Dynamic Channel Bandwidth Selection for Multi-Bandwidth Wireless Nodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless networks, particularly ad hoc networks, face challenges in dynamically adjusting channel bandwidths based on link quality, leading to suboptimal performance due to varying delay spread conditions, which can result in either inadequate or excessive bandwidth usage.
Innovation Solution
Implementing multi-bandwidth nodes that can dynamically select between a default and alternate channel bandwidths, such as 10 MHz, 20 MHz, or 5 MHz, by using Request-to-Send (RTS) and Clear-to-Send (CTS) messages to determine the optimal bandwidth for data transmission, ensuring MAC integrity and compliance with air interface standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed channel bandwidth is used for all transmissions, then device complexity is reduced and ease of operation is improved, but network performance deteriorates under varying delay spread conditions
Solution Approach 1:
The patent implements dynamic bandwidth selection where nodes can switch between different channel bandwidths (e.g., 10 MHz, 20 MHz, 5 MHz) based on real-time delay spread conditions. The system dynamically adjusts the channel bandwidth parameter rather than using a fixed value, allowing optimization of network performance while maintaining operational simplicity through automated selection.
2Productivity
If higher channel bandwidths are used to increase data transmission capacity, then productivity is improved, but reliability deteriorates under high delay spread conditions
Solution Approach 1:
The patent changes the channel bandwidth parameter adaptively based on delay spread measurements. When delay spread is low, higher bandwidths (e.g., 20 MHz) are selected to maximize data transmission capacity. When delay spread increases, the system switches to lower bandwidths (e.g., 5 MHz or 10 MHz) to maintain communication reliability, thus optimizing the trade-off between productivity and reliability through parameter adjustment.
3Reliability
If lower channel bandwidths are used to maintain reliability, then reliability is improved, but productivity deteriorates due to reduced data transmission capacity
Solution Approach 1:
The system dynamically adjusts channel bandwidth based on real-time channel conditions. Instead of operating at a fixed low bandwidth, the system transitions to higher bandwidths when conditions permit, thereby maximizing data transmission capacity while maintaining reliability when needed. This dynamic approach resolves the contradiction by making bandwidth selection conditional on channel quality.
4Adaptability or versatility
If dynamic bandwidth selection is implemented, then adaptability is improved and network performance is optimized, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where nodes automatically measure delay spread conditions and select appropriate bandwidths without external control. The system performs self-diagnosis of channel conditions and self-adjustment of bandwidth parameters, reducing the need for complex centralized control while maintaining high adaptability to varying network conditions.
Solution Approach 2:
The system uses feedback from delay spread measurements to guide bandwidth selection decisions. Nodes continuously monitor channel conditions and use this feedback to adjust their transmission parameters, creating a closed-loop control system that achieves high adaptability through relatively simple local decision-making based on real-time channel quality information.
Data Source
AI summary
Techniques and technologies are provided for dynamically selecting one of a default channel bandwidth and an alternate channel bandwidth for transmitting information over a wireless communication link which couples a transmitter node to a receiver node. The transmitter node and the receiver node are designed to transmit and receive at the default channel bandwidth and at the alternate channel bandwidth.