WLAN Selective Subchannel Transmission for 320 MHz RU Allocation
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Solution Overview
Problem
Existing technologies face challenges in efficiently allocating resource units (RUs) or multiple resource units (MRUs) in an Extremely High Throughput (EHT) physical layer protocol data unit (PPDU) with large bandwidth, such as 320 MHz, to maximize system throughput in IEEE 802.11be WLAN.
Innovation Solution
A method for selective subchannel transmission (SST) operation is introduced, allowing STAs and APs to negotiate and establish individual Target Wakeup Time (TWT) agreements using TWT elements to allocate RUs or MRUs efficiently across primary and secondary channels within a BSS, considering channel puncturing patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If maximum channel bandwidth is increased to 320 MHz to support higher throughput, then system throughput capacity is improved, but device complexity and resource allocation difficulty increase
Solution Approach 1:
The 320 MHz channel is segmented into multiple subchannels (e.g., two 160 MHz subchannels or four 80 MHz subchannels). The AP can selectively activate only the required subchannels based on STA capabilities and traffic demands, transforming a single complex wideband allocation problem into multiple simpler narrowband allocation problems that can be independently managed.
Solution Approach 2:
The patent implements dynamic subchannel allocation where the AP can flexibly configure and activate different subchannel combinations (e.g., 20 MHz, 40 MHz, 80 MHz, 160 MHz, or 320 MHz) based on real-time STA capabilities, channel conditions, and traffic requirements. This dynamic adaptability allows the system to optimize throughput while maintaining manageable allocation complexity.
2Productivity
If preamble puncturing is enabled for OFDMA transmissions to improve resource utilization, then spectral efficiency is improved, but signal processing complexity increases
Solution Approach 1:
The OFDMA preamble is segmented into multiple fields (L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, EHT-SIG, EHT-STF, EHT-LTF, data portion). Puncturing is selectively applied to specific segments (e.g., removing EHT-LTF or data portions in punctured RUs) while preserving critical synchronization and signaling fields, thereby improving spectral efficiency without overwhelming signal processing complexity.
Solution Approach 2:
Different preamble puncturing patterns are applied to different resource units based on local requirements. STAs with specific capabilities receive customized puncturing configurations (e.g., some STAs receive full preambles while others receive punctured versions), allowing spectral efficiency optimization at local levels without requiring complex global signal processing for all STAs.
3Productivity
If multiple resource units are allocated to a single STA to improve throughput, then data transmission efficiency is improved, but channel access fairness deteriorates
Solution Approach 1:
The AP dynamically adjusts resource unit allocation based on real-time STA performance metrics, channel conditions, and fairness requirements. The system can transition between allocating multiple RUs to a single high-priority STA and distributing RUs more evenly across multiple STAs, maintaining both transmission efficiency and fairness through adaptive resource management.
Solution Approach 2:
The patent modifies allocation parameters such as RU size, number of allocated RUs, and modulation and coding schemes based on STA capabilities and performance. By changing these parameters dynamically, the system can optimize for throughput when conditions permit while ensuring fair access when multiple STAs require service, resolving the contradiction between efficiency and fairness.
Data Source
Figure 1A~2A
Figure 2B~2C
Figure 2D~3B
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 target wake time (TWT) element of a TWT response to indicate a subchannel provided to a station (STA) as a temporary channel during a TWT service period (SP), wherein whether the subchannel is in a first channel or a second channel depends on a channel puncturing pattern of a basic service set (BSS) with which the STA is associated, 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 carried out by the STA as well as the AP and STA for SST operation in a WLAN.