Link Adaptation Process Segmentation for Wireless Traffic Reliability
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Solution Overview
Problem
Current link adaptation algorithms in wireless local area networks do not consider varying reliability requirements of transmitted packets, leading to packet loss during sampling new data rates without channel state/quality feedback.
Innovation Solution
A method where traffic flows are categorized based on reliability requirements, allowing for the selection of appropriate link adaptation processes to prioritize either packet reliability or throughput, with the link adaptation process for higher reliability traffic flows using well-tested modulation and coding schemes to minimize packet error rates and for lower reliability flows optimizing for highest throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single link adaptation process is used for all traffic flows, then device complexity is reduced, but reliability requirements of different traffic flows cannot be met
Solution Approach 1:
The patent segments the single link adaptation process into multiple distinct processes (first link adaptation process and second link adaptation process) that are selectively applied based on traffic flow category. This segmentation allows each process to be optimized for specific reliability requirements without requiring all processes to be simultaneously complex, thereby resolving the contradiction between meeting diverse reliability needs and maintaining device complexity at acceptable levels.
Solution Approach 2:
The patent applies local quality by assigning different link adaptation processes to different traffic flow categories based on their specific reliability requirements. The first link adaptation process is applied to traffic flows requiring higher reliability, while the second process is applied to traffic flows with lower reliability requirements. This localized application ensures that each traffic flow receives the appropriate level of adaptation complexity needed for its specific reliability needs.
2Productivity
If sampling transmission is used to test new data rates, then throughput is improved, but packet loss increases due to lack of channel state feedback
Solution Approach 1:
The patent changes the parameters of the link adaptation process based on traffic flow category. For the first link adaptation process (applied to high reliability traffic), sampling transmission is disabled and well-tested modulation and coding schemes are used instead, thereby maintaining low packet error rates. For the second link adaptation process (applied to lower reliability traffic), sampling transmission can be used to test new data rates and improve throughput. This parameter change approach allows the system to optimize for either reliability or throughput depending on the specific traffic flow requirements.
Data Source
AI summary
Embodiments described herein relate to methods and apparatus for performing link adaptation processes in a network. A method in a transmitting node in a wireless local area network comprises obtaining a first traffic flow for transmitting to a receiving node, wherein the first traffic flow is associated with a first category based on a reliability requirement associated with the first traffic flow; selecting a first link adaptation process from a plurality of link adaptation processes based on the first category; and transmitting the first traffic flow to the receiving node based on the first link adaptation process.