Dynamic Channel Bandwidth Adjustment in WLAN Composite Channels
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Solution Overview
Problem
Conventional multi-channel allocation techniques in OFDM-based communication systems lack flexibility in modifying the bandwidth of composite communication channels, limiting data throughput and efficiency.
Innovation Solution
The method involves forming composite communication channels by duplicating control and data frames across multiple bandwidth portions, allowing dynamic adjustment of channel bandwidth based on channel status, and transmitting data frames during designated transmit opportunity periods (TXOP) using composite channels determined by idle channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multi-channel allocation techniques are used, then channel bandwidth is fixed, but data throughput and communication efficiency are limited
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by allowing composite channels to be formed with different bandwidths (e.g., 20 MHz, 40 MHz, 80 MHz) based on real-time channel conditions. The system can switch between fixed and variable bandwidth modes, enabling the communication channel to adapt its capacity according to available resources and interference levels, thereby resolving the contradiction between fixed allocation and flexible adaptation.
Solution Approach 2:
The invention changes the bandwidth parameter dynamically by modifying the channel width from fixed values to variable values. The system can adjust the bandwidth parameter based on channel quality, interference detection, and available spectrum, allowing optimization of data throughput while maintaining adaptability to different communication scenarios.
2Productivity
If fixed channel bandwidth is used, then system complexity is reduced, but communication efficiency is limited
Solution Approach 1:
The patent segments the available spectrum into multiple discrete channels (e.g., primary channel and secondary channels) that can be independently managed and combined. This segmentation allows the system to create composite channels with different bandwidths by selecting and combining appropriate segments, thereby achieving flexible bandwidth adjustment without requiring complete system redesign.
Solution Approach 2:
The system performs preliminary channel detection and classification before establishing communication, identifying suitable channels based on interference levels and availability. This preliminary action enables the system to pre-determine optimal bandwidth configurations, reducing the complexity of real-time decision-making while maintaining high communication efficiency.
3Productivity
If dynamic bandwidth adjustment is implemented, then data throughput is enhanced, but channel detection and measurement complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where receiving devices respond to bandwidth adjustments by confirming successful reception. The transmitting device uses these feedback signals to verify whether the adjusted bandwidth was properly detected and accepted, allowing iterative optimization of channel configuration while managing detection complexity through structured interaction protocols.
Solution Approach 2:
The system replaces complex manual channel measurement mechanisms with automated detection protocols embedded in the communication frames. Bandwidth information is encoded within control frames and acknowledged through standardized response protocols, substituting complex external measurement systems with integrated digital detection and verification mechanisms.
Data Source
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AI summary
In a method implemented in a first communication device, a control frame having a bandwidth is generated. The control frame is transmitted via a first composite communication channel, wherein the first composite communication channel comprises a plurality of communication channels. A bandwidth of a response frame, received from a second communication device in response to transmitting the control frame, is determined. A second composite communication channel based on the bandwidth of the response frame is determined, wherein the second composite communication channel comprises at least one communication channel from the plurality of communication channels. One or more data frames are transmitted to the second communication device via the second composite communication channel.