Aggregated PPDU Channel Sounding for Multi-Protocol WLAN Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in channel sounding, particularly when dealing with devices supporting different protocol standards, which can lead to suboptimal beamforming and communication performance.
Innovation Solution
The method involves generating an aggregated physical layer protocol data unit (PPDU) with null data packets (NDPs) based on different protocol standards, ensuring they have the same duration and are transmitted in different frequency bands, allowing for simultaneous channel sounding across various protocol standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate channel sounding is performed for different protocol standards, then compatibility with legacy devices is maintained, but channel sounding efficiency deteriorates due to sequential processing
Solution Approach 1:
The patent combines multiple NDPs for different protocol standards (802.11ax and 802.11be) into a single aggregated PPDU structure. This allows the access point to transmit channel sounding signals for multiple protocols simultaneously in one transmission opportunity, eliminating the need for sequential separate transmissions and thereby improving channel sounding efficiency while maintaining compatibility with devices supporting different protocol standards.
Solution Approach 2:
The aggregated PPDU structure serves multiple functions by incorporating NDPs for different protocol standards within a single transmission frame. This multi-functional design enables the system to perform channel sounding for both 802.11ax and 802.11be devices simultaneously, making the transmission mechanism universally applicable to multiple protocol versions without requiring separate dedicated transmission procedures for each standard.
2Device complexity
If channel sounding is performed sequentially for different protocol standards, then processing complexity is reduced, but time consumption increases
Solution Approach 1:
The patent merges multiple channel sounding operations for different protocol standards into a single aggregated transmission. By combining the NDPs for 802.11ax and 802.11be into one PPDU, the system performs what would otherwise be sequential operations in parallel, significantly reducing the total time required for channel sounding while managing processing complexity through a standardized aggregation framework.
3Productivity
If aggregated PPDU with multiple NDPs is transmitted, then channel sounding efficiency is improved, but signal structure complexity increases
Solution Approach 1:
The aggregated PPDU is segmented into distinct components, with each NDP clearly structured according to its respective protocol standard (802.11ax or 802.11be). This segmentation allows receiving devices to identify and process only the NDPs relevant to their supported protocols, managing signal structure complexity through clear delimitation and organization of different protocol elements within the aggregated frame.
Solution Approach 2:
Different portions of the aggregated PPDU are optimized for specific protocol requirements. Each NDP within the aggregation maintains its protocol-specific characteristics and structure, allowing devices to process only the locally relevant portion according to their capabilities. This local quality approach enables efficient processing without requiring devices to handle the entire aggregated structure in full detail.
Data Source
AI summary
The present disclosure provides a wireless communication method. The wireless communication method includes a first apparatus communicating with at least one second apparatus in a wireless local area network (WLAN) system. The wireless communication method generates an aggregated physical layer protocol data unit (PPDU) including a first null data packet (NDP) based on a first protocol standard and a second NDP based on a second protocol standard and transmits the aggregated PPDU to the at least one second apparatus, wherein the first NDP and the second NDP have a same duration in different frequency bands.