CTS Channel Selection Using MRUs to Reduce WLAN Interference
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Solution Overview
Problem
In wireless local area networks (WLAN), the transmission of clear-to-send (CTS) frames can cause unnecessary channel occupation and interference due to mismatched resource allocation, leading to inefficient use of bandwidth.
Innovation Solution
The proposed method involves transmitting CTS frames using preconfigured multiple resource units (MRUs) based on bandwidth information, ensuring that the transmission resources match the actual PPDU resources, thereby preventing unnecessary channel occupation and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CTS frame is transmitted using fixed resource allocation, then transmission protocol simplicity is maintained, but channel occupation efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the CTS frame transmission resource adjustable rather than fixed. The receiving STA determines the transport channel dynamically based on the actual PPDU transmission resource and CCA result, allowing the system to adapt to different bandwidth conditions and optimize channel occupation efficiency while maintaining manageable complexity through predefined MRU sets.
Solution Approach 2:
The patent changes the parameter of transmission resource allocation by introducing bandwidth information as a variable parameter. The CTS frame transmission resource is adjusted according to the actual PPDU bandwidth and CCA results, enabling efficient channel utilization across different bandwidth conditions without requiring completely new allocation mechanisms.
2Object-affected harmful factors
If CTS frame is transmitted with mismatched resources, then transmission speed is maintained, but channel interference increases
Solution Approach 1:
The patent implements feedback by having the receiving STA perform CCA based on bandwidth information and use the CCA result to determine the transport channel for CTS transmission. This feedback mechanism ensures that the CTS frame is transmitted on the actual used resource rather than a fixed resource, preventing channel interference while maintaining transmission speed through efficient resource matching.
3Loss of energy
If CTS frame uses preconfigured MRUs, then bandwidth efficiency is improved, but determination complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the resource allocation into predefined multiple resource units (MRUs) that are configured in advance. The receiving STA selects from these presegmented MRUs based on the actual PPDU resource and CCA result, which simplifies the determination process compared to dynamic resource negotiation while maintaining high bandwidth efficiency through precise resource matching.
Data Source
AI summary
In a Wireless Local Area Network system, a reception STA can receive a request to send (RTS) frame. The RTS frame may include bandwidth information. The reception STA can perform clear channel assessment (CCA) on the basis of the bandwidth information. The reception STA can determine a transmission channel on the basis of the result of the CCA and information about preset multiple resource units (MRUs). The reception STA can transmit a clear to send (CTS) frame through the transmission channel. The transmission channel is one of the preset MRUs and may be a channel in which the CCA result is idle. The preset MRUs may include a first MRU composed of a first 996 tone RU, a second 996 tone RU, a third 996 tone RU, and a 484 tone RU.