Selective Subchannel Transmission in WLANs
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Solution Overview
Problem
There is an open issue in efficiently allocating resource units or multiple resource units in an Extremely High Throughput (EHT) Physical Layer Protocol Data Unit (PPDU) with large bandwidth, such as 320 MHz, in Wireless Local Area Networks (WLANs, particularly in IEEE 802.11be EHT WLANs, to maximize system throughput.
Innovation Solution
The method involves setting a first Time-Wait (TWT) element in a TWT response to indicate at least one guaranteed non-punctured 20 MHz channel in a subchannel provided to a Station (STA) as a temporary channel during a TWT Scheduled Period (SP), allowing for efficient resource allocation by aligning or not aligning the puncturing pattern with the operating channel's pattern, depending on the SST operation mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel bandwidth is increased to 320 MHz to support higher throughput, then system throughput is improved, but resource unit allocation complexity increases
Solution Approach 1:
The patent segments the wide bandwidth channel into multiple subchannels (e.g., 20 MHz channels) and allocates resource units independently within each subchannel. This segmentation approach allows the system to maintain high throughput by utilizing the full 320 MHz bandwidth while reducing allocation complexity by treating each subchannel as an independent unit that can be managed separately, thus resolving the contradiction between high throughput and allocation complexity.
2Productivity
If preamble puncturing is enabled for OFDMA transmissions to improve resource allocation flexibility, then resource allocation efficiency is improved, but signal processing complexity increases
Solution Approach 1:
The patent implements dynamic puncturing patterns where certain subchannels or resource units are selectively punctured (skipped) in the preamble based on allocation requirements. This dynamic approach allows the system to adapt the preamble structure to match the actual resource allocation, improving efficiency by avoiding unnecessary signaling for unpunctured channels while keeping processing complexity manageable through standardized puncturing rules.
3Productivity
If multiple resource units are allocated to a single STA to improve spectral efficiency, then spectral efficiency is improved, but channel estimation difficulty increases
Solution Approach 1:
The patent allocates multiple resource units to a single STA within the same subchannel, ensuring that the channel conditions are relatively homogeneous across these units. This local quality approach simplifies channel estimation because the STA can use reference signals from one resource unit to estimate channels for other units in the same subchannel, reducing estimation difficulty while maintaining high spectral efficiency through MRU allocation.
Data Source
AI summary
Embodiments of the invention provide methods and devices for selective subchannel transmission (SST) operation in a WLAN. The method carried out by an access point (AP) comprises: setting, by the AP, a first target wake time (TWT) element of a TWT response to indicate at least one guaranteed non-punctured 20 MHz channel in a subchannel provided to a station (STA) as a temporary channel during a TWT service period (SP), and sending, by the AP, the TWT response to the STA to establish an individual TWT agreement between the AP and the STA. Embodiments of the invention also provide the method for SST operation in a WLAN carried out by the STA as well as the AP and STA for SST operation in a WLAN.