then the BLER consistency improves, but the computational complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for adaptation by focusing specifically on the variance of SINR offsets rather than analyzing the complete channel state. This extraction approach maintains BLER consistency by monitoring a key metric (variance) while avoiding the computational complexity of full channel analysis, achieving a balance between reliability and complexity
Data Source
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AI summary
Example methods and systems for adapting fourth generation (4G) and/or fifth generation (5G) cellular downlink channels in the presence of non-stationary interference are disclosed. An example method, implemented by one or more processors of a cellular base station, includes: receiving, from a user equipment (UE) radio, channel state information (CSI) for a cellular downlink channel between the cellular base station and the UE; determining a signal to interference and noise ratio (SINR) offset based upon the CSI, and a target block error rate (BLER); determining a variance of the SINR offset that represents one or more characteristics of the non-stationary interference; and determining the target BLER based upon the variance of the SINR offset such that the cellular downlink channel adapts to the presence of the non-stationary interference.