Adaptive Channel Selection in Wireless Networks
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Solution Overview
Problem
In heterogeneous wireless networks, existing channel selection methods fail to effectively manage interference among devices with different transmit powers and antenna types, leading to increased average interference, especially when high power devices or directional antennas are introduced.
Innovation Solution
A method for adaptive channel selection that involves determining a combined interference measure by weighing self-interference and altruistic interference, allowing nodes to autonomously select channels that minimize overall interference without relying on external systems, using echo signals to estimate interference from other nodes and adjusting channel bandwidth accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional WiFi adaptive channel selection algorithms are used in heterogeneous networks with high power devices, then channel selection is simplified, but average interference increases significantly
Solution Approach 1:
The patent modifies the channel selection parameters by introducing a combined interference measure that incorporates both self-interference (UiS) and altruistic interference (UiA) components. This parameter change enables the algorithm to account for the impact on other nodes, not just the selecting node, thereby reducing overall interference in heterogeneous networks while maintaining autonomous operation.
Solution Approach 2:
The patent implements a feedback mechanism where nodes transmit echo signals to receive feedback about the interference their presence would cause to other nodes. This feedback loop allows nodes to adjust their channel selection based on the measured altruistic interference, creating a distributed control system that minimizes overall interference without centralized coordination.
2Productivity
If high power devices or directional antennas are introduced to the network, then network capacity increases, but interference management becomes more difficult
Solution Approach 1:
The patent enables each node to autonomously manage interference by performing self-measurement of both self-interference and altruistic interference. Each node independently calculates the combined interference measure and makes its own channel selection decision, eliminating the need for complex centralized interference management while accommodating high power devices and directional antennas.
Solution Approach 2:
The patent segments the interference management task by dividing the interference measure into two independent components: self-interference (UiS) which affects the selecting node, and altruistic interference (UiA) which affects other nodes. This segmentation allows each component to be measured and managed independently, simplifying the overall interference management complexity even in heterogeneous networks.
3Reliability
If geolocation databases coordinate TVWS sharing based on location information, then channel allocation is centralized, but communication overhead and scalability issues increase
Solution Approach 1:
The patent extracts the coordination function from centralized geolocation databases and implements it at the individual node level through autonomous measurement and calculation of interference metrics. Each node independently determines the combined interference measure without requiring continuous communication with external databases, thereby eliminating the scalability issues associated with centralized coordination while maintaining reliable channel allocation.
Data Source
AI summary
An adaptive channel selection method is disclosed, performed by an autonomous communications node for selecting one of a plurality of possible channels in an unlicensed spectrum band. The method comprises: (a) for each channel: (i) determining a first interference measure UiS for the channel based on received energy from one or more other nodes j using said channel; (ii) causing the or each other node j using said channel to transmit an echo signal and receiving the echo signal(s) at the first communications node; (iii) determining from the or each echo signal a second interference measure UiA; (iv) determining a third interference measure Ui based on a combination of the first and second interference measures; and (b) selecting a channel whose third interference measure meets a predetermined condition.