CCA Section Segmentation for Mixed Wireless LAN Compatibility
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Solution Overview
Problem
In IEEE 802.11ax wireless LAN systems, new terminal devices using a higher CCA level for improved communication opportunities hinder existing terminal devices using the legacy CCA level, leading to reduced communication opportunities and degraded reception quality for legacy devices.
Innovation Solution
Implementing a communication system where a radio transmission device signals distinct CCA sections to a radio reception device, allowing carrier sense based on different CCA levels within these sections, ensuring both new and existing devices can communicate effectively by separating CCA levels into dynamic and legacy sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If new terminal devices use a higher CCA level for carrier sense, then communication opportunities for new devices are improved, but communication opportunities for existing terminal devices are reduced
Solution Approach 1:
The patent divides the carrier sense mechanism into two distinct sections: a first CCA section using a first CCA level for new terminal devices, and a second CCA section using a second CCA level for existing terminal devices. This segmentation allows each device type to operate with optimized CCA levels appropriate to their capabilities, resolving the contradiction between improving new device performance and maintaining legacy device compatibility
Solution Approach 2:
The patent applies different CCA levels to different terminal devices based on their specific capabilities. New terminal devices use a higher first CCA level that allows more aggressive channel access, while existing terminal devices use a lower second CCA level that ensures backward compatibility. This local differentiation of quality parameters enables each device type to achieve optimal performance without interfering with the other
2Productivity
If the CCA level is increased to allow more interference and improve communication opportunities, then communication opportunities are improved, but reception quality degrades
Solution Approach 1:
The patent changes the CCA level parameter differently for different device types and time periods. By introducing a higher first CCA level for new terminal devices during specific operations, the system allows more interference to be tolerated, thereby improving communication opportunities. The lower second CCA level is maintained for existing devices to ensure stable reception quality. This dynamic parameter adjustment resolves the contradiction between improving productivity and maintaining reliability
Data Source
AI summary
Communication opportunities of existing terminal devices are ensured, in a communication system in which terminal devices capable of using a new CCA level and the existing terminal devices using an existing CCA level coexist, on the premise of CSMA/CA. A communication method of a radio transmission device of the present invention includes a step of signaling information indicating a first CCA section and a second CCA section to the radio reception device. A communication method of a radio reception device of the present invention includes a step of performing the carrier sense based on a first CCA level and a second CCA level, and a step of performing the carrier sense based on the first CCA level, in the first CCA section, based on information indicating the first CCA section.