Route Selection in Wireless Systems Using Physical Layer Parameter Optimization
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Solution Overview
Problem
Existing wireless communication systems in industrial settings, such as grid automation and manufacturing, face challenges in optimizing route selection for high reliability and low latency, particularly in machine-to-machine communication where short messages are transferred between base stations.
Innovation Solution
A method for route selection in an OFDM system that evaluates and selects routes based on parameters like cyclic prefix length and other physical layer settings to minimize latency and packet error rate, ensuring communication quality by considering signal-to-interference and noise ratios, and processing times through network controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a route with fewer hops is selected to reduce latency, then transmission speed is improved, but communication reliability may deteriorate due to fewer diversity paths
Solution Approach 1:
The patent changes physical layer parameters (cyclic prefix length, modulation scheme, code rate, transmit power) for different links in the route to optimize the balance between latency and reliability. By adjusting these parameters, the system can achieve reliable communication over multi-hop routes without excessive latency penalty.
Solution Approach 2:
The system dynamically selects routes and adjusts physical layer parameters based on real-time channel conditions, packet error rates, and latency requirements. This dynamic adaptation allows the system to switch between direct and relayed routes, and adjust transmission parameters to maintain optimal performance.
2Reliability
If physical layer parameters are optimized for high reliability, then communication quality is improved, but system complexity increases due to multiple parameter evaluations
Solution Approach 1:
The patent segments the route selection process into distinct steps: evaluating candidate routes, selecting initial physical layer parameters, evaluating packet error rates, and adjusting parameters iteratively. This segmentation makes the complex optimization process more manageable and systematic.
Solution Approach 2:
The system uses feedback from packet error rate measurements to iteratively adjust physical layer parameters. By monitoring actual communication quality and adjusting parameters based on this feedback, the system achieves high reliability without requiring exhaustive pre-computation of all possible parameter combinations.
3Reliability
If cyclic prefix length is increased to improve signal quality, then communication reliability is improved, but transmission latency increases
Solution Approach 1:
The patent systematically evaluates different cyclic prefix lengths as part of the physical layer parameter optimization process. By comparing the impact of different CP lengths on both signal quality and latency, the system selects the optimal CP length that achieves the required reliability with minimal latency penalty.
Data Source
AI summary
A method (100) of route selection in a wireless communication system and a control system (40) is provided. The method includes selecting a route between a first node (1) and a second node (2) and comprises: —evaluating (110) a plurality of possible routes (R1, R2, R3, R4), at least one route (R2, R3, R4) including a third node (3, 4) between the first and the second node; and —selecting (160) the route that has the lowest latency among the possible routes. Especially the method (100) includes: —selecting (120) parameter settings for each link of the possible routes, said selecting (120) comprising; —selecting (130) the length of the cyclic prefix, —evaluating (140) combinations of the selected cyclic prefix and different settings of the at least one further parameter of the physical layer; —selecting (150) the parameter settings that has lowest estimated latency and fulfils at least one communication quality criterion.