Multi-Band WLAN Trigger Frame Padding for Synchronization
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and require efficient data transmission methods that address synchronization issues across different frequency bands.
Innovation Solution
A method and apparatus for transmitting data in a WLAN system using a trigger frame configured for multi-band operation, where each band has a primary channel, and user information fields are aligned in length through the addition of padding bits, supporting uplink bandwidths up to 320 MHz and radio unit allocations across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If user information fields are transmitted with different lengths in each band, then the trigger frame can be optimized for each specific band, but synchronization problems occur across multi-band transmissions
Solution Approach 1:
The patent applies local quality by allowing different user information field configurations in different bands (2.4 GHz, 5 GHz, 6 GHz) while introducing padding bits to maintain overall synchronization. Each band can have optimized user information fields according to its specific requirements, but the padding ensures that all bands maintain the same total frame length for synchronized reception.
2Productivity
If multiple bands are aggregated for multi-band operation, then spectrum efficiency and area throughput are improved, but the complexity of managing different primary channels and user information fields increases
Solution Approach 1:
The patent segments the multi-band trigger frame into distinct components: a common information field that is identical across all bands and band-specific user information fields. This segmentation allows the system to manage complexity by separating common control information from band-specific configurations, making multi-band operation more tractable while maintaining high throughput.
Solution Approach 2:
The common information field serves as a universal component that all bands share, containing synchronization and control information that applies to all aggregated bands. This universal element simplifies multi-band management by providing a common reference point while allowing individual bands to have their own optimized user information fields.
3Reliability
If padding bits are added to align user information field lengths, then synchronization is maintained across bands, but the actual data transmission efficiency is reduced
Solution Approach 1:
The patent applies partial action by adding padding bits only where necessary to achieve synchronization, rather than uniformly padding all fields. The padding is applied selectively to user information fields in different bands to match the length of the longest field, ensuring synchronization while minimizing the impact on actual data transmission efficiency.
Data Source
AI summary
Proposed is a method and device for receiving data in a wireless LAN system. Specifically, an AP transmits a trigger frame to a first to a third station (STA) through a multi-band. The AP receives data from the first to third STAs on the basis of the trigger frame. In the multi-band, a first band to a third band are combined. The trigger frame includes a common information field and a first to a third user information field. When the first and second STAs are associated with the first band, the first user information field includes user information relating to the first and second STAs. When the second and third STAs are associated with the second band, the second user information field includes user information relating to the second and third STAs. When the third STA is associated with the third band, the third user information field includes user information relating to the third STA.