Downsized Trigger-Based PPDU Encoding and Power Control in WLAN
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems lack defined encoding and transmit power control for downsized trigger-based physical-layer protocol data unit (PPDU) transmissions, particularly in scenarios where partial bandwidth is available, leading to inefficiencies in spectral efficiency.
Innovation Solution
Implement encoding and transmit power control schemes that allow for downsized RU/MRU transmissions by aligning parameters such as modulation coding scheme, number of symbols, and packet extension, while replacing RU Allocation information with Downsized RU/MRU Allocation information in the encoding process, and adjusting transmit power based on the ratio of allocated to downsized RU/MRU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a STA performs downsized RU/MRU transmission when partial bandwidth is busy, then spectral efficiency is improved, but encoding and transmit power control mechanisms are undefined leading to implementation complexity
Solution Approach 1:
The patent applies parameter changes by modifying the RU allocation information in trigger frames to indicate downsized RU/MRU configurations. When partial bandwidth is busy, the system changes the transmission parameters (RU size, tone allocation) while maintaining backward compatibility with existing WLAN standards. This allows flexible adaptation to channel conditions without requiring completely new encoding schemes.
Solution Approach 2:
The patent segments the available bandwidth into smaller RU/MRU units that can be selectively activated based on channel availability. Instead of treating the entire bandwidth as a single unit, the system divides it into manageable segments (26-tone, 52-tone, 106-tone, 242-tone RUs) that can be independently allocated and transmitted, enabling partial bandwidth utilization when some subchannels are busy.
2Adaptability or versatility
If traditional RU allocation is used in trigger frames, then compatibility with existing WLAN standards is maintained, but flexibility to adapt to partially busy channels is lost
Solution Approach 1:
The patent introduces dynamic RU allocation where the RU size and tone assignment in trigger frames can be adjusted based on real-time channel conditions. The system dynamically selects appropriate RU configurations (full size or downsized) and updates the allocation information in trigger frames accordingly, allowing the network to adapt to varying channel availability while maintaining operational reliability.
Solution Approach 2:
The patent embeds downsized RU/MRU allocation information within the existing trigger frame structure used in IEEE 802.11ax/be standards. The new allocation mechanisms are nested within the conventional trigger frame format, allowing the system to incorporate advanced partial bandwidth utilization features while maintaining compatibility with existing WLAN infrastructure and devices.
Data Source
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AI summary
Various schemes pertaining to encoding and transmit power control for downsized trigger-based, TB, physical-layer protocol data unit, PPDU, transmissions in next-generation WLAN systems are described. A station, STA, receives a trigger frame indicating an allocated resource unit, RU, of a first size (1010). The STA performs channel sensing responsive to receiving the trigger frame (1020). In response to detecting at least one subchannel being busy from the channel sensing, the STA performs a downsized trigger-based, TB, transmission with a downsized RU or multi-RU, MRU, of a second size smaller than the first size by utilizing downsized RU or MRU allocation information while maintaining a value of each of one or more parameters unchanged in an encoding process to perform the downsized TB transmission (1030).