WLAN Sensing PPDU Parameter Control for Consistent CSI Measurement
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Solution Overview
Problem
Existing WLAN devices lack standardized interfaces for obtaining Channel State Information (CSI) for high-layer applications, limiting their capability to perform high-resolution sensing across different 802.11 device amendments, and existing solutions restrict transmission parameters based on the lowest common capabilities, which can lead to inconsistent channel measurements and errors.
Innovation Solution
Implement a communication apparatus and method that enables channel measurements by transmitting request frames with specified transmission parameters, allowing devices to perform channel measurements based on received PPDUs, and providing an interface to pass results to higher-layer applications, supporting both solicited and unsolicited channel measurement modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If WLAN sensing is implemented across different 802.11 device amendments (HT, VHT, HE, DMG, EDMG), then device compatibility and versatility are improved, but measurement precision and consistency deteriorate due to varying device capabilities and lack of standardized interfaces
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting transmission parameters (such as bandwidth, subcarrier spacing, cyclic prefix length) based on the capability indicators exchanged between devices. This allows the system to adapt to different 802.11 amendments while maintaining consistent measurement quality by optimizing parameters for each device pair's capabilities.
Solution Approach 2:
The patent introduces capability indicators as an intermediary mechanism that mediates between devices of different amendments. These indicators convey device capabilities to the sensing initiator, which then uses this information to configure appropriate transmission parameters, ensuring consistent measurements across heterogeneous devices without requiring all devices to support the latest amendment.
2Measurement precision
If standardized interfaces are implemented for CSI access and parameter configuration, then measurement precision is improved, but device complexity increases due to additional protocol layers and configuration mechanisms
Solution Approach 1:
The patent applies universality by designing a standardized sensing interface that can serve multiple 802.11 amendments (HT, VHT, HE, DMG, EDMG) through a common capability indicator framework. This single standardized interface handles diverse device types by encoding their capabilities in a universal format, avoiding the need for separate interfaces for each amendment and thus limiting complexity increase.
Solution Approach 2:
The standardized interface uses parameter changes to convey device capabilities through capability indicators that specify supported amendments and features. This allows the interface to adapt to different device complexities without requiring fundamentally different interface designs, maintaining relative simplicity while achieving precise measurements.
3Ease of manufacture
If legacy 802.11 devices are updated with firmware/software to support 802.11bf, then ease of manufacture is improved, but reliability may worsen due to potential errors in channel measurements from mixed-capability devices
Solution Approach 1:
The patent applies preliminary action by having devices exchange capability indicators before performing channel measurements. This preliminary exchange allows the sensing initiator to configure appropriate transmission parameters in advance, ensuring reliable measurements even when devices have different capabilities (some updated with 802.11bf, others legacy). The capability assessment happens beforehand, preventing measurement errors.
Solution Approach 2:
The patent implements feedback through the capability indicator mechanism, where devices provide information about their capabilities to the sensing initiator. This feedback loop allows the system to adjust transmission parameters based on actual device capabilities, ensuring reliable measurements across mixed environments without requiring all devices to be uniformly updated.
Data Source
AI summary
The present disclosure provides a communication apparatus and method for wireless local area network sensing. The communication apparatus comprises: a transmitter, which, in operation, transmits a request frame to one or more peer communication apparatuses, the request frame carrying transmission parameters to be used by the each of one or more peer communication apparatuses to transmit a physical layer protocol data unit (PPDU) used for channel measurements; a sensing module configured to perform the channel measurements based on the respective PPDU(s) received from the one or more peer communication apparatuses; and an interface configured to obtain sensing parameters from higher layer applications and pass a result of the channel measurements to the higher layer applications.