WLAN Frame Structure for Multi-Channel Bonding
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Solution Overview
Problem
Current WLAN standards lack a defined frame structure for efficiently transmitting signals by bonding multiple channels, particularly for IEEE 802.11ay UEs with varying capabilities such as channel bonding and FFT sizes.
Innovation Solution
A method and device for determining a frame structure that includes direct current (DC) tones at the center of the bandwidth and additional DC tones spaced apart, allowing for efficient signal transmission and reception between stations with different capabilities by bonding multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frame structure for bonding multiple channels is defined, then channel bonding capability is improved, but device complexity increases due to varying UE capabilities
Solution Approach 1:
The patent segments the frequency spectrum into multiple channels that can be bonded together. Each channel is treated as an independent unit with its own DC tone positioning, allowing UEs to bond channels according to their capabilities while maintaining a standardized frame structure. This segmentation enables flexible channel bonding without requiring complete redesign of the frame structure for each UE capability level.
Solution Approach 2:
The patent creates a universal frame structure that can accommodate multiple UE capabilities simultaneously. By defining DC tones at specific frequency positions (center of bandwidth and spaced apart at certain intervals), the same frame structure serves both UEs with limited channel bonding capability and UEs with advanced capabilities, eliminating the need for capability-specific frame designs.
2Productivity
If DC tones are positioned at the center of bandwidth for bonded channels, then signal transmission efficiency is improved, but interference between channels increases
Solution Approach 1:
The patent introduces additional DC tones spaced apart from the center DC tones as intermediary elements. These additional DC tones act as guard tones or spacing elements between bonded channels, reducing spectral leakage and interference while preserving the efficiency benefits of center-positioned DC tones for each individual channel.
Solution Approach 2:
The patent applies different DC tone positioning strategies to different parts of the frequency spectrum. Center DC tones are positioned at the center of each bonded channel for efficiency, while additional DC tones are positioned at spaced-apart intervals to provide local interference protection. This local differentiation optimizes both transmission efficiency and interference mitigation.
Data Source
AI summary
The present invention relates to a method for transmitting and receiving, by a station, signals in a wireless WLAN system. More particularly, the present specification proposes a frame structure for transmitting signals by bonding a plurality of channels by the station, and a method for transmitting and receiving signals on the basis of the same frame structure, and an apparatus therefor.