Hybrid Open Closed Loop Link Adaption for MANETs
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Solution Overview
Problem
Highly dense and dynamic Mobile Ad Hoc Networks (MANETs) face challenges in bandwidth-limited link performance measurement and control, with undersampling in closed loop control loops and asymmetrical channel conditions affecting open loop methods, necessitating a hybrid approach that leverages both open and closed loop measurements for effective link quality estimation.
Innovation Solution
A method that selects link metric measurements from open or closed loop communications, estimates channel dynamics using variance and mean deviation, and adjusts transmission parameters using State Transition Tables to optimize link quality in terms of stability, capacity, and error rates, while managing the synergy between open and closed loop link adaptations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If closed loop link adaption is used, then link quality estimation accuracy is improved, but measurement update rate is reduced due to undersampling
Solution Approach 1:
The patent combines open loop and closed loop link adaption methods into a hybrid approach. The open loop method provides high-rate measurements for dynamic channel conditions, while the closed loop method provides accurate link quality estimation for static environments. By merging these two approaches, the system achieves both high update rates and accurate estimation without the limitations of either method alone.
2Productivity
If open loop link adaption is used, then measurement update rate is improved, but accuracy is reduced due to asymmetrical channel conditions
Solution Approach 1:
The hybrid approach merges open loop and closed loop methods to compensate for asymmetrical channel conditions. The open loop method provides high update rates, while the closed loop method provides accuracy by measuring actual received signal strength and error rates, allowing the system to adapt to asymmetrical conditions effectively.
Solution Approach 2:
The closed loop component provides feedback about actual link quality metrics (signal strength, error rates) to the transmission node, enabling continuous adaptation to asymmetrical channel conditions while maintaining high update rates through the open loop component.
3Measurement precision
If hybrid open/closed loop filtering is used, then link quality estimation is improved, but device complexity is increased
Solution Approach 1:
The patent segments the link adaption process into distinct open loop and closed loop components, each handling specific aspects of link quality estimation. The open loop handles dynamic measurements while the closed loop handles accuracy-critical estimations. This segmentation allows for modular implementation and reduces overall processing complexity by dividing the workload into manageable parts.
Data Source
AI summary
A method of selecting linked metric measurements from at least one of open loop and closed loop measurements is disclosed. The method includes sending by a first node a first radio communication and receiving by a second node the first radio communication over a communication link. The method also includes estimating by a second node dynamics of the communication channel using at least one of the variance and mean deviation of linked metric measurements. The link metric measurements are at least one of symbol error rate (SER), packet error rate (PER), frame error rate (FER), bit error rate (BER), signal to noise ration (SNR), and received signal strength (RSS). The method also includes the use of the above link metric measurements by the second node as Open Loop metrics and the sending back of these metrics to the first node for use a Closed Loop metrics by the first node. The method also includes categorizing the dynamics of the communications channel into one of at least two groups based on the estimate. Further still, the method comprises selecting, based on the chosen group, the use of at least one of closed loop link adaption and open loop link adaption of communication link parameters.