Physical Layer Link Adaptation for Asymmetric Traffic
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Solution Overview
Problem
Current mobile data transmission systems face challenges in optimizing data throughput due to limitations in physical layer link adaptation, particularly in scenarios with asymmetric traffic loads between data transfer and feedback directions, leading to suboptimal error rate probabilities and inefficient use of HARQ retransmissions.
Innovation Solution
A method and device that adjust physical layer link adaptation parameters separately for data transfer and feedback directions by modifying modulation and coding schemes based on buffer fill levels and quality of service, using infinite impulse response filtering and hysteresis thresholds to achieve distinct error rate probabilities, maximizing capacity in the data transfer direction and reliability in the feedback direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single physical layer link adaptation parameter is used for both data transfer and feedback directions, then device complexity is reduced, but system performance deteriorates due to inability to optimize for asymmetric traffic patterns
Solution Approach 1:
The patent segments the link adaptation parameter configuration into separate settings for data transfer direction and feedback direction. This allows independent optimization of parameters (such as modulation and coding schemes) for each traffic type, enabling the system to handle asymmetric traffic patterns effectively while maintaining manageable complexity through structured separation.
Solution Approach 2:
The patent applies local quality by using direction-specific link adaptation parameters tailored to the characteristics of each traffic direction. Data transfer direction uses parameters optimized for high throughput, while feedback direction uses parameters optimized for reliability, ensuring that each part of the system operates with locally optimal parameters for its specific function.
2Productivity
If link adaptation parameters are optimized for maximum capacity in data transfer direction, then productivity increases, but reliability deteriorates in feedback direction due to higher error rate probabilities
Solution Approach 1:
The patent segments the optimization goals by direction, allowing data transfer to be optimized for maximum capacity with higher tolerable error rates, while feedback transmission is separately optimized for reliability with lower error rates. This segmentation resolves the contradiction by allowing each direction to have its own performance priorities.
Solution Approach 2:
The patent applies different quality levels to different directions: data transfer direction uses parameters that maximize throughput capacity, while feedback direction uses parameters that ensure high reliability. This local quality approach allows the system to achieve both high productivity in data transfer and high reliability in feedback simultaneously.
3Manufacturing precision
If physical layer link adaptation is designed for large packets with full buffer, then manufacturing precision of transmission efficiency is improved, but adaptability deteriorates for small packet scenarios
Solution Approach 1:
The patent introduces dynamic adaptation by making link parameters dependent on both traffic direction and buffer status. The system can dynamically switch between parameter sets optimized for large packets and those suitable for small packets, enabling it to adapt to varying traffic conditions while maintaining high transmission efficiency in each scenario.
Solution Approach 2:
The patent changes parameters based on buffer status and traffic direction. When buffer is full and traffic is data transfer, parameters are set for maximum efficiency with large packets. When buffer is empty or traffic is feedback, parameters are adjusted for small packet scenarios. This parameter adaptation resolves the contradiction between optimization for large packets and adaptability to small packets.
Data Source
AI summary
In accordance with an example embodiment of the present invention, there is provided a method, including receiving data for transmission over a physical link, acquiring information about the data transmission, setting physical layer link adaptation parameters for the transmission based on the acquired information, wherein the setting includes adjusting the physical layer link adaptation parameters separately for transmission in an application data transfer direction and an application feedback direction. Also, the present invention provides a correspondingly adapted device and computer program product.