Dynamic Channel Bandwidth Allocation for Wireless Interference Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing shared spectrum, particularly in avoiding interference with legacy systems and optimizing bandwidth allocation to achieve higher throughput.
Innovation Solution
The implementation of a system that supports multiple frequency band operation, allowing for the selection of channel bandwidth and boundaries, and the use of Carrier Sense Multiple Access/Collision Avoidance methods to detect and mitigate interference by switching between primary and secondary channels, thereby optimizing bandwidth usage and maintaining compatibility with legacy systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher bandwidth channels are used to achieve higher throughput, then data transmission rate is improved, but interference with legacy systems increases
Solution Approach 1:
The patent segments the channel bandwidth into multiple component channels (e.g., 20 MHz channels forming a 40 MHz channel). This allows the system to transmit data at higher rates using wider bandwidth while monitoring and managing interference from legacy systems on individual component channels, thereby resolving the contradiction between achieving high throughput and avoiding interference with legacy systems.
Solution Approach 2:
The patent implements dynamic channel bandwidth selection and adjustment capabilities. The system can adaptively switch between different bandwidth modes (e.g., 20 MHz or 40 MHz) based on detected legacy system activity and interference conditions. This dynamic adjustment allows the system to optimize throughput when the spectrum is clear while reducing interference when legacy systems are present.
2Adaptability or versatility
If multiple frequency bands are used to improve spectrum utilization, then bandwidth efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements a universal channel access mechanism that operates across multiple frequency bands and bandwidth configurations using a single integrated system architecture. The Channel Access module and interference detection mechanisms are designed to handle both 20 MHz and 40 MHz channels, as well as legacy and non-legacy systems, through unified procedures. This multi-functionality approach enables efficient spectrum utilization across multiple bands while avoiding the need for separate complex systems for each frequency band.
3Reliability
If channel bandwidth selection is made to avoid interference with legacy systems, then compatibility is improved, but throughput is reduced
Solution Approach 1:
The patent implements dynamic bandwidth adjustment that allows the system to switch between 20 MHz and 40 MHz channel configurations based on real-time detection of legacy system activity. When legacy systems are detected on adjacent channels, the system dynamically reduces to 20 MHz mode to maintain compatibility. When no legacy systems are present, the system dynamically expands to 40 MHz mode to maximize throughput. This dynamic adaptation resolves the contradiction between maintaining backward compatibility and achieving high throughput.
Data Source
AI summary
Embodiments for bandwidth allocation methods, detecting interference with other systems, and/or redeploying in alternate bandwidth are described. Higher bandwidth channels may be deployed at channel boundaries, which are a subset of those for lower bandwidth channels, and may be restricted from overlapping. Interference may be detected on primary, secondary, or a combination of channels, and may be detected in response to energy measurements of the various channels. When interference is detected, a higher bandwidth Basic Service Set (BSS) may be relocated to an alternate channel, or may have its bandwidth reduced to avoid interference. Interference may be detected based on energy measured on the primary or secondary channel, and/or a difference between the two. An FFT may be used in energy measurement in either or both of the primary and secondary channels. Stations may also monitor messages from alternate systems to make channel allocation decisions. Various other aspects are also presented.