Radio Communication Apparatus Adaptive Channel Width Selection
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Solution Overview
Problem
In IEEE802.11n wireless LAN systems, the lack of a defined algorithm for generating and transmitting recommended channel width notification frames leads to inefficient channel resource usage and wasted transmission power due to inappropriate channel width selection, causing frame errors and interference from other systems or BSSs on the extension channel.
Innovation Solution
A radio communication apparatus with an interference detection device, frame generation unit, and frame transmission unit that detects interference and generates a notification frame recommending the use of a 20 MHz channel width to avoid channel width mismatches and frame errors, thereby optimizing channel usage and reducing power wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a 40 MHz channel width is used to increase transmission rate, then throughput is improved, but frame errors increase due to interference from other systems or BSSs on the extension channel
Solution Approach 1:
The patent implements dynamic channel width selection where the transmission channel width is adjusted based on real-time carrier sense results. The system can switch between 20 MHz and 40 MHz channel widths depending on whether interference is detected on the extension channel, making the channel configuration adaptive rather than fixed.
Solution Approach 2:
The patent changes the physical parameter of channel width based on channel conditions. By detecting carrier signals on the extension channel and adjusting the transmission channel width accordingly (20 MHz when interference detected, 40 MHz when clear), the system optimizes both throughput and reliability through parameter adaptation.
2Speed
If a 40 MHz channel width is used to extend communication band, then transmission rate is improved, but interference from other systems or BSSs on the extension channel increases
Solution Approach 1:
The patent performs preliminary carrier sense detection on the extension channel before initiating 40 MHz transmission. By checking for interfering signals in advance and notifying other terminals to avoid the extension channel, the system prevents interference problems before they occur, ensuring cleaner communication.
Solution Approach 2:
The patent implements a feedback mechanism where the carrier sense result is communicated to other terminals through notification frames. Other terminals receive feedback about the channel condition and adjust their transmissions accordingly, creating a coordinated system that reduces overall interference on the extension channel.
3Adaptability or versatility
If recommended channel width notification frames are transmitted without a defined algorithm, then channel width selection flexibility is improved, but channel resource usage efficiency deteriorates due to inappropriate channel width selection
Solution Approach 1:
The patent uses carrier sense feedback to determine the appropriate channel width to recommend. The notification frame content is based on actual channel conditions detected through carrier sense, ensuring that recommended channel widths are appropriate and lead to efficient resource usage rather than arbitrary selections.
Solution Approach 2:
The patent enables terminals to autonomously determine and notify appropriate channel widths based on their own carrier sense results. Each terminal independently assesses channel conditions and makes intelligent decisions about channel width recommendations, eliminating the need for centralized control while improving resource efficiency.
Data Source
AI summary
A radio communication apparatus that performs first radio communication using a first channel among two first channels each having a first channel width, and second radio communication using a second channel having a second channel width that is wider than the first channel width and also having a channel width overlapping with the two first channels. The apparatus includes an interference detection device which detects that interference occurs in the first channel among the two first channels, and a frame generation unit which generates a notification frame that recommends the use of only the first channel width. An instruction unit instructs the frame generation unit to generate the notification frame when the occurrence of interference is detected by the interference detection device. A frame transmission unit transmits the notification frame generated from the frame generation unit in response to the instruction from the instruction unit.